OVERALL
ALTERNATIVES
SPECS
VS AVERAGE
REVIEWS
Scored using Smartwatches Methodology v2.0
Smartwatches Methodology v2.0
Mathematical & Unbiased Scoring
Products in this category are scored under Frontumo Smartwatches Methodology v2.0: technical specifications plus grades from 3,488 independent expert reviews and 5,192 video reviews, with 0% commercial bias.
Explore Smartwatches Methodology v2.0

Xiaomi Watch S4 Review | 126 Data compared

Avg. price:~£140Screen size:1.43 inchBattery life:15 daysDisplay type:AMOLED

Xiaomi Watch S4 Review: Compare 126 technical specifications and 21 expert and video reviews to see how this product ranks in the Smartwatches category and whether it is worth buying.

8.0

Overall score

Score
8.0/ 10
✕
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 distribution
â–¼
<55-66-77-88-99-10
â–² Better than 85% of models
Score components

70%

8.1

Technical score

30%

7.8

Review score ( 9 · 12)

Review score 30% · 7.8 · based on 21 independent reviews
Every model in this category gets the same split: reviews 30%, technical score 70%. This model has enough reviews, so its review score is the weighted average of their grades. 15 more reviews are not scored yet.
â–²Better than 85% of smartwatches
8.1

Technical score

Technical score
8.1/ 10
✕
What it is
An assessment of the smartwatchx27s technical performance, covering seven key areas: health, fitness, display & design, hardware, battery, smart features and connectivity.
When it matters
When you want to compare smartwatches based on technical performance and available features.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 87% of models
Score components

24%

7.6

Health

21%

10

Fitness

16%

7.4

Battery

14%

8.0

Smart features

12%

6.4

Connectivity

9%

8.7

Display & Design

4%

8.3

Hardware

â–²Better than 87% of smartwatches
7.8

Review score

Review score
7.8/ 10
✕
What it is
Average grade from independent test sites, magazines and video reviewers, 1–10.
How we count it
Grades: Each review's own score is converted to 1–10; without one, we grade the review ourselves.
Weighting: Big test sites count more, short reviews half as much as full tests. A video review counts half.
Share: Reviews are 30% of the overall score for every model in this category; each of the 5 needed reviews that is missing counts as 7/10.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 57% of models
Grades by review (21)
9 reviews: 4 with a printed score, 5 estimated from the review. 12 video reviews, each counting half as much as a written test. Share in the overall score: 30%, the same for every model in this category.
Text reviews 5
✓ explicit
3

8.5%

8.0

me.pcmag.com

6.8%

8.0

livescience.com

6.8%

8.0

gadgetvoize.com

≈ estimated
2

6.8%

8.0

racunalniske-novice.com

6.8%

6.0

nasilemaktech.com

Video reviews 3

3.4%

9.0

TechMishka

3.4%

8.0

Tech Spurt

3.4%

6.0

The Product Reviewer

estimated from the review
Shop star ratings are not part of this score.
â–²Better than 57% of smartwatches
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Best prices

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Best rankings

Available: ranking among products currently available (including other versions of this product).All: ranking among all products in the database.
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Technical Specifications of smartwatch Xiaomi Watch S4

Technical score
Technical score
8.1/ 10
✕
What it is
An assessment of the smartwatchx27s technical performance, covering seven key areas: health, fitness, display & design, hardware, battery, smart features and connectivity.
When it matters
When you want to compare smartwatches based on technical performance and available features.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 87% of models
Score components:

24%

7.6

Health

21%

10

Fitness

16%

7.4

Battery

14%

8.0

Smart features

12%

6.4

Connectivity

9%

8.7

Display & Design

4%

8.3

Hardware

8.1
Review score
Review score
7.8/ 10
✕
What it is
Average grade from independent test sites, magazines and video reviewers, 1–10.
How we count it
Grades: Each review's own score is converted to 1–10; without one, we grade the review ourselves.
Weighting: Big test sites count more, short reviews half as much as full tests. A video review counts half.
Share: Reviews are 30% of the overall score for every model in this category; each of the 5 needed reviews that is missing counts as 7/10.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 57% of models
Grades by review (21)
9 reviews: 4 with a printed score, 5 estimated from the review. 12 video reviews, each counting half as much as a written test. Share in the overall score: 30%, the same for every model in this category.
Text reviews 5
✓ explicit
3

8.5%

8.0

me.pcmag.com

6.8%

8.0

livescience.com

6.8%

8.0

gadgetvoize.com

≈ estimated
2

6.8%

8.0

racunalniske-novice.com

6.8%

6.0

nasilemaktech.com

Video reviews 3

3.4%

9.0

TechMishka

3.4%

8.0

Tech Spurt

3.4%

6.0

The Product Reviewer

estimated from the review
Shop star ratings are not part of this score.
7.8
Popularity
Popularity
7.6/ 10
✕
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.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 65% of models
Popularity:
Xiaomi Watch S4 has a popularity of 7.6 points, which is higher than 65.4% of smartwatches.
7.6
Value for money
Value for money
8.6/ 10
✕
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 distribution
â–¼
<55-66-77-88-99-10
★ Better than 93% of models
Score components:

60%

8.0

Overall score

40%

9.8

Price

8.6
Brand name
Xiaomi
Heart rate monitor
yes
Heart rate monitor
yes
â–² Better than 11% of models
This smartwatch includes a heart rate monitor. 10.5% of smartwatches include a heart rate monitor.
Blood oxygen monitoring
yes
Blood oxygen monitoring
yes
â–² Better than 33% of models
This smartwatch supports blood oxygen monitoring. 33.4% of smartwatches support blood oxygen monitoring.
ECG
no
ECG
no
â–¼ Worse than 17% of models
This smartwatch does not support ECG. 16.6% of smartwatches support ECG.
Irregular heart rate warnings
yes
Irregular heart rate warnings
yes
â–² Better than 52% of models
This smartwatch supports irregular heart rate warnings. 51.9% of smartwatches support irregular heart rate warnings.
Show more
What reviewers say
Accelerometer
yes
Accelerometer
yes
â–² Better than 1% of models
This smartwatch includes an accelerometer. 0.6% of smartwatches include an accelerometer.
Barometer
yes
Barometer
yes
â–² Better than 51% of models
This smartwatch includes a barometer. 50.6% of smartwatches include a barometer.
Gyroscope
yes
Gyroscope
yes
â–² Better than 30% of models
This smartwatch includes a gyroscope. 30.2% of smartwatches include a gyroscope.
Cadence sensor
yes
Cadence sensor
yes
â–² Better than 69% of models
This smartwatch includes a cadence sensor. 69% of smartwatches include a cadence sensor.
Distance tracking
yes
Distance tracking
yes
â–² Better than 4% of models
This smartwatch supports distance tracking. 4.1% of smartwatches support distance tracking.
Show more
What reviewers say
Battery life
15 days
Battery life
15 days
â–² Better than 86% of models
Market range: <1 days – >16 days
This smartwatch offers a battery life of 15 days which is longer than that of 86.3% of smartwatches and equal to that of 3.2% of smartwatches.
Battery life in training mode
30 h
Battery life in training mode
30 h
â–² Better than 71% of models
Market range: <5.5 h – >48 h
This smartwatch lasts 30 h in training mode which is longer than 71.4% of smartwatches and equal to that of 5.6% of smartwatches.
Battery life with GPS on
20 h
Battery life with GPS on
20 h
â–¼ Worse than 48% of models
Market range: <5.75 h – >43 h
This smartwatch lasts 20 h with GPS on which is longer than 46.6% of smartwatches and equal to that of 5.6% of smartwatches.
Battery power
486 mAh
Battery power
486 mAh
★ Better than 91% of models
Market range: <195 mAh – >475 mAh
This smartwatch has a battery capacity of 486 mAh which is larger than the batteries in 91.3% of smartwatches and equal to those in 0.2% of smartwatches.
Charge time
?
Show more
What reviewers say
Operating system
HyperOS
Operating system
HyperOS
â–² Better than 59% of models
This smartwatch runs HyperOS which is more advanced than the operating system in 58.8% of smartwatches and the same as that in 1.3% of smartwatches.
Software update frequency
occasional
Software update frequency
occasional
â–² Better than 58% of models
This smartwatch has occasional software update support which is more active than that of 57.6% of smartwatches and equal to that of 36.2% of smartwatches.
Updates are typically released about every 3 months.
Third-party app support
no
Third-party app support
no
â–¼ Worse than 48% of models
This smartwatch does not support third-party apps. 47.7% of smartwatches support third-party apps.
Notifications
yes
Notifications
yes
Category Benchmark
This smartwatch supports notifications. 0.3% of smartwatches support notifications.
Voice assistant support
yes
Voice assistant support
yes
â–² Better than 32% of models
This smartwatch supports voice assistants. 32.4% of smartwatches support voice assistants.
Show more
What reviewers say
Cellular module
no
Cellular module
no
â–¼ Worse than 18% of models
This smartwatch does not include a cellular module. 18% of smartwatches include a cellular module.
SIM cards
0
GPS
yes
GPS
yes
â–² Better than 44% of models
This smartwatch supports GPS. 43.9% of smartwatches support GPS.
Galileo support
yes
Galileo support
yes
â–² Better than 62% of models
This smartwatch supports Galileo navigation. 61.6% of smartwatches support Galileo navigation.
Compass
yes
Compass
yes
â–² Better than 47% of models
This smartwatch includes a compass. 47.5% of smartwatches include a compass.
Show more
What reviewers say
Screen size
1.43 inch
Screen size
1.43 inch
â–² Better than 56% of models
Market range: <1.2 inch – >1.82 inch
This smartwatch has a screen size of 1.43 inch which is larger than the screens of 56.3% of smartwatches and equal to those of 8.2% of smartwatches.
Display type
AMOLED
Display type
AMOLED
â–² Better than 50% of models
This smartwatch uses a AMOLED display type which is more advanced than that of 49.9% of smartwatches and the same as that of 50.1% of smartwatches.
Resolution
466x 466
Resolution
466x 466
â–² Better than 87% of models
This smartwatch has a display resolution of 466x466 which is higher than that of 87.4% of smartwatches and equal to that of 10.9% of smartwatches.
Pixel density
461 ppi
Pixel density
461 ppi
â–² Better than 84% of models
Market range: <207 ppi – >461 ppi
This smartwatch has a pixel density of 461 ppi which is higher than that of 84.5% of smartwatches and equal to that of 6.5% of smartwatches.
Display brightness
2,200 nits
Display brightness
2,200 nits
★ Better than 95% of models
Market range: <450 nits – >2k nits
This smartwatch reaches 2,200 nits of display brightness, which is higher than that of 95% of smartwatches and equal to that of 0.9% of smartwatches.
Show more
What reviewers say
CPU speed
0.5 GHz
CPU speed
0.5 GHz
â–¼ Worse than 73% of models
This smartwatch uses a CPU configuration of 0.5 GHz which is slower than that in 72.8% of smartwatches.
Processor model
?
RAM
?
Internal storage
32 GB
Internal storage
32 GB
â–² Better than 85% of models
Market range: <0 GB – >32 GB
This smartwatch uses 32 GB for internal storage which is larger than that of 84.7% of smartwatches and equal to that of 13.4% of smartwatches.
External memory slot
no
External memory slot
no
Category Benchmark
This smartwatch does not include an external memory slot. 0.3% of smartwatches include an external memory slot.
Show more

Xiaomi Watch S4 vs the average smartwatch

246810TotalHealthFitnessBatteryConnectivityDisplay & DesignSmart featuresHardware
  • 8 days day/s longer battery life
    Battery life
    15 days
    â–² Better than 86% of models
    Market range: <1 days – >16 days
    This smartwatch offers 15 days of battery life, while the average smartwatch offers 7 days.
    15 days vs 7 days
  • Temperature sensing
    Temperature sensor
    yes
    â–² Better than 73% of models
    This smartwatch includes a temperature sensor, the average smartwatch does not. 26.8% of smartwatches include a temperature sensor.
  • Readiness score
    Readiness score
    yes
    â–² Better than 83% of models
    This smartwatch supports readiness scores, the average smartwatch does not. 17.5% of smartwatches support readiness scores.
  • Fall detection
    Fall detection
    yes
    â–² Better than 79% of models
    This smartwatch supports fall detection, the average smartwatch does not. 21.3% of smartwatches support fall detection.
    ski mode / Mi Fitness setup required
  • HRV tracking
    HRV tracking
    yes
    â–² Better than 59% of models
    This smartwatch supports HRV tracking, the average smartwatch does not. 40.8% of smartwatches support HRV tracking.
    HRV may be estimated from sleep/stress methods and not medical-grade.
  • VO2 max measurement
    VO2 max measurement
    yes
    â–² Better than 52% of models
    This smartwatch measures VO2 max, the average smartwatch does not. 47.6% of smartwatches measure VO2 max.
  • Emergency SOS
    Emergency SOS
    yes
    â–² Better than 57% of models
    This smartwatch includes Emergency SOS, the average smartwatch does not. 42.8% of smartwatches include Emergency SOS.
    SOS feature has implementation limits (phone/app/subscription/activity dependent).
  • 1,600 nits higher display brightness
    Display brightness
    2,200 nits
    ★ Better than 95% of models
    Market range: <450 nits – >2k nits
    This smartwatch has higher display brightness than the average smartwatch (2200 nits vs 600 nits). The average smartwatch reaches 600 nits.
    2,200 nits vs 600 nits
  • 13.7% better value for money
    Xiaomi Watch S4 has a higher value-for-money score than the average smartwatch (8.55 vs 7.5).
    8.55 vs 7.52
  • Temperature sensing
    Temperature sensor
    yes
    â–² Better than 73% of models
    This smartwatch includes a temperature sensor, the average smartwatch does not. 26.8% of smartwatches include a temperature sensor.
  • Readiness score
    Readiness score
    yes
    â–² Better than 83% of models
    This smartwatch supports readiness scores, the average smartwatch does not. 17.5% of smartwatches support readiness scores.
  • HRV tracking
    HRV tracking
    yes
    â–² Better than 59% of models
    This smartwatch supports HRV tracking, the average smartwatch does not. 40.8% of smartwatches support HRV tracking.
    HRV may be estimated from sleep/stress methods and not medical-grade.
  • VO2 max measurement
    VO2 max measurement
    yes
    â–² Better than 52% of models
    This smartwatch measures VO2 max, the average smartwatch does not. 47.6% of smartwatches measure VO2 max.
  • Irregular heart rate alerts
    Irregular heart rate warnings
    yes
    â–² Better than 52% of models
    This smartwatch supports irregular heart rate warnings, the average smartwatch does not. 48.1% of smartwatches support irregular heart rate warnings.
  • External heart rate monitor support
    External heart rate monitor compatibility
    yes
    â–² Better than 57% of models
    This smartwatch supports external heart rate monitor compatibility, the average smartwatch does not. 42.7% of smartwatches support external heart rate monitor compatibility.
  • Barometer sensor included
    Barometer
    yes
    â–² Better than 51% of models
    This smartwatch includes a barometer, the average smartwatch does not. 49.5% of smartwatches include a barometer.
  • Cadence tracking
    Cadence sensor
    yes
    â–² Better than 69% of models
    This smartwatch includes a cadence sensor, the average smartwatch does not. 31.1% of smartwatches include a cadence sensor.
  • 70 more exercise profiles
    Multi-sport mode
    150
    â–² Better than 32% of models
    This smartwatch supports more exercise modes than the average smartwatch (150 vs 80). The average smartwatch supports 80 exercise modes.
    Reported as at least 150 exercise modes.
    150 vs 80
  • Route support
    Route support
    yes
    â–² Better than 50% of models
    This smartwatch supports route support, the average smartwatch does not. 50% of smartwatches support route support.
  • 8 days day/s longer battery life
    Battery life
    15 days
    â–² Better than 86% of models
    Market range: <1 days – >16 days
    This smartwatch offers 15 days of battery life, while the average smartwatch offers 7 days.
    15 days vs 7 days
  • 186 mAh larger battery capacity
    Battery life
    486 mAh days
    â–² Better than 86% of models
    Market range: <1 days – >16 days
    This smartwatch has a larger battery capacity than the average smartwatch (486 mAh vs 300 mAh). The average smartwatch battery is 300 mAh.
    486 mAh vs 300 mAh
  • 10.75 h longer training battery life
    Battery life in training mode
    30 h
    â–² Better than 71% of models
    Market range: <5.5 h – >48 h
    This smartwatch lasts longer in training mode than the average smartwatch (30 h vs 19.25 h). The average smartwatch lasts 19.25 h.
    30 h vs 19.25 h
  • NFC functionality
    NFC
    yes
    â–² Better than 57% of models
    This smartwatch supports NFC, the average smartwatch does not. 43.4% of smartwatches support NFC.
    NFC hardware is present, but functionality may be limited by region/app support.
  • Galileo satellite support
    Galileo support
    yes
    â–² Better than 62% of models
    This smartwatch supports Galileo navigation, the average smartwatch does not. 38.5% of smartwatches support Galileo navigation.
  • Newer Bluetooth version
    Bluetooth version
    5.3
    â–² Better than 88% of models
    This smartwatch supports a newer Bluetooth version than the average smartwatch (5.3 vs 5). The average smartwatch uses 5.0.
    5.3 vs 5.0
  • 1,600 nits higher display brightness
    Display brightness
    2,200 nits
    ★ Better than 95% of models
    Market range: <450 nits – >2k nits
    This smartwatch has higher display brightness than the average smartwatch (2200 nits vs 600 nits). The average smartwatch reaches 600 nits.
    2,200 nits vs 600 nits
  • Rugged construction
    Rugged design
    yes
    â–² Better than 62% of models
    This smartwatch has a rugged design, the average smartwatch does not. 37.9% of smartwatches have a rugged design.
  • Stronger display glass
    Display glass type
    Corning Gorilla Glass
    â–² Better than 46% of models
    This smartwatch uses Corning Gorilla Glass display glass, while the average smartwatch uses mineral glass.
    Corning Gorilla Glass vs mineral glass
  • 135 ppi higher pixel density
    Pixel density
    461 ppi
    â–² Better than 84% of models
    Market range: <207 ppi – >461 ppi
    This smartwatch has a higher pixel density than the average smartwatch (461 ppi vs 326 ppi). The average smartwatch display reaches 326 ppi.
    461 ppi vs 326 ppi
  • Better case material
    Case material
    aluminum, stainless steel
    â–² Better than 83% of models
    This smartwatch uses aluminum, stainless steel for the case material, while the average smartwatch uses polycarbonate.
    aluminum alloy middle frame with stainless steel bezel
    aluminum, stainless steel vs polycarbonate
  • Higher resolution
    Display type
    466 x 466
    â–² Better than 50% of models
    This smartwatch has a display resolution of 466x466, while the average smartwatch reaches 352x430.
    466x466 vs 352x430
  • Better band material
    Band material
    silicone, rubber, leather, nylon, stainless steel
    â–² Better than 85% of models
    This smartwatch uses silicone, rubber, leather, nylon, stainless steel for the band material, while the average smartwatch uses silicone.
    silicone, rubber, leather, nylon, stainless steel vs silicone
  • Fall detection
    Fall detection
    yes
    â–² Better than 79% of models
    This smartwatch supports fall detection, the average smartwatch does not. 21.3% of smartwatches support fall detection.
    ski mode / Mi Fitness setup required
  • Emergency SOS
    Emergency SOS
    yes
    â–² Better than 57% of models
    This smartwatch includes Emergency SOS, the average smartwatch does not. 42.8% of smartwatches include Emergency SOS.
    SOS feature has implementation limits (phone/app/subscription/activity dependent).
  • More frequent updates
    Software update frequency
    occasional
    â–² Better than 58% of models
    This smartwatch receives occasional software updates, while the average smartwatch receives ended updates.
    Updates are typically released about every 3 months.
    occasional vs ended
  • More advanced operating system
    Operating system
    HyperOS
    â–² Better than 59% of models
    This smartwatch runs a more advanced operating system than the average smartwatch (HyperOS vs Proprietary OS).
    HyperOS vs Proprietary OS
  • 28 GB more storage
    Internal storage
    32 GB
    â–² Better than 85% of models
    Market range: <0 GB – >32 GB
    This smartwatch 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
  • 3 year/s newer release date
    Release date
    2024
    â–² Better than 88% of models
    Market range: <2k – >2k
    This smartwatch has a newer release date than the average smartwatch (2024 vs 2021). The average smartwatch was released in 2021.
    October 2024
    2024 vs 2021
  • No smart scale support
    Smart scale compatibility
    no
    â–¼ Worse than 54% of models
    This smartwatch does not support smart scale compatibility, the average smartwatch does. 53.7% of smartwatches support smart scale compatibility.
  • Basic battery type
    Battery type
    Li-ion
    â–¼ Worse than 51% of models
    This smartwatch uses a Li-ion battery, while the average smartwatch uses Li-Po.
    Li-ion vs Li-Po
  • No voice feedback
    Voice feedback
    no
    â–¼ Worse than 62% of models
    This smartwatch does not support voice feedback, the average smartwatch does. 61.9% of smartwatches support voice feedback.
  • 5.3 mm wider watch width
    Width
    47.3 mm
    â–¼ Worse than 94% of models
    Market range: <34.6 mm – >46.8 mm
    This smartwatch is wider than the average smartwatch (47.3 mm vs 42 mm). The average smartwatch width is 42.0 mm.
    47.3 mm vs 42.0 mm
  • 2.3 mm taller watch height
    Height
    47.3 mm
    â–¼ Worse than 78% of models
    Market range: <39.5 mm – >51 mm
    This smartwatch is taller than the average smartwatch (47.3 mm vs 45 mm). The average smartwatch height is 45 mm.
    47.3 mm vs 45 mm
  • 0.4 mm thicker watch body
    Thickness
    12 mm
    â–¼ Worse than 56% of models
    Market range: <9.8 mm – >14.1 mm
    This smartwatch is thicker than the average smartwatch (12 mm vs 11.6 mm). The average smartwatch thickness is 11.6 mm.
    12 mm vs 11.6 mm
  • Slower CPU speed
    CPU speed
    0.5 GHz
    â–¼ Worse than 73% of models
    This smartwatch uses a CPU configuration of 0.5 GHz, while the average smartwatch uses 1 GHz.
    0.5 GHz vs 1 GHz
  • No smart scale support
    Smart scale compatibility
    no
    â–¼ Worse than 54% of models
    This smartwatch does not support smart scale compatibility, the average smartwatch does. 53.7% of smartwatches support smart scale compatibility.
  • No voice feedback
    Voice feedback
    no
    â–¼ Worse than 62% of models
    This smartwatch does not support voice feedback, the average smartwatch does. 61.9% of smartwatches support voice feedback.
  • Basic battery type
    Battery type
    Li-ion
    â–¼ Worse than 51% of models
    This smartwatch uses a Li-ion battery, while the average smartwatch uses Li-Po.
    Li-ion vs Li-Po
  • 5.3 mm wider watch width
    Width
    47.3 mm
    â–¼ Worse than 94% of models
    Market range: <34.6 mm – >46.8 mm
    This smartwatch is wider than the average smartwatch (47.3 mm vs 42 mm). The average smartwatch width is 42.0 mm.
    47.3 mm vs 42.0 mm
  • 2.3 mm taller watch height
    Height
    47.3 mm
    â–¼ Worse than 78% of models
    Market range: <39.5 mm – >51 mm
    This smartwatch is taller than the average smartwatch (47.3 mm vs 45 mm). The average smartwatch height is 45 mm.
    47.3 mm vs 45 mm
  • 0.4 mm thicker watch body
    Thickness
    12 mm
    â–¼ Worse than 56% of models
    Market range: <9.8 mm – >14.1 mm
    This smartwatch is thicker than the average smartwatch (12 mm vs 11.6 mm). The average smartwatch thickness is 11.6 mm.
    12 mm vs 11.6 mm
  • Slower CPU speed
    CPU speed
    0.5 GHz
    â–¼ Worse than 73% of models
    This smartwatch uses a CPU configuration of 0.5 GHz, while the average smartwatch uses 1 GHz.
    0.5 GHz vs 1 GHz

Video reviews

Hands-on testing, unboxing, and real-world video evaluations

6.0
The Product Reviewer
≈ estimated
07/03/2025
Hands-on review · features, health and GPS tests
Verdict
Xiaomi Watch S4 feels premium and has many features, but its GPS accuracy and sports suitability are weak.
8.0
Tech Spurt
≈ estimated
06/03/2025
Hands-on review · about two weeks of use
Verdict
Xiaomi Watch S4 is a good all-round smartwatch for casual users, though not for serious GPS or fitness tracking.
9.0
TechMishka
≈ estimated
06/03/2025
Hands-on review · battery, health and app tests
Verdict
Xiaomi Watch S4 is a very good smartwatch to consider in 2025, with strong battery life and a stylish design.
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What reviewers agree on

Based on 9 · 12

Reviewers praise the customisation, display and battery life, but notifications and voice controls disappoint, and GPS gets mixed reactions.
Praised
Mixed views
Criticised
Pick a topic to see who said what

Expert reviews

In-depth analysis and verdict from leading tech publications

t3.com
05/03/2025
Not graded yet
wareable.com
07/10/2025
Not graded yet
cgmagonline.com
01/04/2025
Not graded yet
smartwatchcentral.co.uk
05/01/2026
Not graded yet
gadgetsandwearables.com
02/03/2025
Not graded yet
8.0
livescience.com
✓ explicit
27/02/2026
Two-month test · Health tracking
Verdict
The Xiaomi Watch S4 is an elegant, highly customizable everyday watch with accurate sleep tracking, but serious exercisers will find its workout data too basic.
8.0
me.pcmag.com
✓ explicit
27/02/2026
Few-week test · Battery life
Verdict
The Xiaomi Watch S4 is a stylish, sturdy health tracker, but Bluetooth calls only work in a very quiet room and it lasts about six days, not 15.
8.0
racunalniske-novice.com
≈ estimated
27/02/2026
Hands-on test · Replaceable bezel
Verdict
The Xiaomi Watch S4 is a solid, waterproof running watch with a swappable bezel, but its 47mm case feels large on the wrist and it has no app store.
8.0
gadgetvoize.com
✓ explicit
16/11/2025
Hands-on review · Fitness tracking
Verdict
The Xiaomi Watch S4 41mm is a compact all-round watch with about three days of battery and detailed health tracking, though it has no third-party voice assistant.
chip.de
08/07/2025
Not graded yet
heise.de
17/08/2025
Not graded yet
connect.de
25/03/2025
Not graded yet
6.0
smartzone.de
≈ estimated
31/12/2025
Four-week test · Compact design
Verdict
The Xiaomi Watch S4 41mm suits slim wrists and a tidy look, but it can't reply to messages and its brightness adjusts slowly.
7.0
nerdsheaven.de
≈ estimated
30/10/2025
Hands-on test · Health tracking
Verdict
The Xiaomi Watch S4 suits fans of swappable bezels and reliable heart tracking, but it can't reply to messages and lasts about 4.5 days with all tracking on, not 15.
lesnumeriques.com
12/03/2025
Not graded yet
journaldugeek.com
12/05/2025
Not graded yet
frandroid.com
05/10/2025
Not graded yet
9.0
smartwatchcentral.co.uk
✓ explicit
05/01/2026
Hands-on review · Thin-wrist design
Verdict
The Xiaomi Watch S4 41mm suits thinner wrists with its sharp, well-built design, but it lasted 4 days in testing, not the 8 advertised.
frandroid.com
24/06/2025
Not graded yet
01net.com
24/03/2025
Not graded yet
racunalniske-novice.com
24/03/2025
Not graded yet

Third-party reviews

Read buyer reviews on Amazon →

What we like about Xiaomi Watch S4

  • Premium build quality and stylish design that punches above its budget price point
  • Unique interchangeable bezel system and standard 22mm straps allow for extensive physical customisation
  • Bright and vibrant AMOLED display (up to 2200 nits) ensures excellent visibility even in direct sunlight
  • Smooth and responsive user experience powered by Xiaomi's HyperOS
  • Excellent battery life, typically lasting around one week with moderate to heavy usage, outperforming many competitors
  • Reliable heart rate monitoring that performs well even during high-intensity gym sessions

What we don't like about Xiaomi Watch S4

  • Limited notification functionality with no support for emojis or direct replies
  • Lack of a third-party app store and limited support for popular services like Spotify or WhatsApp
  • Inconsistent sleep tracking that frequently overestimates deep sleep duration
  • Restrictive NFC payment ecosystem with very limited bank compatibility in most regions
  • GNSS/GPS performance can be inconsistent, particularly in dense urban environments
  • Automatic brightness sensor can be overly conservative or buggy indoors

Verdict

The Xiaomi Watch S4 is a premium-styled smartwatch featuring a 1.43-inch AMOLED display with a 60Hz refresh rate and a peak brightness of 2200 nits, housed in an aluminum alloy frame with a stainless steel rotating crown and unique interchangeable bezels. It runs on Xiaomi HyperOS 2, offering over 150 sports modes, dual-frequency GNSS (GPS, Galileo, Glonass, BeiDou, QZSS), and a 486mAh battery that provides up to 15 days of typical usage. Key pros include its highly customizable design, an exceptionally bright and crisp display, and an upgraded heart rate sensor with a reported 98.2% accuracy. However, its main cons are a 'closed' operating system that lacks third-party app support (such as Spotify), limited notification interactivity with no ability to reply to messages, and NFC payment functionality that is restricted to specific regions and banks.

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