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Apple Watch Series 6 40mm Review | 126 Data compared

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  • Avg. price: ~£240
  • Screen size: 1.57 inch
  • Battery life: 0.75 day/s
  • Display type: OLED

Apple Watch Series 6 40mm review. Compare 126 technical specifications and user reviews to see how it ranks among smartwatches and if it is worth buying.

8.1

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%

8.0

Technical Score

10.0%

8.9

User score

Excellent
8.0

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%

7.4

Health

21.0%

9.9

Fitness

16.0%

4.6

Battery

14.0%

9.2

Smart features

12.0%

8.9

Connectivity

9.0%

8.2

Display & Design

4.0%

7.7

Hardware

Excellent
8.9

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%

8.5

User reviews

30.0%

10

Popularity

User score:
amazon
4.7
(982)
amazon
3.9
(617)
amazon
3.8
(416)
amazon
4.0
(330)
amazon
4.8
(214)
amazon
3.9
(123)
amazon
2.8
(34)
amazon
3.4
(29)

(Reviews last updated: Apr 2026)

Excellent
    • apple-watch-series-6-40mm
    apple-watch-series-6-40mm

    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 6 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%

    7.4

    Health

    21.0%

    9.9

    Fitness

    16.0%

    4.6

    Battery

    14.0%

    9.2

    Smart features

    12.0%

    8.9

    Connectivity

    9.0%

    8.2

    Display & Design

    4.0%

    7.7

    Hardware

    8.0
    Apple Watch Series 6 40mm has a technical score of 7.99 points, which is higher than 86.5% 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%

    8.5

    User reviews

    30.0%

    10

    Popularity

    User score:
    amazon
    4.7
    (982)
    amazon
    3.9
    (617)
    amazon
    3.8
    (416)
    amazon
    4.0
    (330)
    amazon
    4.8
    (214)
    amazon
    3.9
    (123)
    amazon
    2.8
    (34)
    amazon
    3.4
    (29)

    (Reviews last updated: Apr 2026)

    8.9
    Apple Watch Series 6 40mm has a user score of 8.93 points, which is higher than 89.1% 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.
    10
    Apple Watch Series 6 40mm has a popularity of 10 points, which is higher than 74.7% 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%

    8.1

    Overall score

    40.0%

    9.3

    Price

    8.4
    Apple Watch Series 6 40mm has a quality-to-price ratio of 8.4 points, which is higher than 88.3% 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 6 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

    yes
    Apple Watch Series 6 40mm supports 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 6 40mm supports ECG. 15.1% of smartwatches support ECG.
    Availability may vary by region or model version. May require a compatible phone, software version, or app setup.
    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 6 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 6 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 6 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 6 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 6 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 6 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 6 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.
    Converted from the reported 18-hour battery life.
    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

    19.5 h
    Apple Watch Series 6 40mm lasts 19.5 h in training mode which is shorter than 50.5% of smartwatches and equal to that of 0.2% 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

    7 h
    Apple Watch Series 6 40mm lasts 7 h with GPS on which is shorter than 81.1% of smartwatches and equal to that of 4.7% 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

    265 mAh
    Apple Watch Series 6 40mm has a battery capacity of 265 mAh which is smaller than the batteries in 65.5% of smartwatches and equal to those in 0.3% of smartwatches.
    Battery capacity varies by case size/model variant.
    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

    ?
    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 6 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 (26.2).
    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

    regular
    Apple Watch Series 6 40mm has regular software update support which is more active than that of 94% of smartwatches and equal to that of 6% of smartwatches.
    Updates are released regularly throughout the year.
    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 6 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 6 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 6 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 6 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

    1
    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 6 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 6 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 6 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 6 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 6 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 6 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 6 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 6 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 1.8 GHz
    Apple Watch Series 6 40mm uses a CPU configuration of 2 x 1.8 GHz which is faster than that in 80% of smartwatches and equal to that in 2.4% 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 S6
    Apple Watch Series 6 40mm uses the Apple S6 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 6 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

    32 GB
    Apple Watch Series 6 40mm uses 32 GB for internal storage which is larger than that of 84.8% of smartwatches and equal to that of 13.4% 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 6 40mm does not include an external memory slot. 0.3% of smartwatches include an external memory slot.
    Show more

    Apple Watch Series 6 40mm vs the average smartwatch

    • Has cellular module
      Apple Watch Series 640mm 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 640mm includes a cellular module, the average smartwatch does not. 17.2% of smartwatches include a cellular module.
    • Has ECG
      Apple Watch Series 640mm supports ECG, the average smartwatch does not. 15.1% of smartwatches support ECG.
      Availability may vary by region or model version. May require a compatible phone, software version, or app setup.
      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 640mm supports ECG, the average smartwatch does not. 15.1% of smartwatches support ECG.
    • More advanced operating system
      Apple Watch Series 640mm runs a more advanced operating system than the average smartwatch (watchOS vs Proprietary OS).
      OS detail: watchOS (26.2).
      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 640mm runs a more advanced operating system than the average smartwatch (watchOS vs Proprietary OS).watchOS vs Proprietary OS
    • Includes fall detection
      Apple Watch Series 640mm 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 640mm supports fall detection, the average smartwatch does not. 22.4% of smartwatches support fall detection.
    • Includes wireless charging
      Apple Watch Series 640mm supports wireless charging, the average smartwatch does not. 24.9% of smartwatches support wireless charging.
      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 640mm supports wireless charging, the average smartwatch does not. 24.9% of smartwatches support wireless charging.
    • 28 GB more storage
      Apple Watch Series 640mm offers more internal storage than the average smartwatch (32 GB vs 4 GB). The average smartwatch provides 4 GB of 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

      Apple Watch Series 640mm offers more internal storage than the average smartwatch (32 GB vs 4 GB). The average smartwatch provides 4 GB of storage.32 GB vs 4 GB
    • Has NFC
      Apple Watch Series 640mm 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 640mm supports NFC, the average smartwatch does not. 42.5% of smartwatches support NFC.
    • More frequent updates
      Apple Watch Series 640mm receives regular software updates, while the average smartwatch receives ended updates.
      Updates are released regularly throughout the year.
      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

      Apple Watch Series 640mm receives regular software updates, while the average smartwatch receives ended updates.regular vs ended
    • Has ECG
      Apple Watch Series 640mm supports ECG, the average smartwatch does not. 15.1% of smartwatches support ECG.
    • Has HRV tracking
      Apple Watch Series 640mm supports HRV tracking, the average smartwatch does not. 38.2% of smartwatches support HRV tracking.
    • Supports VO2 max
      Apple Watch Series 640mm measures VO2 max, the average smartwatch does not. 49.3% of smartwatches measure VO2 max.
    • Has irregular heart alerts
      Apple Watch Series 640mm 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 640mm supports weight tracking, the average smartwatch does not. 39.2% of smartwatches support weight tracking.
    • Has multi-sport mode
      Apple Watch Series 640mm includes a multi-sport mode, the average smartwatch does not. 49.4% of smartwatches include a multi-sport mode.
    • Has barometer
      Apple Watch Series 640mm includes a barometer, the average smartwatch does not. 45.6% of smartwatches include a barometer.
    • Has cadence sensor
      Apple Watch Series 640mm includes a cadence sensor, the average smartwatch does not. 20.1% of smartwatches include a cadence sensor.
    • Has external HR monitor
      Apple Watch Series 640mm 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 640mm supports wireless charging, the average smartwatch does not. 24.9% of smartwatches support wireless charging.
    • Has cellular module
      Apple Watch Series 640mm includes a cellular module, the average smartwatch does not. 17.2% of smartwatches include a cellular module.
    • Has NFC
      Apple Watch Series 640mm supports NFC, the average smartwatch does not. 42.5% of smartwatches support NFC.
    • Includes maps
      Apple Watch Series 640mm supports maps, the average smartwatch does not. 32.2% of smartwatches support maps.
    • Has compass
      Apple Watch Series 640mm includes a compass, the average smartwatch does not. 49.3% of smartwatches include a compass.
    • Supports Wi-Fi
      Apple Watch Series 640mm supports Wi-Fi, the average smartwatch does not. 43.4% of smartwatches support Wi-Fi.
    • Supports Galileo
      Apple Watch Series 640mm supports Galileo navigation, the average smartwatch does not. 38.7% of smartwatches support Galileo navigation.
    • Has UWB chip
      Apple Watch Series 640mm includes a UWB chip, while the average smartwatch does not. 2.6% of smartwatches include UWB.
    • 400 nits higher display brightness
      Apple Watch Series 640mm 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 640mm has a larger screen size than the average smartwatch (1.6 inch vs 1.40 inch). The average smartwatch screen is 1.40 inch.
    • Better case material
      Apple Watch Series 640mm uses aluminum, stainless steel, titanium for the case material, while the average smartwatch uses polycarbonate.
    • 14.5 g lighter weight
      Apple Watch Series 640mm is lighter than the average smartwatch (30.5 g vs 45 g). The average smartwatch weighs 45 g.
    • 0.86 mm thinner watch body
      Apple Watch Series 640mm 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 640mm 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 640mm runs a more advanced operating system than the average smartwatch (watchOS vs Proprietary OS).
    • Includes fall detection
      Apple Watch Series 640mm supports fall detection, the average smartwatch does not. 22.4% of smartwatches support fall detection.
    • More frequent updates
      Apple Watch Series 640mm receives regular software updates, while the average smartwatch receives ended updates.
    • Supports Emergency SOS
      Apple Watch Series 640mm includes Emergency SOS, the average smartwatch does not. 42.4% of smartwatches include Emergency SOS.
    • Supports third-party apps
      Apple Watch Series 640mm supports third-party apps, the average smartwatch does not. 47.6% of smartwatches support third-party apps.
    • 28 GB more storage
      Apple Watch Series 640mm offers more internal storage than the average smartwatch (32 GB vs 4 GB). The average smartwatch provides 4 GB of storage.
    • Faster CPU speed
      Apple Watch Series 640mm uses a CPU configuration of 2x 1.8 GHz, while the average smartwatch uses 1 GHz.
    • More advanced processor model
      Apple Watch Series 640mm uses the Apple S6 processor model, while the average smartwatch uses Snapdragon 400.

    Total
    Overall
    Health
    Fitness
    Battery
    Connectivity
    Display & Design
    Smart features
    Hardware
    • 5,534 m lower max altitude
      Apple Watch Series 640mm supports a lower maximum altitude than the average smartwatch (3,000 m vs 8,534 m). The average smartwatch reaches 8,534 m.
      Apple lists a 10,000 ft / 3,000 m operating-altitude limit for standard non-Ultra models.
    • 6.25 day/s shorter battery life
      Apple Watch Series 640mm offers 0.8 day/s of battery life, while the average smartwatch offers 7 day/s.
      Converted from the reported 18-hour battery life.
    • 13 h shorter GPS battery life
      Apple Watch Series 640mm lasts less with GPS on than the average smartwatch (7 h vs 20 h). The average smartwatch lasts 20 h.
    • 35 mAh smaller battery capacity
      Apple Watch Series 640mm has a smaller battery capacity than the average smartwatch (265 mAh vs 300 mAh). The average smartwatch battery is 300 mAh.
      Battery capacity varies by case size/model variant.
    • Not compatible with Android
      Apple Watch Series 640mm is not compatible with Android, the average smartwatch is. 95.3% of smartwatches are compatible with Android.
    • Basic display type
      Apple Watch Series 640mm uses OLED display technology, while the average smartwatch features AMOLED.
      Retina branding. LTPO panel wording.
    • No smart alarm
      Apple Watch Series 640mm does not support a smart alarm, the average smartwatch does. 52.7% of smartwatches support this feature.
    • 6.25 day/s shorter battery life
      Apple Watch Series 640mm offers 0.8 day/s of battery life, while the average smartwatch offers 7 day/s.
      Converted from the reported 18-hour 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

      Apple Watch Series 640mm 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 640mm 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 640mm is not compatible with Android, the average smartwatch is. 95.3% of smartwatches are compatible with Android.
    • Basic display type
      Apple Watch Series 640mm 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 640mm uses OLED display technology, while the average smartwatch features AMOLED.OLED vs AMOLED
    • No smart alarm
      Apple Watch Series 640mm does not support a smart alarm, the average smartwatch does. 52.7% of smartwatches support this feature.
      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 640mm does not support a smart alarm, the average smartwatch does. 52.7% of smartwatches support this feature.
    • 13 h shorter GPS battery life
      Apple Watch Series 640mm lasts less with GPS on than the average smartwatch (7 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 640mm lasts less with GPS on than the average smartwatch (7 h vs 20 h). The average smartwatch lasts 20 h.7 h vs 20 h
    • 5,534 m lower max altitude
      Apple Watch Series 640mm supports a lower maximum altitude than the average smartwatch (3,000 m vs 8,534 m). The average smartwatch reaches 8,534 m.
      Apple lists a 10,000 ft / 3,000 m operating-altitude limit for standard non-Ultra models.
      What it is: The highest altitude at which the watch is rated to operate correctly.
      When it matters: When you use the watch in heat, cold, or at high altitude.

      Importance: MEDIUM

      Good value: >=8900 m

      Apple Watch Series 640mm supports a lower maximum altitude than the average smartwatch (3,000 m vs 8,534 m). The average smartwatch reaches 8,534 m.3,000 m vs 8,534 m
    • 35 mAh smaller battery capacity
      Apple Watch Series 640mm has a smaller battery capacity than the average smartwatch (265 mAh vs 300 mAh). The average smartwatch battery is 300 mAh.
      Battery capacity varies by case size/model variant.
      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

      Apple Watch Series 640mm has a smaller battery capacity than the average smartwatch (265 mAh vs 300 mAh). The average smartwatch battery is 300 mAh.265 mAh vs 300 mAh
    • 84.6% more expensive
      Apple Watch Series 640mm is more expensive than the average smartwatch (£240 vs £130).
      Apple Watch Series 640mm is more expensive than the average smartwatch (£240 vs £130).£240 vs £130
    Total
    Overall
    Fitness
    Battery
    Connectivity
    Display & Design
    Smart features

    Graphic comparison of Apple Watch Series 6 40mm and other Smartwatches

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    Third-party reviews

    amazon
    4.7
    982 Reviews
    amazon
    3.9
    617 Reviews
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    3.8
    416 Reviews
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    4.8
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    3.9
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    2.8
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    amazon
    3.4
    29 Reviews

    (Reviews last updated: Apr 2026)

    What customers like about Apple Watch Series 6 40mm?

    • Bright always-on Retina display that is easy to read in direct sunlight
    • Comprehensive health sensors including SpO2 (blood oxygen) and ECG monitoring
    • Fast and responsive performance powered by the S6 SiP chip
    • Quick charging capabilities, reaching 80% in about an hour
    • Extensive third-party app support and seamless integration with the Apple ecosystem
    • Attractive design with a wide variety of case colours and strap options

    What customers dislike about Apple Watch Series 6 40mm?

    • Battery life typically only lasts 18 to 36 hours, requiring daily charging
    • Expensive price point compared to competitors and the Apple Watch SE
    • Sleep tracking is considered basic and less detailed than rival brands
    • Exclusively compatible with iPhones, limiting its user base
    • Some users find the blood oxygen data difficult to interpret or take action on
    • Reports of durability issues, such as screen cracking or malfunctions over time

    Expert reviews

    T
    theguardian.com
    05/10/2020
    Apple Watch Series 6 review: faster, cheaper, still the best

    The Apple Watch Series 6 is defined as a refined, iterative update featuring a faster S6 chip, a 2.5 times brighter always-on display, and a new blood oxygen (SpO2) sensor. Key improvements include faster charging (0-100% in 83 minutes), accurate activity tracking with a new always-on altimeter, and seamless iPhone integration. However, the review notes the blood oxygen data is of...Read more

    U
    uk.pcmag.com
    09/11/2020
    Apple Watch Series 6 - Review 2020 - PCMag UK

    The PCMag UK review identifies the Apple Watch Series 6 as a premier wearable, highlighting the new blood oxygen (SpO2) sensor and the faster S6 SiP processor. A significant 500-nit, always-on display enhances outdoor visibility, while watchOS 7 adds specialized features like a 20-second handwashing timer. PCMag UKKey pros include comprehensive health monitoring—such as ECG, heart...Read more

    T
    tomsguide.com
    17/12/2021
    Apple Watch Series 6 review - Tom's Guide

    The Apple Watch Series 6 review from Tom's Guide highlights it as a top-tier wearable that refines the successful formula of its predecessors, introducing a faster S6 processor, a brighter always-on display, and a new blood oxygen (SpO2) sensor. It maintains its position as the best smartwatch for iPhone users due to seamless ecosystem integration and expanded health features. Key...Read more

    R
    radiotimes.com
    12/03/2021
    Apple Watch 6 review | Radio Times Would you like to see a comparison of these test results specifically regarding the battery life or the accuracy of...

    The Radio Times review describes the Apple Watch Series 6 as a premium, feature-rich smartwatch that reinforces Apple's market leadership with enhanced health tools, including a Blood Oxygen (SpO2) monitor and an ECG app. Key strengths include a bright display, highly customizable design, and slick performance with robust activity tracking and Apple Pay functionality. However, the...Read more

    T
    techradar.com
    16/09/2021
    Apple Watch 6 review - TechRadar

    The Apple Watch Series 6 is a refined, incremental update offering a brighter always-on OLED display and new color options, including (PRODUCT)RED and blue. It introduces faster performance via the S6 chip and useful health features like blood oxygen monitoring, yet lacks a headline feature that makes upgrading from the Series 5 essential. Key pros include the 2.5x brighter display,...Read more

    T
    techadvisor.com
    21/10/2020
    Apple Watch Series 6 Review - Tech Advisor

    The Apple Watch Series 6 is described by Tech Advisor as an evolutionary step, featuring a faster S6 processor, a more efficient U1 chip, and a significantly brighter always-on display that is 2.5 times more visible outdoors. The device introduces new aesthetic options, including blue and (PRODUCT)RED aluminum cases. Key features include a blood oxygen (SpO2) sensor and an always-on...Read more

    T
    t3.com
    15/11/2021
    Apple Watch Series 6 review - T3

    The Apple Watch Series 6 is identified by T3 as a top-tier, yet iterative, upgrade featuring a 20% faster S6 processor, a noticeably brighter always-on display, and new health sensors for blood oxygen (SpO2) and elevation tracking. The device also boasts faster charging, reaching full capacity in about 90 minutes, which alleviates the limitation of the standard 18-hour battery life....Read more

    A
    abendblatt.de
    30/09/2020
    Apple Watch Series 6 and Watch SE Review

    The Apple Watch Series 6 and SE, while top-tier for iPhone users, reveal weaknesses centered on incremental updates and battery constraints. The Series 6 features a 2.5x brighter always-on display, faster charging, and new blood oxygen/ECG sensors, but still faces 18-hour battery limitations and offers limited utility from its non-medical grade SpO2 sensor. The budget-friendly SE...Read more

    (Translated)Show original
    C
    chip.de
    10/11/2020
    Apple Watch Series 6 LTE 44mm Test (beinhaltet Details zur 40mm-Variante)

    The CHIP review highlights the Apple Watch Series 6 (44mm, LTE) as a top-tier wearable featuring a blood oxygen sensor, a faster S6 SiP chip, and a significantly brighter Always-On OLED display. Key advantages include comprehensive health tracking (ECG, fall detection), precise heart rate monitoring, and the flexibility of LTE/eSIM functionality. However, the analysis notes a...Read more

    (Translated)Show original
    D
    dasfilter.com
    29/10/2020
    Review: Apple Watch Series 6 - Kind Of Blue

    The Das Filter review describes the Apple Watch Series 6 as a refined, top-tier wearable, highlighting the new blue finish, a 2.5x brighter always-on display, and the faster S6 chip for a smoother interface. Key advancements include the blood oxygen (SpO2) sensor for expanded health tracking and significantly faster charging times. Positively, the watch is praised for its deep...Read more

    (Translated)Show original
    C
    chip.de
    05/11/2020
    Apples beste Smartwatch: Die Watch Series 6 im Test

    The Apple Watch Series 6 features a refined design with an 'Always-On' Retina display that is up to 2.5 times brighter, powered by the 20% faster S6 SiP processor for a smooth interface. Key additions include a U1 chip for Ultra-Wideband support, faster 5GHz Wi-Fi, and improved health tracking capabilities. Health and fitness enhancements are central, headlined by a new SpO2 sensor...Read more

    (Translated)Show original
    S
    spiegel.de
    22/09/2020
    Apple Watch 6 und Apple Watch SE im Test: Die 2 aus der Zwischenzeit

    The Der Spiegel review of the 2020 Apple Watch lineup positions the Series 6 as a premium device focused on advanced health tracking, including blood oxygen (SpO2) and ECG sensors, while the Apple Watch SE is highlighted as a high-value alternative offering core, essential features. The Series 6 boasts a brighter always-on display, faster S6 chip, and quicker charging, though its...Read more

    (Translated)Show original
    M
    macwelt.de
    28/09/2020
    Apple Watch 6 Review: Oximeter with many question marks

    The Macwelt review of the Apple Watch Series 6 highlights key hardware upgrades, specifically the new blood oxygen (SpO2) sensor and a significantly brighter always-on display. While the S6 chip offers 20% faster performance, the review finds the oximeter, despite providing on-demand measurements, serves more for general wellness rather than medical diagnosis. Improved charging...Read more

    (Translated)Show original
    C
    computerbild.de
    13/09/2022
    Apple Watch 6: Test – lohnt sie sich noch?

    The Apple Watch Series 6, rated "Good" (1.5) by Computer Bild, focuses on refinement with a faster S6 chip, a brighter Always-On display, a blood oxygen sensor, and a real-time altimeter. Key features include improved health tracking and faster charging, designed to support the new sleep tracking capabilities in watchOS 7. While offering excellent performance and ecosystem...Read more

    (Translated)Show original
    L
    lepetitpoussoir.fr
    27/05/2021
    Apple Watch Series 6 : Constat de la Meilleure Montre Connectée

    Le Petit Poussoir identifies the Apple Watch Series 6 as the leading smartwatch, effectively bridging the gap between high-tech utility and a stylish accessory. The review highlights a refined design, available in various materials, featuring an Always-On Retina display that is 2.5 times brighter than its predecessor. Key performance and health pros include the faster S6 SiP...Read more

    (Translated)Show original
    L
    lexpress.fr
    22/09/2020
    On a testé l'Apple Watch Series 6 et l'Apple Watch SE : verdict

    L'Express reviews the Apple Watch Series 6 and SE, noting their shared, discreet design, while highlighting the Series 6 as the premium choice featuring advanced blood oxygen (SpO2) and ECG sensors. The Series 6 boasts a faster S6 processor and a brighter, 2.5 times more luminous 'Always-On' display, with pros including top-tier health monitoring and cons being its high price and...Read more

    (Translated)Show original
    P
    phonandroid.com
    07/10/2020
    Test Apple Watch Series 6 : notre avis complet sur la meilleure montre connectée

    The Phonandroid review describes the Apple Watch Series 6 as an incremental but solid evolution of its predecessor, particularly praised for its stunning, brighter LTPO OLED display and a 20% performance boost from the new S6 chip. Key advantages include improved, faster charging that hits 100% in roughly 90 minutes and a wider, more vibrant selection of case colors. Health and...Read more

    (Translated)Show original
    N
    nakan.ch
    02/11/2020
    L'Apple Watch Series 6 testée de fond en comble

    The Apple Watch Series 6 is a mature evolution featuring a faster S6 chip, a new SpO2 sensor for blood oxygen, and a significantly brighter always-on display, which is ideal for outdoor visibility. Key improvements include a always-on altimeter for real-time elevation tracking during activities like skiing or hiking, marking it as a strong choice for active users. Health and sports...Read more

    (Translated)Show original
    S
    sport-passion.fr
    08/10/2020
    Apple Watch Series 6 : un oxymètre de pouls en plus

    The Sport-Passion review highlights the Apple Watch Series 6 as a top-tier athletic device, praising its fast S6 chip and highly accurate heart rate monitoring. Key improvements include a brighter always-on display and a specialized always-on altimeter for improved outdoor tracking. Versatility is a major strength, with effective automatic swimming stroke detection, offline music...Read more

    (Translated)Show original
    L
    lefigaro.fr
    17/09/2020
    Nous avons pris en main l'Apple Watch Series 6, une belle évolution sans véritable révolution

    Le Figaro characterizes the Apple Watch Series 6 as a refined evolution focusing on health, highlighted by the addition of a blood oxygen (SpO2) sensor for wellness monitoring and a new, responsive always-on altimeter. The device improves upon its predecessor with 20% faster performance via the S6 chip and a brighter, more visible screen. Hardware enhancements include new blue and...Read more

    (Translated)Show original
    P
    presse-citron.net
    31/10/2020
    Apple Watch Series 6 Review: A Breath of Fresh Air

    According to the Presse-citron review, the Apple Watch Series 6 is a refined, top-tier smartwatch featuring a faster S6 chip, a brighter Always-On display, and new health sensors for blood oxygen (SpO2) and altitude tracking. Key advantages include significantly faster charging—reaching full capacity in 90 minutes—and a highly fluid user experience, making it a robust health and...Read more

    (Translated)Show original
    C
    clubic.com
    07/06/2021
    Apple Watch Series 6 Review: A subtle evolution taking another step toward health

    According to the Clubic review, the Apple Watch Series 6 is a refined "gentle evolution" featuring a 20% faster S6 chip, an brighter Always-On display, and a new blood oxygen (SpO2) sensor. Key health improvements and faster charging (full charge in 90 minutes) are major advantages, though the 18-hour battery life remains unchanged. While the device excels in performance and health...Read more

    (Translated)Show original
    L
    lesnumeriques.com
    16/10/2020
    Test Apple Watch Series 6 : des nouveautés peu transcendantes, mais une expérience toujours au sommet

    Les Numériques describes the Apple Watch Series 6 as a refined, 'buttery smooth' evolution featuring a significantly brighter 'Always-On' display and a fast S6 processor. Key pros include the blood oxygen (SpO2) sensor and always-on altimeter, which strengthen its position as a top-tier health tracker. However, the review highlights the 18 to 24-hour battery life as the main...Read more

    (Translated)Show original
    E
    es.root-nation.com
    15/12/2020
    Reseña del Apple Watch Series 6: ¿Vale la pena actualizarlo?

    The Apple Watch Series 6 is a refined upgrade featuring a 20% faster S6 processor, a brighter always-on display, and improved connectivity via the U1 chip and 5GHz Wi-Fi. Key additions focus on health, including a new blood oxygen (SpO2) sensor, an always-on altimeter, and expanded color options. Pros highlighted in the Root Nation review include exceptional haptic feedback, a...Read more

    (Translated)Show original
    H
    hablandodemanzanas.com
    08/10/2021
    1 año con el Apple Watch Series 6 · Análisis y Opinión

    After a year of use, the Apple Watch Series 6 is considered a top-tier wearable, featuring refined hardware and the S6 chip for a 20% performance boost. Key advantages include a significantly brighter Always-On Retina display, the addition of a blood oxygen sensor for health monitoring, and a more reliable, faster-charging battery. Despite these improvements, the device still faces...Read more

    (Translated)Show original
    P
    pisapapeles.net
    25/11/2020
    Review Apple Watch Series 6 - Pisapapeles

    The Apple Watch Series 6 acts as a refined evolution of the Series 5, featuring a 20% faster S6 chip, a brighter always-on display, and a new blood oxygen (SpO2) sensor. Key enhancements include an always-on altimeter, improved charging speed (full charge in 90 minutes), and robust native sleep tracking. However, the review notes that the SpO2 sensor lacks clinical validation, and...Read more

    (Translated)Show original
    A
    applesfera.com
    04/11/2020
    Apple Watch Series 6, opiniones y análisis tras 30 días de uso

    According to an analysis on Applesfera, the Apple Watch Series 6 acts as a mature health and lifestyle tool, featuring a 20% faster S6 chip, a 2.5x brighter Always-On display, and faster charging that hits 80% in an hour. Key health capabilities include a 15-second blood oxygen (SpO2) monitor, although these metrics may feel excessive for users not focused on fitness or altitude...Read more

    (Translated)Show original
    I
    it.mashable.com
    05/10/2020
    Apple Watch Series 6, tutte le nuove funzionalità: la nostra prova

    The Mashable review highlights the Apple Watch Series 6 as a refined, slightly faster iteration featuring a brighter Always-On display, new color options, and faster charging, alongside a new, though limited, SpO2 sensor for blood oxygen measurement. Key strengths include the highly responsive S6 chip and improved fitness tracking, while the review notes that blood oxygen data lacks...Read more

    (Translated)Show original
    G
    global.techradar.com
    16/09/2021
    Apple Watch Series 6 Review

    The TechRadar review describes the Apple Watch Series 6 as a refined, high-performance wearable featuring a faster S6 chip, new Blood Oxygen (SpO2) sensor, and a brighter Always-On display. Key improvements include significantly faster charging (0-100% in 90 minutes) and an always-on altimeter, alongside watchOS 7 features like sleep tracking and a hand-washing timer. However, the...Read more

    (Translated)Show original
    R
    riccardo.im
    23/11/2020
    Recensione Apple Watch 6 - Riccardo.im

    In his review, Riccardo Mori highlights the Apple Watch Series 6 as a refined, sophisticated health-monitoring device featuring a 20% faster S6 chip, a brighter Always-On display, and an always-on altimeter. The update brings new color options and materials, marking a polished evolution in the,Apple lineup. Key pros include the new blood oxygen sensor (SpO2), the electrical heart...Read more

    (Translated)Show original
    M
    macitynet.it
    22/09/2020
    Recensione Apple Watch 6, poche novità ma quasi perfetto

    The Macitynet review highlights the Apple Watch Series 6 as a refined evolution of the world's most popular smartwatch, featuring a 2.5x brighter Always-On display, a new S6 processor for faster performance, and a Blood Oxygen (SpO2) sensor. Key pros include the addition of an always-on altimeter, new (PRODUCT)RED and Blue aluminum finishes, and faster charging that hits full...Read more

    (Translated)Show original
    S
    saggiamente.com
    02/10/2020
    Recensione Apple Watch 6 e confronto con SE

    The review highlights the Apple Watch Series 6 as a premium device with a 2.5x brighter Always-On display, faster S6 chip, and advanced health sensors for blood oxygen and ECG. Pros include improved performance and display visibility, while cons are the high price and specialized, non-essential health features for typical users. The Apple Watch SE is identified as a cost-effective...Read more

    (Translated)Show original
    W
    wired.it
    30/09/2020
    Recensione Apple Watch 6, a piccoli passi verso la perfezione

    The Wired Italy review highlights the Apple Watch Series 6 as a refined, faster evolution of its predecessor, featuring a 20% faster S6 chip and a brighter always-on display that improves outdoor visibility. New aesthetic options, including blue and (PRODUCT)RED aluminum cases, are noted as welcome additions to the familiar design. Health capabilities are expanded with a new blood...Read more

    (Translated)Show original
    I
    iphoneitalia.com
    02/10/2020
    Apple Watch Series 6: Our REVIEW

    The iPhoneItalia review describes the Apple Watch Series 6 as a refined, incremental update strengthening Apple's market position with the new S6 SiP chip, which offers 20% faster performance. Key hardware enhancements include a blood oxygen (SpO2) sensor and a significantly brighter Always-On Retina display, which improves outdoor readability by up to 2.5 times. New color options,...Read more

    (Translated)Show original
    I
    icreatemagazine.nl
    06/10/2020
    Eerste indruk Apple Watch Series 6: always-on en altijd om

    The iCreate review characterizes the Apple Watch Series 6 as a refined, top-tier wearable, highlighting the 20% faster S6 processor and a 2.5 times brighter Always-On display. Key health improvements include a blood oxygen (SpO2) sensor for manual and background readings, alongside an always-on altimeter, though sleep tracking remains basic. While praising new color options and...Read more

    (Translated)Show original
    G
    global.techradar.com
    07/10/2020
    Apple Watch 6 review - TechRadar

    The Apple Watch Series 6 is a powerful, incremental upgrade featuring a new blood oxygen (SpO2) sensor and a 20% faster S6 chipset, offering notable improvements like a brighter always-on display and faster charging. The device maintains a 18-24 hour battery life, which often requires daily charging that limits the utility of its native sleep tracking feature. Ultimately, the Watch...Read more

    (Translated)Show original

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