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Apple Watch Series 4 40mm Review | 126 Data compared

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  • Avg. price: ~£160
  • Screen size: 1.57 inch
  • Battery life: 0.75 day/s
  • Display type: OLED

Apple Watch Series 4 40mm review. Compare 126 technical specifications and user reviews to see how it ranks among smartwatches and if it is worth buying.

7.2

Overall score

What it is: An overall evaluation of the smartwatch's quality, based on technical analyses and user reviews.

When it matters: When you need a quick reference to identify the best Smartwatches on the market.

Score components:

90.0%

7.2

Technical Score

10.0%

7.0

User score

Very good
7.2

Technical Score

What it is: An assessment of the smartwatch's technical performance, covering eight key areas: performance & hardware, software, camera, connectivity, display, battery, audio, and design.

When it matters: When you want to compare Smartwatches based on technical performance and available features.

Score components:

24.0%

6.0

Health

21.0%

9.9

Fitness

16.0%

3.5

Battery

14.0%

8.6

Smart features

12.0%

8.8

Connectivity

9.0%

7.2

Display & Design

4.0%

6.7

Hardware

Very good
7.0

User score

What it is: A rating that combines user reviews and the total number of reviews received by the smartwatch

When it matters: When you want to know how a smartwatch handles daily tasks and how reliable it remains over time according to user feedback.

Score components:

70.0%

7.7

User reviews

30.0%

5.4

Popularity

User score:
amazon
3.5
(84)
amazon
4.7
(52)
amazon
3.3
(26)

(Reviews last updated: Apr 2026)

Very good
    • apple-watch-series-4-40mm
    • apple-watch-series-4-40mm
    apple-watch-series-4-40mm
    apple-watch-series-4-40mm

    Best prices

    Best rankings

    ?

    Available: ranking among products currently available (including other versions of this product).
    All: ranking among all products in the database.

    Technical Specifications of smartwatch Apple Watch Series 4 40mm

    Technical Score

    What it is: An assessment of the smartwatch's technical performance, covering eight key areas: performance & hardware, software, camera, connectivity, display, battery, audio, and design.

    When it matters: When you want to compare Smartwatches based on technical performance and available features.

    Score components:

    24.0%

    6.0

    Health

    21.0%

    9.9

    Fitness

    16.0%

    3.5

    Battery

    14.0%

    8.6

    Smart features

    12.0%

    8.8

    Connectivity

    9.0%

    7.2

    Display & Design

    4.0%

    6.7

    Hardware

    7.2
    Apple Watch Series 4 40mm has a technical score of 7.24 points, which is higher than 73% of smartwatches.
    User score

    What it is: A rating that combines user reviews and the total number of reviews received by the smartwatch

    When it matters: When you want to know how a smartwatch handles daily tasks and how reliable it remains over time according to user feedback.

    Score components:

    70.0%

    7.7

    User reviews

    30.0%

    5.4

    Popularity

    User score:
    amazon
    3.5
    (84)
    amazon
    4.7
    (52)
    amazon
    3.3
    (26)

    (Reviews last updated: Apr 2026)

    7.0
    Apple Watch Series 4 40mm has a user score of 7.01 points, which is lower than 83.5% of smartwatches.
    Popularity
    What it is: An indicator based on the number of reviews received by the smartwatch.
    When it matters: When you prefer to purchase a product chosen and reviewed by many other consumers.
    5.4
    Apple Watch Series 4 40mm has a popularity of 5.4 points, which is higher than 61.3% of smartphones.
    Ratio quality/price

    What it is: An indicator that combines the smartwatch's overall rating with its cost.

    When it matters: When you are looking for a smartwatch with a good balance between quality and price.

    Score components:

    60.0%

    7.2

    Overall score

    40.0%

    9.7

    Price

    8.0
    Apple Watch Series 4 40mm has a quality-to-price ratio of 8 points, which is higher than 75.1% of smartphones.
    Brand name
    What it is: The company that designs, sells, and supports the watch.
    When it matters: When brand ecosystem, style, or support matters to you.

    Importance: MEDIUM

    Apple
    Heart rate monitor
    What it is: A built-in sensor that measures your pulse directly from the wrist.
    When it matters: When you want health data from your wrist during the day or night.

    Importance: HIGH

    yes
    Apple Watch Series 4 40mm includes a heart rate monitor. 90.4% of smartwatches include a heart rate monitor.
    Blood oxygen monitoring
    What it is: A wrist-based feature that estimates blood oxygen saturation over time.
    When it matters: When you want health data from your wrist during the day or night.

    Importance: HIGH

    no
    Apple Watch Series 4 40mm does not support blood oxygen monitoring. 64.4% of smartwatches support blood oxygen monitoring.
    ECG
    What it is: The ability to record a single-lead electrocardiogram from the wrist.
    When it matters: When you want health data from your wrist during the day or night.

    Importance: HIGH

    yes
    Apple Watch Series 4 40mm supports ECG. 15.1% of smartwatches support ECG.
    Irregular heart rate warnings
    What it is: Notifications that flag heart-rate patterns which appear unusually irregular.
    When it matters: When you want health data from your wrist during the day or night.

    Importance: MEDIUM

    yes
    Apple Watch Series 4 40mm supports irregular heart rate warnings. 43.7% of smartwatches support irregular heart rate warnings.
    Show more
    Accelerometer
    What it is: A motion sensor that measures acceleration, steps, gestures, and general movement.
    When it matters: When you track workouts and want better training data.

    Importance: MEDIUM

    yes
    Apple Watch Series 4 40mm includes an accelerometer. 99.1% of smartwatches include an accelerometer.
    Barometer
    What it is: A pressure sensor used for altitude changes, elevation estimates, and weather-related context.
    When it matters: When you run, ride, hike, or navigate without relying on your phone.

    Importance: MEDIUM

    yes
    Apple Watch Series 4 40mm includes a barometer. 45.6% of smartwatches include a barometer.
    Gyroscope
    What it is: A motion sensor that measures rotation and helps interpret wrist movement more accurately.
    When it matters: When you track workouts and want better training data.

    Importance: MEDIUM

    yes
    Apple Watch Series 4 40mm includes a gyroscope. 64.6% of smartwatches include a gyroscope.
    Cadence sensor
    What it is: A sensor input used to measure step or pedal rhythm during training.
    When it matters: When you track workouts and want better training data.

    Importance: MEDIUM

    yes
    Apple Watch Series 4 40mm includes a cadence sensor. 20.1% of smartwatches include a cadence sensor.
    Cadence may require external sensor/app pairing on some models.
    Distance tracking
    What it is: The ability to measure how far you move during walks, runs, rides, or other activities.
    When it matters: When you track workouts and want better training data.

    Importance: MEDIUM

    yes
    Apple Watch Series 4 40mm supports distance tracking. 95.7% of smartwatches support distance tracking.
    Show more
    Battery life
    What it is: The typical endurance the watch can deliver on a full charge under the stated usage pattern.
    When it matters: When you do not want to charge the watch too often.

    Importance: HIGH

    Good value: >=7 days

    0.75 day/s
    Apple Watch Series 4 40mm offers a battery life of 0.75 day/s which is shorter than that of 98% of smartwatches and equal to that of 2% of smartwatches.
    Battery life in training mode
    What it is: The expected endurance while workout tracking and related training functions are active.
    When it matters: When you do not want to charge the watch too often.

    Importance: HIGH

    Good value: >=36.8 h

    5.5 h
    Apple Watch Series 4 40mm lasts 5.5 h in training mode which is shorter than 90% of smartwatches and equal to that of 0.5% of smartwatches.
    Battery life with GPS on
    What it is: The expected runtime when satellite tracking stays active throughout use.
    When it matters: When you do not want to charge the watch too often.

    Importance: HIGH

    Good value: >=35 h

    6 h
    Apple Watch Series 4 40mm lasts 6 h with GPS on which is shorter than 87% of smartwatches and equal to that of 2.8% of smartwatches.
    Battery power
    What it is: The battery capacity, usually measured in milliampere-hours (mAh).
    When it matters: When you do not want to charge the watch too often.

    Importance: HIGH

    Good value: >=397 mAh

    258 mAh
    Apple Watch Series 4 40mm has a battery capacity of 258 mAh which is smaller than the batteries in 69.2% of smartwatches of smartwatches.
    Charge time
    What it is: The time needed to recharge the battery from empty to full or to a stated percentage.
    When it matters: When you want to top up the battery quickly.

    Importance: HIGH

    Good value: <=102 min

    120 min
    Apple Watch Series 4 40mm charges in 120 min which is faster than 12.9% of smartwatches and equal to the charge time of 43.4% of smartwatches.
    Show more
    Operating system
    What it is: The software platform that runs the watch interface, apps, and core functions.
    When it matters: When you care about apps, features, and long-term support.

    Importance: HIGH

    watchOS
    Apple Watch Series 4 40mm runs watchOS which is more advanced than the operating system in 95.7% of smartwatches and the same as that in 4.3% of smartwatches.
    OS detail: watchOS (10.6).
    Software update frequency
    What it is: Shows how actively the watch is still updated: regular means ongoing updates throughout active support, occasional means updates every few months or only from time to time, and ended means active software support has mostly stopped.
    When it matters: When you care how actively the watch is still supported with fixes, patches, and new features.

    Importance: MEDIUM

    ended
    Apple Watch Series 4 40mm has ended software update support which is equal to that of 57.5% of smartwatches.
    Software support appears ended or discontinued.
    Third-party app support
    What it is: Support for installing or using apps from developers beyond the watch maker.
    When it matters: When you care about apps, features, and long-term support.

    Importance: MEDIUM

    yes
    Apple Watch Series 4 40mm supports third-party apps. 47.6% of smartwatches support third-party apps.
    Notifications
    What it is: Mirroring of calls, messages, apps, or other alerts on the watch.
    When it matters: When you want to check alerts without taking out your phone.

    Importance: MEDIUM

    yes
    Apple Watch Series 4 40mm supports notifications. 99.9% of smartwatches support notifications.
    Voice assistant support
    What it is: Support for a voice assistant that can answer queries or trigger actions from the wrist.
    When it matters: When you want to control the watch or reply without typing.

    Importance: MEDIUM

    yes
    Apple Watch Series 4 40mm supports voice assistants. 68% of smartwatches support voice assistants.
    Show more
    Cellular module
    What it is: Built-in mobile connectivity that can keep the watch online away from the phone.
    When it matters: When you want calls, messages, or data without your phone nearby.

    Importance: HIGH

    yes
    Apple Watch Series 4 40mm includes a cellular module. 17.2% of smartwatches include a cellular module.
    Cellular support may depend on LTE/GPS+Cellular variant selection.
    SIM cards
    What it is: The number or type of SIM options the watch accepts for cellular service.
    When it matters: When you want calls, messages, or data without your phone nearby.

    Importance: LOW

    Good value: eSIM support

    ?
    GPS
    What it is: Built-in satellite positioning that lets the watch record location during outdoor activity.
    When it matters: When you run, ride, hike, or navigate without relying on your phone.

    Importance: HIGH

    yes
    Apple Watch Series 4 40mm supports GPS. 56.1% of smartwatches support GPS.
    Galileo support
    What it is: Support for Galileo satellites alongside other positioning systems.
    When it matters: When you run, ride, hike, or navigate without relying on your phone.

    Importance: MEDIUM

    yes
    Apple Watch Series 4 40mm supports Galileo navigation. 38.7% of smartwatches support Galileo navigation.
    Compass
    What it is: A directional sensor that helps the watch determine heading and orientation.
    When it matters: When you run, ride, hike, or navigate without relying on your phone.

    Importance: MEDIUM

    yes
    Apple Watch Series 4 40mm includes a compass. 49.3% of smartwatches include a compass.
    Show more
    Screen size
    What it is: The diagonal measurement of the visible display area, usually expressed in inches.
    When it matters: When you want the screen to be easy to read at a glance.

    Importance: HIGH

    Good value: >=1.5 inch

    1.57 inch
    Apple Watch Series 4 40mm has a screen size of 1.57 inch which is larger than the screens of 73% of smartwatches and equal to those of 1.1% of smartwatches.
    Some sources mention multiple/uncertain size variants.
    Display type
    What it is: The screen technology used by the watch, such as AMOLED, OLED, or memory-in-pixel LCD.
    When it matters: When you want the screen to be easy to read at a glance.

    Importance: HIGH

    OLED
    Apple Watch Series 4 40mm uses a OLED display type which is less advanced than that of 51.4% of smartwatches and the same as that of 9.7% of smartwatches.
    Retina branding. LTPO panel wording.
    Resolution
    What it is: The total number of pixels available on the watch display.
    When it matters: When you want the screen to be easy to read at a glance.

    Importance: MEDIUM

    Good value: >=416 x 416

    324 x 394
    Apple Watch Series 4 40mm has a display resolution of 324 x 394 which is lower than that of 52.7% of smartwatches and equal to that of 0.7% of smartwatches.
    Pixel density
    What it is: The number of pixels packed into each inch of the display.
    When it matters: When you want the screen to be easy to read at a glance.

    Importance: MEDIUM

    Good value: >=326 ppi

    325 ppi
    Apple Watch Series 4 40mm has a pixel density of 325 ppi which is lower than that of 53.8% of smartwatches and equal to that of 1% of smartwatches.
    Display brightness
    What it is: The peak brightness the display can reach, usually expressed in nits.
    When it matters: When you want the screen to stay readable outdoors and in strong sunlight.

    Importance: HIGH

    Good value: >=1000 nits

    1,000 nits
    Apple Watch Series 4 40mm reaches 1000 nits nits of display brightness, which is higher than that of 59.5% of smartwatches and equal to that of 26.5% of smartwatches.
    Show more
    CPU speed
    What it is: The clock speed of the watch processor, usually expressed in GHz or MHz.
    When it matters: When you want apps and menus to feel smooth.

    Importance: MEDIUM

    Good value: Modern standard

    2 x 1.5 GHz
    Apple Watch Series 4 40mm uses a CPU configuration of 2 x 1.5 GHz which is faster than that in 77.2% of smartwatches and equal to that in 1.2% of smartwatches.
    Processor model
    What it is: The processor model is the chipset or SoC that powers the watch's performance, connectivity, and efficiency.
    When it matters: When you care about app responsiveness, platform generation, and long-term feature support.

    Importance: LOW

    Good value: modern smartwatch chipset

    Apple S4
    Apple Watch Series 4 40mm uses the Apple S4 processor model.
    RAM
    What it is: The amount of working memory available for apps, watch faces, and background tasks.
    When it matters: When you want apps and menus to feel smooth.

    Importance: MEDIUM

    Good value: >=1 GB

    1 GB
    Apple Watch Series 4 40mm has 1 GB of RAM which is larger than the RAM in 32.3% of smartwatches and equal to that of 34.6% of smartwatches.
    Internal storage
    What it is: Built-in storage for apps, music, watch faces, and other local data.
    When it matters: When you want more room for apps, music, or offline data.

    Importance: MEDIUM

    Good value: >=8 GB

    16 GB
    Apple Watch Series 4 40mm uses 16 GB for internal storage which is larger than that of 79.9% of smartwatches and equal to that of 4.7% of smartwatches.
    External memory slot
    What it is: A slot for expandable storage such as a memory card, if the watch provides one.
    When it matters: When you want more room for apps, music, or offline data.

    Importance: LOW

    no
    Apple Watch Series 4 40mm does not include an external memory slot. 0.3% of smartwatches include an external memory slot.
    Show more

    Apple Watch Series 4 40mm vs the average smartwatch

    • Has cellular module
      Apple Watch Series 440mm includes a cellular module, the average smartwatch does not. 17.2% of smartwatches include a cellular module.
      Cellular support may depend on LTE/GPS+Cellular variant selection.
      What it is: Built-in mobile connectivity that can keep the watch online away from the phone.
      When it matters: When you want calls, messages, or data without your phone nearby.

      Importance: HIGH

      Apple Watch Series 440mm includes a cellular module, the average smartwatch does not. 17.2% of smartwatches include a cellular module.
    • Has ECG
      Apple Watch Series 440mm supports ECG, the average smartwatch does not. 15.1% of smartwatches support ECG.
      What it is: The ability to record a single-lead electrocardiogram from the wrist.
      When it matters: When you want health data from your wrist during the day or night.

      Importance: HIGH

      Apple Watch Series 440mm supports ECG, the average smartwatch does not. 15.1% of smartwatches support ECG.
    • More advanced operating system
      Apple Watch Series 440mm runs a more advanced operating system than the average smartwatch (watchOS vs Proprietary OS).
      OS detail: watchOS (10.6).
      What it is: The software platform that runs the watch interface, apps, and core functions.
      When it matters: When you care about apps, features, and long-term support.

      Importance: HIGH

      Apple Watch Series 440mm runs a more advanced operating system than the average smartwatch (watchOS vs Proprietary OS).watchOS vs Proprietary OS
    • Includes fall detection
      Apple Watch Series 440mm supports fall detection, the average smartwatch does not. 22.4% of smartwatches support fall detection.
      What it is: Automatic detection of hard falls that can trigger checks or emergency actions.
      When it matters: When you want extra help in an emergency.

      Importance: HIGH

      Apple Watch Series 440mm supports fall detection, the average smartwatch does not. 22.4% of smartwatches support fall detection.
    • Includes wireless charging
      Apple Watch Series 440mm supports wireless charging, the average smartwatch does not. 24.9% of smartwatches support wireless charging.
      Wireless charging supported via proprietary charging puck/dock.
      What it is: Support for recharging the watch through a charging pad, puck, or other cable-free method.
      When it matters: When you want to top up the battery quickly.

      Importance: MEDIUM

      Apple Watch Series 440mm supports wireless charging, the average smartwatch does not. 24.9% of smartwatches support wireless charging.
    • Has NFC
      Apple Watch Series 440mm supports NFC, the average smartwatch does not. 42.5% of smartwatches support NFC.
      What it is: Near-field communication hardware used for payments, pairing, or quick tap-based actions.
      When it matters: When you want to pay quickly or pair devices with a tap.

      Importance: HIGH

      Apple Watch Series 440mm supports NFC, the average smartwatch does not. 42.5% of smartwatches support NFC.
    • Has HRV tracking
      Apple Watch Series 440mm supports HRV tracking, the average smartwatch does not. 38.2% of smartwatches support HRV tracking.
      What it is: Measurement of heart-rate variability, the change in timing between heartbeats.
      When it matters: When you want health data from your wrist during the day or night.

      Importance: MEDIUM

      Apple Watch Series 440mm supports HRV tracking, the average smartwatch does not. 38.2% of smartwatches support HRV tracking.
    • Supports Emergency SOS
      Apple Watch Series 440mm includes Emergency SOS, the average smartwatch does not. 42.4% of smartwatches include Emergency SOS.
      What it is: An emergency feature that can contact help or alert trusted people from the watch.
      When it matters: When you want extra help in an emergency.

      Importance: HIGH

      Apple Watch Series 440mm includes Emergency SOS, the average smartwatch does not. 42.4% of smartwatches include Emergency SOS.
    • Has ECG
      Apple Watch Series 440mm supports ECG, the average smartwatch does not. 15.1% of smartwatches support ECG.
    • Has HRV tracking
      Apple Watch Series 440mm supports HRV tracking, the average smartwatch does not. 38.2% of smartwatches support HRV tracking.
    • Supports VO2 max
      Apple Watch Series 440mm measures VO2 max, the average smartwatch does not. 49.3% of smartwatches measure VO2 max.
    • Has irregular heart alerts
      Apple Watch Series 440mm supports irregular heart rate warnings, the average smartwatch does not. 43.7% of smartwatches support irregular heart rate warnings.
    • Has weight tracking
      Apple Watch Series 440mm supports weight tracking, the average smartwatch does not. 39.2% of smartwatches support weight tracking.
    • Has multi-sport mode
      Apple Watch Series 440mm includes a multi-sport mode, the average smartwatch does not. 49.4% of smartwatches include a multi-sport mode.
    • Has barometer
      Apple Watch Series 440mm includes a barometer, the average smartwatch does not. 45.6% of smartwatches include a barometer.
    • Has cadence sensor
      Apple Watch Series 440mm includes a cadence sensor, the average smartwatch does not. 20.1% of smartwatches include a cadence sensor.
    • Has external HR monitor
      Apple Watch Series 440mm supports external heart rate monitor compatibility, the average smartwatch does not. 41.3% of smartwatches support external heart rate monitor compatibility.
    • Includes wireless charging
      Apple Watch Series 440mm supports wireless charging, the average smartwatch does not. 24.9% of smartwatches support wireless charging.
    • Has cellular module
      Apple Watch Series 440mm includes a cellular module, the average smartwatch does not. 17.2% of smartwatches include a cellular module.
    • Has NFC
      Apple Watch Series 440mm supports NFC, the average smartwatch does not. 42.5% of smartwatches support NFC.
    • Includes maps
      Apple Watch Series 440mm supports maps, the average smartwatch does not. 32.2% of smartwatches support maps.
    • Has compass
      Apple Watch Series 440mm includes a compass, the average smartwatch does not. 49.3% of smartwatches include a compass.
    • Supports Wi-Fi
      Apple Watch Series 440mm supports Wi-Fi, the average smartwatch does not. 43.4% of smartwatches support Wi-Fi.
    • Supports Galileo
      Apple Watch Series 440mm supports Galileo navigation, the average smartwatch does not. 38.7% of smartwatches support Galileo navigation.
    • 400 nits higher display brightness
      Apple Watch Series 440mm has higher display brightness than the average smartwatch (1,000 nits nits vs 600 nits nits). The average smartwatch reaches 600 nits nits.
    • 0.17 inch larger screen size
      Apple Watch Series 440mm has a larger screen size than the average smartwatch (1.6 inch vs 1.40 inch). The average smartwatch screen is 1.40 inch.
    • 14.9 g lighter weight
      Apple Watch Series 440mm is lighter than the average smartwatch (30.1 g vs 45 g). The average smartwatch weighs 45 g.
    • Better case material
      Apple Watch Series 440mm uses aluminum, stainless steel for the case material, while the average smartwatch uses polycarbonate.
    • 0.9 mm thinner watch body
      Apple Watch Series 440mm is thinner than the average smartwatch (10.7 mm vs 11.60 mm). The average smartwatch thickness is 11.60 mm.
    • 8 mm narrower watch width
      Apple Watch Series 440mm is narrower than the average smartwatch (34 mm vs 42.0 mm). The average smartwatch width is 42.0 mm.
    • More advanced operating system
      Apple Watch Series 440mm runs a more advanced operating system than the average smartwatch (watchOS vs Proprietary OS).
    • Includes fall detection
      Apple Watch Series 440mm supports fall detection, the average smartwatch does not. 22.4% of smartwatches support fall detection.
    • Supports Emergency SOS
      Apple Watch Series 440mm includes Emergency SOS, the average smartwatch does not. 42.4% of smartwatches include Emergency SOS.
    • Supports third-party apps
      Apple Watch Series 440mm supports third-party apps, the average smartwatch does not. 47.6% of smartwatches support third-party apps.
    • 12 GB more storage
      Apple Watch Series 440mm offers more internal storage than the average smartwatch (16 GB vs 4 GB). The average smartwatch provides 4 GB of storage.
    • Faster CPU speed
      Apple Watch Series 440mm uses a CPU configuration of 2x 1.5 GHz, while the average smartwatch uses 1 GHz.
    • More advanced processor model
      Apple Watch Series 440mm uses the Apple S4 processor model, while the average smartwatch uses Snapdragon 400.

    Total
    Health
    Fitness
    Battery
    Connectivity
    Display & Design
    Smart features
    Hardware
    • No blood oxygen
      Apple Watch Series 440mm does not support blood oxygen monitoring, the average smartwatch does. 64.4% of smartwatches support blood oxygen monitoring.
    • No stress monitoring
      Apple Watch Series 440mm does not support stress monitoring, the average smartwatch does. 65.4% of smartwatches support stress monitoring.
      Some stress features may depend on third-party apps.
    • 5,534 m lower max altitude
      Apple Watch Series 440mm supports a lower maximum altitude than the average smartwatch (3,000 m vs 8,534 m). The average smartwatch reaches 8,534 m.
    • 6.25 day/s shorter battery life
      Apple Watch Series 440mm offers 0.8 day/s of battery life, while the average smartwatch offers 7 day/s.
    • 14 h shorter GPS battery life
      Apple Watch Series 440mm lasts less with GPS on than the average smartwatch (6 h vs 20 h). The average smartwatch lasts 20 h.
    • 14.5 h shorter training battery life
      Apple Watch Series 440mm lasts less in training mode than the average smartwatch (5.5 h vs 20 h). The average smartwatch lasts 20 h.
    • 42 mAh smaller battery capacity
      Apple Watch Series 440mm has a smaller battery capacity than the average smartwatch (258 mAh vs 300 mAh). The average smartwatch battery is 300 mAh.
    • Not compatible with Android
      Apple Watch Series 440mm is not compatible with Android, the average smartwatch is. 95.3% of smartwatches are compatible with Android.
    • No always-on display
      Apple Watch Series 440mm does not have an always-on display, the average smartwatch does. 66.4% of smartwatches have an always-on display.
    • Basic display type
      Apple Watch Series 440mm uses OLED display technology, while the average smartwatch features AMOLED.
      Retina branding. LTPO panel wording.
    • No smart alarm
      Apple Watch Series 440mm does not support a smart alarm, the average smartwatch does. 52.7% of smartwatches support this feature.
      No native smart alarm; third-party app required.
    • 3 year/s older release date
      Apple Watch Series 440mm is an older model than the average smartwatch (2,018 vs 2,021). The average smartwatch was released in 2,021.
      September 2,018
    • No blood oxygen
      Apple Watch Series 440mm does not support blood oxygen monitoring, the average smartwatch does. 64.4% of smartwatches support blood oxygen monitoring.
      What it is: A wrist-based feature that estimates blood oxygen saturation over time.
      When it matters: When you want health data from your wrist during the day or night.

      Importance: HIGH

      Apple Watch Series 440mm does not support blood oxygen monitoring, the average smartwatch does. 64.4% of smartwatches support blood oxygen monitoring.
    • No always-on display
      Apple Watch Series 440mm does not have an always-on display, the average smartwatch does. 66.4% of smartwatches have an always-on display.
      What it is: A display mode that keeps key information visible even when the watch is idle.
      When it matters: When you want the screen to be easy to read at a glance.

      Importance: HIGH

      Apple Watch Series 440mm does not have an always-on display, the average smartwatch does. 66.4% of smartwatches have an always-on display.
    • No stress monitoring
      Apple Watch Series 440mm does not support stress monitoring, the average smartwatch does. 65.4% of smartwatches support stress monitoring.
      Some stress features may depend on third-party apps.
      What it is: Stress estimates derived from heart rate, HRV, or similar body signals.
      When it matters: When you want health data from your wrist during the day or night.

      Importance: HIGH

      Apple Watch Series 440mm does not support stress monitoring, the average smartwatch does. 65.4% of smartwatches support stress monitoring.
    • 6.25 day/s shorter battery life
      Apple Watch Series 440mm offers 0.8 day/s of battery life, while the average smartwatch offers 7 day/s.
      What it is: The typical endurance the watch can deliver on a full charge under the stated usage pattern.
      When it matters: When you do not want to charge the watch too often.

      Importance: HIGH

      Good value: >=7 days

      Apple Watch Series 440mm offers 0.8 day/s of battery life, while the average smartwatch offers 7 day/s.0.75 day/s vs 7 day/s
    • Not compatible with Android
      Apple Watch Series 440mm is not compatible with Android, the average smartwatch is. 95.3% of smartwatches are compatible with Android.
      What it is: Shows how well the smartwatch works with Android pairing, syncing, and core features.
      When it matters: When you use an Android phone and want the watch to pair, sync, and keep its main features working properly.

      Importance: MEDIUM

      Apple Watch Series 440mm is not compatible with Android, the average smartwatch is. 95.3% of smartwatches are compatible with Android.
    • Basic display type
      Apple Watch Series 440mm uses OLED display technology, while the average smartwatch features AMOLED.
      Retina branding. LTPO panel wording.
      What it is: The screen technology used by the watch, such as AMOLED, OLED, or memory-in-pixel LCD.
      When it matters: When you want the screen to be easy to read at a glance.

      Importance: HIGH

      Apple Watch Series 440mm uses OLED display technology, while the average smartwatch features AMOLED.OLED vs AMOLED
    • No smart alarm
      Apple Watch Series 440mm does not support a smart alarm, the average smartwatch does. 52.7% of smartwatches support this feature.
      No native smart alarm; third-party app required.
      What it is: A smart alarm tries to wake you during a lighter sleep phase within a chosen time window instead of at one fixed minute.
      When it matters: It matters if you wear your smartwatch overnight and want a gentler wake-up based on your sleep pattern rather than a standard fixed alarm.

      Importance: LOW

      Apple Watch Series 440mm does not support a smart alarm, the average smartwatch does. 52.7% of smartwatches support this feature.
    • 14 h shorter GPS battery life
      Apple Watch Series 440mm lasts less with GPS on than the average smartwatch (6 h vs 20 h). The average smartwatch lasts 20 h.
      What it is: The expected runtime when satellite tracking stays active throughout use.
      When it matters: When you do not want to charge the watch too often.

      Importance: HIGH

      Good value: >=35 h

      Apple Watch Series 440mm lasts less with GPS on than the average smartwatch (6 h vs 20 h). The average smartwatch lasts 20 h.6 h vs 20 h
    Total
    Overall
    Health
    Fitness
    Battery
    Connectivity
    Display & Design
    Smart features
    Hardware

    Graphic comparison of Apple Watch Series 4 40mm and other Smartwatches

    Attribute category
    Attribute
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    Third-party reviews

    amazon
    3.5
    84 Reviews
    amazon
    4.7
    52 Reviews
    amazon
    3.3
    26 Reviews

    (Reviews last updated: Apr 2026)

    What customers like about Apple Watch Series 4 40mm?

    • Larger, edge-to-edge display (30% more screen area)
    • Thinner, more comfortable casing compared to Series 3
    • Advanced health features: FDA-cleared ECG and Fall Detection
    • Significant speed boost with the S4 dual-core processor
    • Louder speaker (50% increase) and improved microphone placement for calls
    • Haptic feedback added to the Digital Crown for a more tactile feel
    • Backward compatibility with all previous Apple Watch bands

    What customers dislike about Apple Watch Series 4 40mm?

    • Battery life remains limited to approximately 18 hours or 1-2 days
    • No always-on display (users must raise wrist to see time)
    • Lack of native sleep tracking due to daily charging requirements
    • Higher starting price compared to previous models
    • Limited first-party watch face customisation options
    • Smaller 40mm targets can be difficult for some users to tap accurately
    • Requires an iPhone for full functionality and initial setup

    Expert reviews

    W
    wired.com
    19/09/2018
    Review: Apple Watch Series 4 - WIRED

    The Apple Watch Series 4 represents a significant, redesigned 'coming of age' for the wearable, featuring a 30% larger, edge-to-edge display, a thinner chassis, and a faster S4 chip with a haptic-enabled Digital Crown. Pros include improved screen real estate, faster performance, and a louder speaker, while the display allows for more complex, eight-complication 'Infograph' watch...Read more

    Z
    zeipad.com
    01/09/2018
    Apple Watch Series 4 Review Would you like a breakdown of the battery life or GPS accuracy results specifically for the 40mm variant compared to the l...

    The Apple Watch Series 4 introduces a significant redesign featuring a 30% larger, nearly frameless screen in 40mm and 44mm sizes, while maintaining compatibility with existing watch bands. The display incorporates rounded corners for a sleeker look, housed in a thinner, lighter casing that improves daily comfort. Performance is driven by the 64-bit S4 processor, offering up to...Read more

    W
    wareable.com
    19/09/2018
    Apple Watch Series 4 review - Wareable

    The Apple Watch Series 4 represents a significant, 'life-saving' upgrade featuring a 30% larger, rounded display, a thinner 10.7mm chassis, and a faster S4 processor. Key pros include the revolutionary FDA-cleared ECG monitor, advanced fall detection, and a significantly louder speaker for improved Siri and call quality. Despite these advancements, the device retains a mediocre...Read more

    H
    huffingtonpost.co.uk
    24/09/2018
    Apple Watch Series 4 Review: Life-Saving Features In An All-New Design

    The Huffington Post UK describes the Apple Watch Series 4 as a significant evolution, highlighting a thinner design with a 30% larger, brighter OLED Retina display. Pros include the fast S4 processor, improved speaker, and refined haptic crown, though it requires an iPhone and lacks an always-on display. Key innovations include FDA-cleared ECG functionality and advanced fall...Read more

    S
    stuff.tv
    25/09/2018
    Apple Watch Series 4 review | Stuff

    The Apple Watch Series 4 features a 30% larger, edge-to-edge display, a thinner chassis, and a faster S4 chipset, providing a significantly improved, highly responsive user experience. Key pros include enhanced health tools like ECG and fall detection, alongside a louder speaker and haptic feedback on the digital crown. Despite these advancements, the review notes several cons,...Read more

    T
    techadvisor.com
    01/10/2018
    Apple Watch 4 Review: The Best Just Got Better

    The Apple Watch Series 4 represents the first major redesign of the product line, introducing 40mm and 44mm sizes that feature screens over 30% larger with rounded corners, making information significantly easier to read. Despite the larger, more data-rich display, the device is thinner and less bulbous than the Series 3, maintaining a lightweight feel and full compatibility with...Read more

    I
    irishtimes.com
    04/10/2018
    Apple Watch Series 4 review: we've fallen for the safety features

    The Apple Watch Series 4 offers a refined, 30% larger display with slimmer bezels, enhancing usability and information display, while introducing life-saving, user-activated, or automatic fall detection and SOS alerts [1.3647424]. Key improvements include a faster processor, improved heart rate sensors, a louder speaker, and better microphone positioning for improved voice calls and...Read more

    T
    thesweetsetup.com
    16/10/2018
    A Review of the Apple Watch Series 4 - The Sweet Setup

    The Sweet Setup characterizes the Apple Watch Series 4 as a major, stylish improvement with a redesigned, thinner chassis, more rounded corners, and a superior display. The larger screen real estate, particularly on the 44mm model, is highly praised for improved interaction and readability. Performance is a key highlight, with the S4 processor delivering fast app loading and a...Read more

    T
    trustedreviews.com
    01/04/2019
    Apple Watch Series 4 Review

    The Apple Watch Series 4 features a redesigned, slimmer chassis with a 30% larger, edge-to-edge OLED display available in 40mm and 44mm sizes, while maintaining compatibility with older bands. The display is highly praised for its brightness, sharpness, and ease of interaction. Key performance upgrades include a fast S4 processor for snappy operation, a louder speaker, and critical...Read more

    C
    cyclist.co.uk
    12/05/2019
    Apple Watch Series 4 review - Cyclist

    The Cyclist review highlights the Apple Watch Series 4 as a capable device for cyclists, featuring a 30% larger, high-resolution screen, a faster processor, and improved ergonomics for all-day wearability. Standout features include advanced health monitoring with ECG and fall detection, as well as an improved infrared heart rate sensor. While effective for tracking rides via the...Read more

    T
    techradar.com
    07/06/2021
    Apple Watch 4 review - TechRadar

    The TechRadar review of the Apple Watch Series 4 highlights a significant leap in design and health technology, featuring a 30% larger OLED display with reduced bezels and enhanced performance from the S4 chip. Key pro features include proactive health tools like built-in ECG, fall detection, and a faster interface, while the primary con remains a limited 18-hour battery life....Read more

    T
    t3.com
    25/04/2022
    Apple Watch Series 4 review - T3

    The Apple Watch Series 4, reviewed by T3, marks a major hardware shift featuring a 30% larger display, a thinner casing, and a faster S4 processor that improves responsiveness. Key pros include the enhanced screen visibility, a 50% louder speaker for calls, and significant,, life-saving health upgrades like FDA-cleared ECG capabilities and automatic fall detection. Despite these...Read more

    C
    choose.co.uk
    10/08/2022
    Apple Watch Series 4 Smartwatch | Hands-on review Expert Testing Highlights Display & Design: Reviewers from T3 and TechGearLab noted that the 40mm mo...

    The Choose.co.uk review of the Apple Watch Series 4 highlights a significant redesign featuring 30% larger 40mm and 44mm displays, which improve readability while keeping the device thinner and lighter for comfortable all-day wear. Key functionalities praised include the advanced ECG app, Fall Detection for emergency alerts, and a 50% louder speaker with improved microphone...Read more

    T
    tomsguide.com
    17/09/2021
    Apple Watch Series 4 review | Tom's Guide

    The Apple Watch Series 4 features a redesigned, thinner chassis with a 30% larger, edge-to-edge display and a new 'Infograph' watch face. Performance is significantly enhanced by the faster S4 processor, allowing for instant app loading, while a 50% louder speaker improves phone call quality. Health capabilities are a major focus, including an FDA-cleared ECG app for detecting...Read more

    T
    techgearlab.com
    09/11/2018
    Apple Watch Series 4 Review | Tested & Rated

    TechGearLab highlights the Apple Watch Series 4 as a top-tier smartwatch for iPhone users, praising its 30% larger LTPO OLED Retina display and the responsive, fast S4 processor that ensures a lag-free experience. Key strengths include superior ecosystem integration and a user-friendly interface. The review notes advanced health, fitness, and safety features, such as FDA-cleared ECG...Read more

    C
    channelpartner.de
    25/09/2018
    Die Zukunft der Smartwatch: Apple Watch Series 4 im Test

    The Apple Watch Series 4 features a redesigned, nearly borderless LTPO OLED display that is over 30% larger, offering enhanced readability in a thinner form factor. It introduces advanced health capabilities, including FDA-cleared electrocardiogram (ECG) functionality and automatic fall detection for enhanced user safety. Performance is significantly improved with the S4 processor...Read more

    (Translated)Show original
    C
    chip.de
    27/09/2018
    Apple Watch Series 4 Review - CHIP

    The Apple Watch Series 4, reviewed by CHIP, represents a significant upgrade, centered on a redesigned 30% larger edge-to-edge OLED display and a thinner, more ergonomic design. Powered by the dual-core S4 chip, the device delivers a faster, more responsive user experience, featuring advanced health capabilities such as electrocardiogram (ECG) tracking and fall detection. While...Read more

    (Translated)Show original
    S
    stern.de
    19/09/2018
    Apple Watch Series 4 Test: Diese Uhr soll Leben retten

    The Apple Watch Series 4 features a significant redesign with a larger, nearly borderless screen and a thinner case, maximizing display space with the new 'Infograph' face. The updated hardware includes a twice-as-fast S4 processor and a Digital Crown with haptic feedback, enhancing user interface navigation. Key advancements center on health and safety, including an integrated ECG...Read more

    (Translated)Show original
    N
    numerama.com
    25/09/2018
    Test de l'Apple Watch Series 4 : une smartwatch qu'on a enfin envie de porter

    Numerama's review highlights the Apple Watch Series 4 as a major design evolution, featuring significantly reduced bezels and a 30% larger display, which results in a more refined, less 'gadget-like' appearance. The thinner profile and improved haptic feedback on the Digital Crown, alongside a more fluid user interface, enhance the overall experience. Key functional advantages...Read more

    (Translated)Show original
    C
    cnetfrance.fr
    30/10/2018
    Test de l'Apple Watch Series 4 : la meilleure des montres...

    The CNET France review highlights the Apple Watch Series 4 as a major, thinner evolution featuring a larger, nearly bezel-less display, faster S4 processor, and groundbreaking, FDA-cleared ECG and fall detection capabilities. Performance is enhanced by a louder speaker and a smoother interface, making it the top smartwatch for iPhone users. Persistent drawbacks include a limited 1.5...Read more

    (Translated)Show original
    N
    nakan.ch
    22 octobre 2018
    L'Apple Watch Series 4 testée de fond en comble

    The Apple Watch Series 4 features a redesigned, slimmer chassis with 40mm or 44mm cases, housing a larger LTPO display and the faster S4 processor for enhanced performance [1.1]. Key hardware improvements include a haptic-feedback Digital Crown and a redesigned speaker/microphone system that significantly improves call quality [1.1]. Health and fitness tracking is enhanced by ECG...Read more

    (Translated)Show original
    L
    lesnumeriques.com
    12 octobre 2018
    Test Apple Watch series 4 : la reine des smartwatches se perfectionne

    Les Numériques highlights the Apple Watch Series 4 as a major design evolution featuring a 30% larger screen with narrower bezels, improving legibility and enabling more complex watch faces. The review praises the device's faster S4 processor, improved microphone/speaker quality, and significant health features, including a built-in ECG sensor and fall detection. Performance is...Read more

    (Translated)Show original
    S
    sport-passion.fr
    25 septembre 2018
    Apple Watch Series 4: Review, Feedback, and What You Need to Know

    According to Sport Passion, the Apple Watch Series 4 is a refined, comprehensive wearable featuring a 30% larger, thinner display and a faster S4 processor for improved navigation. Key health-focused advancements include on-demand ECG capabilities, enhanced heart rate sensors, fall detection, and automatic workout recognition, making it a powerful tool for monitoring physical...Read more

    (Translated)Show original
    W
    watchgeneration.fr
    28 septembre 2018
    Test de l'Apple Watch Series 4

    The Apple Watch Series 4 represents a major evolution, featuring a redesigned, thinner chassis with larger 40mm and 44mm displays, allowing for more immersive, information-dense watch faces. The improved LTPO OLED screen and thinner profile enhance user experience without sacrificing the 18-hour battery life. Powered by the 64-bit S4 processor, the device offers fast performance,...Read more

    (Translated)Show original
    M
    mac4ever.com
    12/10/2018
    Test de l'Apple Watch Series 4

    The Apple Watch Series 4 features a comprehensive design update with 40mm and 44mm cases, providing 30% more screen area and a thinner profile. The S4 chip significantly boosts performance, enabling faster app loading and the complex 'Infograph' watch face with up to eight complications. Key health and safety advancements include an FDA-cleared ECG app and new fall detection...Read more

    (Translated)Show original
    0
    01net.com
    26/09/2018
    Apple Watch Series 4 Review: Improving the Best Smartwatch Once Again

    01net highlights the Apple Watch Series 4 as a major, refined update, featuring 40mm and 44mm cases with a display over 30% larger and a faster S4 dual-core chip. Key advantages include advanced health features like an ECG sensor and fall detection, alongside a 50% louder speaker and consistent 18-hour battery life. While praised as a leading smartwatch, limitations noted in the...Read more

    (Translated)Show original
    R
    revistagq.com
    24/09/2018
    Apple Watch Series 4: finally a watch on par with the iPhone

    The Revista GQ review highlights the Apple Watch Series 4 as a significant redesign, featuring a 30% larger OLED display, a faster S4 processor, and improved health tracking capabilities like ECG and fall detection. While the design is praised for its modern aesthetic and improved speaker quality, the watch continues to offer backward compatibility for all previous bands. Key...Read more

    (Translated)Show original
    A
    andreagaleazzi.com
    27/09/2018
    Recensione APPLE WATCH 4 e una giornata SENZA... - Andrea Galeazzi

    Andrea Galeazzi reviews the Apple Watch Series 4 as a major, thinner redesign with a ~30% larger screen, better processor performance, and a 50% louder speaker. Key pros are the improved display with rounded corners and the S4 processor speed, while maintaining compatibility with old bands. The review highlights advanced health features, including the ECG via the Digital Crown,...Read more

    (Translated)Show original
    T
    tech.everyeye.it
    12/10/2018
    Apple Watch 4 Recensione: un altro passo verso la perfezione - Everyeye Tech

    Everyeye.it's review of the Apple Watch Series 4 highlights a significant leap in design, featuring a 30% larger screen in 40mm and 44mm sizes, a refined Digital Crown, and a new ceramic/sapphire back. The improved display and premium build quality are major pros, while the high price point compared to the Series 3 is noted as a drawback. Powered by the S4 dual-core 64-bit...Read more

    (Translated)Show original
    P
    panorama.it
    30/09/2018
    Nuovo Apple Watch 4: la recensione

    The Apple Watch Series 4, as reviewed by Panorama, introduces a significant design update featuring a 30% larger, rounded display with slimmer bezels, enhancing readability. The device boasts the S4 64-bit processor for a faster, more fluid interface and a redesigned digital crown providing haptic feedback. Additionally, call quality and voice commands are improved with 50% louder...Read more

    (Translated)Show original
    G
    global.techradar.com
    17/05/2019
    Recensione Apple Watch 4 - TechRadar Italia

    The Apple Watch Series 4 introduces a significant redesign with a 30% larger display, rounded corners, and a slimmer chassis featuring a ceramic back for improved cellular performance. Key hardware updates include a 50% louder speaker and a redesigned Digital Crown providing haptic feedback. While the design is a major pro, it remains exclusive to the Apple ecosystem, a drawback for...Read more

    (Translated)Show original
    S
    saggiamente.com
    06/11/2018
    Recensione: Apple Watch Serie 4, l'insostenibile richiamo del superfluo - Saggiamente

    The review from Saggiamente characterizes the Apple Watch Series 4 as a major design evolution featuring a larger, thinner, and faster 40mm or 44mm OLED display that renders previous models obsolete. Key benefits include the rapid S4 processor, improved speaker/microphone placement, and a haptic Digital Crown, although the review questions the absolute necessity of advanced features...Read more

    (Translated)Show original
    M
    macitynet.it
    26/09/2018
    Apple Watch 4, la recensione del vostro prossimo smartwatch - Macitynet

    The Macitynet review highlights the Apple Watch Series 4 as a major redesign featuring a 30% larger display in 40mm and 44mm sizes, which feels thinner and more comfortable on the wrist. It boasts significant performance improvements with the S4 dual-core processor, along with enhanced health features including built-in ECG, fall detection, and a 50% louder speaker. Despite these...Read more

    (Translated)Show original
    I
    iphoneitalia.com
    01/10/2018
    Apple Watch Serie 4: questa volta lo comprerai! - iPhone Italia

    The iPhoneItalia review highlights the Apple Watch Series 4 as a major leap forward, primarily due to its redesigned hardware, 30% larger display, and refined, thinner aesthetics. The device offers significant improvements in usability, including a louder speaker for calls and a digital crown with haptic feedback. Pros include enhanced screen visibility and compatibility with...Read more

    (Translated)Show original
    P
    portablegear.nl
    21/09/2018
    Apple Watch Series 4 review - PortableGear.nl

    The Apple Watch Series 4 features a 30% larger, edge-to-edge display and a thinner, less bulky design compared to its predecessors, powered by the 64-bit dual-core S4 chip for faster performance. Key pros highlighted include improved screen visibility for apps and messaging, along with a reengineered digital crown providing haptic feedback. Health and safety capabilities are major...Read more

    (Translated)Show original
    I
    iculture.nl
    28/09/2018
    Apple Watch Series 4 review: het grotere scherm maakt 'm echt beter

    The Apple Watch Series 4 features a major redesign with larger, thinner 40mm and 44mm cases and a 30% larger edge-to-edge OLED display with rounded corners. While the improved screen and faster performance are major pros, the lack of an always-on display remains a downside. Powered by the 64-bit S4 processor, the device offers a significantly faster, more responsive user experience...Read more

    (Translated)Show original
    I
    iphoned.nl
    27/09/2018
    Apple Watch Series 4 review: larger screen, even faster, and better speaker

    The Apple Watch Series 4, as reviewed by iPhoned.nl, represents a major update with a 30% larger, edge-to-edge OLED display and a thinner, more comfortable design featuring a ceramic/sapphire back. Driven by the faster S4 processor, the device offers enhanced performance for apps, improved audio with a louder speaker, and a Digital Crown with haptic feedback. Key health advancements...Read more

    (Translated)Show original
    T
    tweakers.net
    11/05/2020
    Apple Watch Series 4 - Gebruikersreviews - Tweakers

    The Apple Watch Series 4 represents a major, matured redesign for the lineup, featuring 40mm and 44mm sizes with reduced bezels and a 30% larger screen area. This model is thinner, more comfortable, and boasts a vibrant OLED display, making it a significant aesthetic and functional upgrade. Performance is drastically improved by the S4 chip, providing a smooth user experience and...Read more

    (Translated)Show original

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