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MyKronoz ZeFit4 HR Review | 171 Data compared

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  • Avg. price: ~£20
  • Form factor: watch
  • Battery life: 5 days
  • Screen size: 1.06 inch

MyKronoz ZeFit4 HR review. Compare 171 technical specifications and user reviews to see how it ranks among fitness trackers and if it is worth buying.

6.5

Overall score

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

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

Score components:

80.0%

6.6

Technical Score

20.0%

6.2

User score

Good
6.6

Technical Score

What it is: An assessment of the fitness tracker's technical performance, covering eight key areas: health tracking, sports features, connectivity, display, battery, smart features, design, and app support.

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

Score components:

20.0%

7.6

Sports & Navigation

20.0%

4.2

Battery

18.0%

7.6

Health

18.0%

5.4

Display

8.0%

8.2

Smart Features

8.0%

7.8

App & Wellness

4.0%

7.2

Connectivity

4.0%

8.6

Design & Durability

Good
6.2

User score

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

When it matters: When you want to know how a fitness tracker performs in daily use and how reliable it remains over time according to user feedback.

Score components:

70.0%

6.1

User reviews

30.0%

6.6

Popularity

User score:
United Kingdom
amazon
3.1
(76)
amazon
2.7
(16)
amazon
3.2
(3)

(Reviews last updated: Jun 2026)

Good
  • 6.0
    Swimming

    Score components:

    28.0%

    9.0

    ATM rating

    24.0%

    4.0

    Open-water swim mode

    18.0%

    9.0

    Waterproof depth rating

    15.0%

    4.0

    GPS

    15.0%

    2.0

    Battery life

  • 6.7
    Kids

    Score components:

    30.0%

    2.0

    Battery life

    25.0%

    9.6

    Weight

    20.0%

    9.0

    ATM rating

    15.0%

    5.8

    Screen size

    10.0%

    10

    Price

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Best prices in UK

Best rankings

?

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

Verdict

The MyKronoz ZeFit4 HR is a lightweight (17g) fitness tracker featuring a 1.06-inch TFT color touchscreen (160x64 pixels) and a 3-axis accelerometer for tracking steps, distance, calories, and sleep. Its main characteristics include an integrated optical heart rate sensor for real-time monitoring, IP67 water resistance, and an 80mAh battery providing up to 5 days of standby time on a 1.5-hour charge. Key pros include its slim 9.3mm design, aluminum frame, and smart features like inactivity alerts, remote camera/music control, and notifications for calls, emails, and social media. However, some users have noted cons such as the limited 7-day on-device activity memory and a relatively low display resolution compared to newer competitors.

Technical Specifications of MyKronoz ZeFit4 HR

Technical Score

What it is: An assessment of the fitness tracker's technical performance, covering eight key areas: health tracking, sports features, connectivity, display, battery, smart features, design, and app support.

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

Score components:

20.0%

7.6

Sports & Navigation

20.0%

4.2

Battery

18.0%

7.6

Health

18.0%

5.4

Display

8.0%

8.2

Smart Features

8.0%

7.8

App & Wellness

4.0%

7.2

Connectivity

4.0%

8.6

Design & Durability

6.6
MyKronoz ZeFit4 HR has a technical score of 6.61 points, which is lower than 68.1% of fitness trackers.
User score

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

When it matters: When you want to know how a fitness tracker performs in daily use and how reliable it remains over time according to user feedback.

Score components:

70.0%

6.1

User reviews

30.0%

6.6

Popularity

User score:
United Kingdom
amazon
3.1
(76)
amazon
2.7
(16)
amazon
3.2
(3)

(Reviews last updated: Jun 2026)

6.2
MyKronoz ZeFit4 HR has a user score of 6.24 points, which is lower than 93% of fitness trackers.
Popularity
What it is: An indicator based on the number of reviews received by the fitness tracker.
When it matters: When you prefer to buy a product chosen and reviewed by many other consumers.
6.6
MyKronoz ZeFit4 HR has a popularity of 6.6 points, which is higher than 53.5% of products in this category.
Ratio quality/price

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

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

Score components:

60.0%

6.5

Overall score

40.0%

10

Price

7.6
MyKronoz ZeFit4 HR has a quality-to-price ratio of 7.6 points, which is lower than 66.2% of products in this category.
Heart rate monitor
What it is: Sensor that measures heart rate in real time.
When it matters: When you care about live heart-rate feedback during training or resting trends outside of workouts.

Importance: HIGH

yes
MyKronoz ZeFit4 HR supports heart rate monitoring. 40.2% of fitness trackers support heart rate monitoring.
Resting heart rate
What it is: Measures heart rate while resting.
When it matters: When deeper insight into sleep quality, recovery, or overall readiness matters more than raw numbers alone.

Importance: MEDIUM

no
MyKronoz ZeFit4 HR does not support Resting heart rate. 48.5% of fitness trackers support Resting heart rate.
Fast/slow heart rate alerts
What it is: Alerts for heart rates that are too fast or too slow.
When it matters: When you want the tracker to warn you about unusual changes instead of only logging them.

Importance: LOW

yes
MyKronoz ZeFit4 HR supports high and low heart rate alerts. 66.8% of fitness trackers support high and low heart rate alerts.
High heart rate alert only.
Irregular heart rate alerts
What it is: Warns of irregular or abnormal heart rhythms.
When it matters: When you want the tracker to warn you about unusual changes instead of only logging them.

Importance: LOW

no
MyKronoz ZeFit4 HR does not support irregular heart rate alerts. 11.5% of fitness trackers support irregular heart rate alerts.
Blood oxygen sensor
What it is: Sensor that measures blood oxygen saturation.
When it matters: When blood oxygen readings are part of the health picture you want from the device instead of relying on heart rate and step count alone.

Importance: MEDIUM

no
MyKronoz ZeFit4 HR does not have a blood oxygen sensor. 26.1% of fitness trackers have a blood oxygen sensor.
Show more
GPS
What it is: Satellite navigation capability for positioning and tracking.
When it matters: When you train outdoors and want pace, distance, and route tracking without depending completely on your phone.

Importance: LOW

no
MyKronoz ZeFit4 HR does not have GPS. 11% of fitness trackers have GPS.
Satellite systems supported
What it is: States which satellite navigation systems the device can use for positioning.
When it matters: When you train outdoors and want stronger positioning, route guidance, and navigation independence from your phone.

Importance: LOW

no
MyKronoz ZeFit4 HR supports no satellite systems which is less versatile than that of 12.2% of fitness trackers and the same as that of 87.8% of fitness trackers.
GNSS bands supported
What it is: Number and type of GNSS frequency bands supported.
When it matters: When you train outdoors and want stronger positioning, route guidance, and navigation independence from your phone.

Importance: LOW

no
MyKronoz ZeFit4 HR does not support advanced GNSS bands. 8.9% of fitness trackers support advanced GNSS bands.
Galileo support
What it is: Supports Galileo satellite system.
When it matters: When you train outdoors and want stronger positioning, route guidance, and navigation independence from your phone.

Importance: LOW

no
MyKronoz ZeFit4 HR does not support Galileo. 4.9% of fitness trackers support Galileo.
Acquires GPS faster
What it is: Shows whether the tracker includes features that help it lock onto satellite positioning more quickly at the start of an outdoor activity.
When it matters: When you train outdoors and want stronger positioning, route guidance, and navigation independence from your phone.

Importance: LOW

no
MyKronoz ZeFit4 HR does not support faster GPS acquisition. 7.2% of fitness trackers support faster GPS acquisition.
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Notifications
What it is: Delivers smartphone notifications on the watch.
When it matters: When getting calls, messages, and app alerts on your wrist saves you from checking your phone constantly.

Importance: MEDIUM

yes
MyKronoz ZeFit4 HR supports notifications. 27.5% of fitness trackers support notifications.
Vibrating alerts
What it is: Provides vibration-based notifications and alerts.
When it matters: When staying reachable from your wrist helps you avoid checking your phone constantly.

Importance: LOW

yes
MyKronoz ZeFit4 HR supports vibration alerts. 16.3% of fitness trackers support vibration alerts.
Call control
What it is: Allows control of phone calls from the device.
When it matters: When staying reachable from your wrist helps you avoid checking your phone constantly.

Importance: LOW

?
Call answering
What it is: Allows answering calls directly from the device.
When it matters: When staying reachable from your wrist helps you avoid checking your phone constantly.

Importance: LOW

no
MyKronoz ZeFit4 HR does not support call answering. 1% of fitness trackers support call answering.
Calendar sync
What it is: Syncs calendar events with the connected device.
When it matters: When staying reachable from your wrist helps you avoid checking your phone constantly.

Importance: LOW

no
MyKronoz ZeFit4 HR does not support calendar sync. 19.9% of fitness trackers support calendar sync.
Show more
Activity reports
What it is: Generates summaries and insights from activity data.
When it matters: When you want the app to motivate you with goals, reports, coaching, or progress feedback over time.

Importance: LOW

yes
MyKronoz ZeFit4 HR supports activity reports. 5.7% of fitness trackers support activity reports.
Goal setting
What it is: Allows setting personal fitness or activity goals.
When it matters: When you want the app to motivate you with goals, reports, coaching, or progress feedback over time.

Importance: LOW

yes
MyKronoz ZeFit4 HR supports goal setting. 2.4% of fitness trackers support goal setting.
Achievements
What it is: Rewards progress and completed milestones.
When it matters: When you want the app to motivate you with goals, reports, coaching, or progress feedback over time.

Importance: LOW

no
MyKronoz ZeFit4 HR does not support achievements. 76.2% of fitness trackers support achievements.
Inactivity alerts
What it is: Alerts when the user has been inactive for too long.
When it matters: When account rules, app costs, exports, or software flexibility affect whether the ecosystem suits you long term.

Importance: LOW

yes
MyKronoz ZeFit4 HR supports inactivity alerts. 23.7% of fitness trackers support inactivity alerts.
Coaching
What it is: Provides guided training and workout advice.
When it matters: When you want the app to motivate you with goals, reports, coaching, or progress feedback over time.

Importance: LOW

no
MyKronoz ZeFit4 HR does not support coaching. 33% of fitness trackers support coaching.
Show more
Bluetooth version
What it is: Version of Bluetooth supported by the device.
When it matters: When wireless stability, pairing quality, and long-term phone compatibility matter more than Bluetooth being a simple checkbox.

Importance: LOW

Good value: >=5.0

4.0
MyKronoz ZeFit4 HR supports Bluetooth 4.0 which is newer than in 5.1% of fitness trackers and equal to that in 51.5% of fitness trackers.
Maximum Bluetooth range
What it is: States the maximum Bluetooth connection range supported under normal conditions.
When it matters: When compatibility with your phone, computer, accessories, or wireless setup affects how well the tracker fits into your ecosystem.

Importance: LOW

Good value: >=10 m

5 m
MyKronoz ZeFit4 HR offers a Bluetooth range of 5 m which is lower than that of 96.2% of fitness trackers and equal to that of 2.3% of fitness trackers.
NFC
What it is: Supports near-field communication for contactless features.
When it matters: When compatibility with your phone, computer, accessories, or wireless setup affects how well the tracker fits into your ecosystem.

Importance: LOW

no
MyKronoz ZeFit4 HR does not have NFC. 10.1% of fitness trackers have NFC.
Wi-Fi connectivity
What it is: Connects to wireless internet networks.
When it matters: When the tracker should sync, update, or download data directly without always routing everything through the phone.

Importance: LOW

?
Wi-Fi version
What it is: Version of Wi-Fi standard supported.
When it matters: When compatibility with your phone, computer, accessories, or wireless setup affects how well the tracker fits into your ecosystem.

Importance: LOW

no
MyKronoz ZeFit4 HR does not support modern Wi-Fi. 1% of fitness trackers support modern Wi-Fi.
no Wi-Fi support.
Show more
Battery life
What it is: Total time the battery lasts on a full charge.
When it matters: When the tracker needs to last through travel, sleep tracking, long workouts, or several days between charges.

Importance: HIGH

Good value: >5 days

5 days
MyKronoz ZeFit4 HR offers a battery life of 5 days which is shorter than that of 79.2% of fitness trackers and equal to that of 12.4% of fitness trackers.
Battery life with GPS on
What it is: Battery duration when GPS tracking is active.
When it matters: When you want fewer charging breaks during travel, longer workouts, sleep tracking, or continuous use.

Importance: LOW

Good value: >=8 hours

N/A
Battery life in training mode
What it is: Battery duration during active training sessions.
When it matters: When you want fewer charging breaks during travel, longer workouts, sleep tracking, or continuous use.

Importance: LOW

?
Battery life in power-saving mode
What it is: Battery duration when using power-saving mode.
When it matters: When you want fewer charging breaks during travel, longer workouts, sleep tracking, or continuous use.

Importance: LOW

?
Battery capacity
What it is: Energy storage capacity of the battery.
When it matters: When you want rough battery context behind the runtime claim instead of trusting the advertised hours alone.

Importance: MEDIUM

Good value: >=100 mAh

80 mAh
MyKronoz ZeFit4 HR has a battery capacity of 80 mAh which is lower than that of 70.4% of fitness trackers and equal to that of 0.7% of fitness trackers.
Show more
Display
What it is: Main interface showing information and metrics.
When it matters: When easier reading at a glance and better day-to-day screen comfort matter to you.

Importance: LOW

yes
MyKronoz ZeFit4 HR has a display. 24.1% of fitness trackers have a display.
Built-in touch display.
Screen size
What it is: Physical size of the device’s display measured diagonally.
When it matters: When easier reading at a glance and better day-to-day screen comfort matter to you.

Importance: MEDIUM

1.06 inch
MyKronoz ZeFit4 HR has a screen size of 1.06 inch which is larger than that of 51.8% of fitness trackers and equal to that of 0.7% of fitness trackers.
Display type
What it is: Technology used for the screen, such as AMOLED or LCD.
When it matters: When display technology affects contrast, color quality, power efficiency, or how premium the screen feels.

Importance: MEDIUM

TFT LCD
MyKronoz ZeFit4 HR uses TFT LCD display technology which is less advanced than that of 61.4% of fitness trackers and the same as that of 5.5% of fitness trackers.
Screen resolution
What it is: Total number of pixels displayed on the screen.
When it matters: When easier reading at a glance and better day-to-day screen comfort matter to you.

Importance: MEDIUM

128 x 80
MyKronoz ZeFit4 HR has a screen resolution of 128x80 which is higher than that of 57.4% of fitness trackers and equal to that of 1.1% of fitness trackers.
Pixel density
What it is: Number of pixels per inch determining screen sharpness.
When it matters: When easier reading at a glance and better day-to-day screen comfort matter to you.

Importance: LOW

Good value: >=280 ppi

163 ppi
MyKronoz ZeFit4 HR has a pixel density of 163 ppi which is lower than that of 82.4% of fitness trackers and equal to that of 2% of fitness trackers.
Show more
Form factor
What it is: Overall physical design and shape.
When it matters: When materials, shape, and build details affect comfort, durability, or how discreet the device feels.

Importance: LOW

watch
Hybrid design
What it is: Combines analog and digital display elements.
When it matters: When materials, shape, and build details affect comfort, durability, or how discreet the device feels.

Importance: LOW

no
MyKronoz ZeFit4 HR does not support Hybrid design. 2.4% of fitness trackers support Hybrid design.
Designed for kids
What it is: Indicates whether the fitness tracker is explicitly designed for children, with child-focused sizing, branding, safety limits, or kid-oriented activity features.
When it matters: This matters when you want a tracker that is genuinely child-focused rather than just a smaller adult model.

Importance: LOW

no
MyKronoz ZeFit4 HR is not designed for kids. 2.4% of fitness trackers are designed for kids.
No child-specific positioning found.
Replaceable watch band
What it is: Ability to replace the wristband with other styles.
When it matters: When strap comfort, fit, or the ability to swap bands matters for sport, style, or replacement.

Importance: LOW

yes
MyKronoz ZeFit4 HR has a replaceable watch band. 24.4% of fitness trackers have a replaceable watch band.
Quick-release band system.
Band width
What it is: Width of the strap where it connects to the watch.
When it matters: When strap comfort, fit, or the ability to swap bands matters for sport, style, or replacement.

Importance: LOW

16 mm
Show more

MyKronoz ZeFit4 HR vs the average fitness tracker

  • Touchscreen
    MyKronoz ZeFit4 HR has a touchscreen, while the average fitness tracker does not. 43.8% of fitness trackers have a touchscreen.
    What it is: Ability of the display to recognize touch input.
    When it matters: When smooth touch response and quicker on-screen interaction matter during workouts or daily use.

    Importance: LOW

    MyKronoz ZeFit4 HR has a touchscreen, while the average fitness tracker does not. 43.8% of fitness trackers have a touchscreen.
  • Heart rate alerts
    MyKronoz ZeFit4 HR supports high and low heart rate alerts, while the average fitness tracker does not. 33.5% of fitness trackers support high and low heart rate alerts.
    High heart rate alert only.
    What it is: Alerts for heart rates that are too fast or too slow.
    When it matters: When you want the tracker to warn you about unusual changes instead of only logging them.

    Importance: LOW

    MyKronoz ZeFit4 HR supports high and low heart rate alerts, while the average fitness tracker does not. 33.5% of fitness trackers support high and low heart rate alerts.
  • Phone finder support
    MyKronoz ZeFit4 HR supports phone finding, while the average fitness tracker does not. 49.5% of fitness trackers support phone finding.
    What it is: Helps locate a connected smartphone.
    When it matters: When staying reachable from your wrist helps you avoid checking your phone constantly.

    Importance: LOW

    MyKronoz ZeFit4 HR supports phone finding, while the average fitness tracker does not. 49.5% of fitness trackers support phone finding.
  • Color display
    MyKronoz ZeFit4 HR has a color display, while the average fitness tracker does not. 37.9% of fitness trackers have a color display.
    What it is: Displays full color visuals.
    When it matters: When display technology affects contrast, color quality, power efficiency, or how premium the screen feels.

    Importance: LOW

    MyKronoz ZeFit4 HR has a color display, while the average fitness tracker does not. 37.9% of fitness trackers have a color display.
  • Branded damage-resistant glass
    MyKronoz ZeFit4 HR uses branded damage-resistant glass, while the average fitness tracker does not. 22.2% of fitness trackers use branded damage-resistant glass.
    Corning Gorilla Glass.
    What it is: Shows whether the display uses a named reinforced glass brand instead of unspecified screen protection.
    When it matters: When scratch resistance and long-term display protection matter for everyday wear.

    Importance: LOW

    MyKronoz ZeFit4 HR uses branded damage-resistant glass, while the average fitness tracker does not. 22.2% of fitness trackers use branded damage-resistant glass.
  • 32% lighter
    MyKronoz ZeFit4 HR is lighter than the average fitness tracker (17 g vs 25 g). The average fitness tracker weighs 25 g.
    What it is: Weight of the device including strap.
    When it matters: When overall size, thickness, or weight affects comfort during all-day wear, sleep, or exercise.

    Importance: LOW

    Good value: <25 g

    MyKronoz ZeFit4 HR is lighter than the average fitness tracker (17 g vs 25 g). The average fitness tracker weighs 25 g.17 g vs 25 g
  • 3.5x cheaper
    MyKronoz ZeFit4 HR is cheaper than the average fitness tracker (£20 vs £70).
    MyKronoz ZeFit4 HR is cheaper than the average fitness tracker (£20 vs £70).£20 vs £70
  • Camera remote control
    MyKronoz ZeFit4 HR supports camera remote control, while the average fitness tracker does not. 38.6% of fitness trackers support camera remote control.
    What it is: Lets the watch control the smartphone camera remotely.
    When it matters: When you want to trigger the phone camera remotely for selfies, group shots, or setup photos.

    Importance: LOW

    MyKronoz ZeFit4 HR supports camera remote control, while the average fitness tracker does not. 38.6% of fitness trackers support camera remote control.
  • Heart rate alerts
    MyKronoz ZeFit4 HR supports high and low heart rate alerts, while the average fitness tracker does not. 33.5% of fitness trackers support high and low heart rate alerts.
  • Touchscreen
    MyKronoz ZeFit4 HR has a touchscreen, while the average fitness tracker does not. 43.8% of fitness trackers have a touchscreen.
  • Color display
    MyKronoz ZeFit4 HR has a color display, while the average fitness tracker does not. 37.9% of fitness trackers have a color display.
  • Branded damage-resistant glass
    MyKronoz ZeFit4 HR uses branded damage-resistant glass, while the average fitness tracker does not. 22.2% of fitness trackers use branded damage-resistant glass.
  • Phone finder support
    MyKronoz ZeFit4 HR supports phone finding, while the average fitness tracker does not. 49.5% of fitness trackers support phone finding.
  • Camera remote control
    MyKronoz ZeFit4 HR supports camera remote control, while the average fitness tracker does not. 38.6% of fitness trackers support camera remote control.
  • 32% lighter
    MyKronoz ZeFit4 HR is lighter than the average fitness tracker (17 g vs 25 g). The average fitness tracker weighs 25 g.
  • 1.2 mm thinner design
    MyKronoz ZeFit4 HR is thinner than the average fitness tracker (9.8 mm vs 11 mm). The average fitness tracker has a thickness of 11 mm.

Total
Overall
Health
Display
Smart Features
Design & Durability
  • No pace measurement
    MyKronoz ZeFit4 HR does not support pace measurement, while the average fitness tracker does. 61.3% of fitness trackers support pace measurement.
  • 5 days shorter battery life
    MyKronoz ZeFit4 HR has a lower battery life than the average fitness tracker (5 days vs 10 days). The average fitness tracker has 10 days of battery life.
  • 27.3% smaller battery capacity
    MyKronoz ZeFit4 HR has a lower battery capacity than the average fitness tracker (80 mAh vs 110 mAh). The average fitness tracker has 110 mAh of battery capacity.
  • Lower screen resolution
    MyKronoz ZeFit4 HR has a lower screen resolution than the average fitness tracker (128x80 vs 194x368). The average fitness tracker has a screen resolution of 194x368.
  • 33.3% lower screen brightness
    MyKronoz ZeFit4 HR has a lower screen brightness than the average fitness tracker (300 nits vs 450 nits). The average fitness tracker has screen brightness of 450 nits.
  • 34% lower pixel density
    MyKronoz ZeFit4 HR has a lower pixel density than the average fitness tracker (163 ppi vs 247 ppi). The average fitness tracker has a pixel density of 247 ppi.
  • 5 m shorter Bluetooth range
    MyKronoz ZeFit4 HR has a shorter Bluetooth range than the average fitness tracker (5 m vs 10 m). The average fitness tracker offers a Bluetooth range of 10 m.
  • Limited ip rating
    MyKronoz ZeFit4 HR has a lower IP rating than the average fitness tracker (IP67 vs IP68). The average fitness tracker has an IP rating of IP68.
  • 4.7 mm greater height
    MyKronoz ZeFit4 HR is taller than the average fitness tracker (45.5 mm vs 40.8 mm). The average fitness tracker has a height of 40.8 mm.
  • 20 °C higher minimum operating temperature
    MyKronoz ZeFit4 HR has a higher minimum operating temperature than the average fitness tracker (-20 °C vs 0 °C). The average fitness tracker supports a minimum operating temperature of 0 °C.
  • No weight tracking
    MyKronoz ZeFit4 HR does not support weight tracking, while the average fitness tracker does. 81.3% of fitness trackers support weight tracking.
  • No BMI tracking
    MyKronoz ZeFit4 HR does not support BMI tracking, while the average fitness tracker does. 71% of fitness trackers support BMI tracking.
  • No achievements
    MyKronoz ZeFit4 HR does not support achievements, while the average fitness tracker does. 75.8% of fitness trackers support achievements.
  • Ads in app
    MyKronoz ZeFit4 HR shows ads in the app, while the average fitness tracker does not. 50.6% of fitness trackers have an ad-free app.
  • 5 days shorter battery life
    MyKronoz ZeFit4 HR has a lower battery life than the average fitness tracker (5 days vs 10 days). The average fitness tracker has 10 days of battery life.
    What it is: Total time the battery lasts on a full charge.
    When it matters: When the tracker needs to last through travel, sleep tracking, long workouts, or several days between charges.

    Importance: HIGH

    Good value: >5 days

    MyKronoz ZeFit4 HR has a lower battery life than the average fitness tracker (5 days vs 10 days). The average fitness tracker has 10 days of battery life.5 days vs 10 days
  • No pace measurement
    MyKronoz ZeFit4 HR does not support pace measurement, while the average fitness tracker does. 61.3% of fitness trackers support pace measurement.
    What it is: Measures running or walking speed.
    When it matters: When you want the tracker to capture more workouts and training details with less manual effort.

    Importance: MEDIUM

    MyKronoz ZeFit4 HR does not support pace measurement, while the average fitness tracker does. 61.3% of fitness trackers support pace measurement.
  • Lower screen resolution
    MyKronoz ZeFit4 HR has a lower screen resolution than the average fitness tracker (128x80 vs 194x368). The average fitness tracker has a screen resolution of 194x368.
    What it is: Total number of pixels displayed on the screen.
    When it matters: When easier reading at a glance and better day-to-day screen comfort matter to you.

    Importance: MEDIUM

    MyKronoz ZeFit4 HR has a lower screen resolution than the average fitness tracker (128x80 vs 194x368). The average fitness tracker has a screen resolution of 194x368.128x80 vs 194x368
  • 33.3% lower screen brightness
    MyKronoz ZeFit4 HR has a lower screen brightness than the average fitness tracker (300 nits vs 450 nits). The average fitness tracker has screen brightness of 450 nits.
    What it is: Maximum brightness output of the screen.
    When it matters: When visibility changes often between indoor, outdoor, daytime, and low-light conditions.

    Importance: HIGH

    Good value: >=450 nits

    MyKronoz ZeFit4 HR has a lower screen brightness than the average fitness tracker (300 nits vs 450 nits). The average fitness tracker has screen brightness of 450 nits.300 nits vs 450 nits
  • No weight tracking
    MyKronoz ZeFit4 HR does not support weight tracking, while the average fitness tracker does. 81.3% of fitness trackers support weight tracking.
    What it is: Records body weight measurements.
    When it matters: When tracking daily habits and body trends beyond workouts matters to your health routine.

    Importance: LOW

    MyKronoz ZeFit4 HR does not support weight tracking, while the average fitness tracker does. 81.3% of fitness trackers support weight tracking.
  • 34% lower pixel density
    MyKronoz ZeFit4 HR has a lower pixel density than the average fitness tracker (163 ppi vs 247 ppi). The average fitness tracker has a pixel density of 247 ppi.
    What it is: Number of pixels per inch determining screen sharpness.
    When it matters: When easier reading at a glance and better day-to-day screen comfort matter to you.

    Importance: LOW

    Good value: >=280 ppi

    MyKronoz ZeFit4 HR has a lower pixel density than the average fitness tracker (163 ppi vs 247 ppi). The average fitness tracker has a pixel density of 247 ppi.163 ppi vs 247 ppi
  • Limited ip rating
    MyKronoz ZeFit4 HR has a lower IP rating than the average fitness tracker (IP67 vs IP68). The average fitness tracker has an IP rating of IP68.
    What it is: Dust and water resistance classification according to IP standards.
    When it matters: When you plan to swim, shower, dive, or use the tracker regularly around water.

    Importance: LOW

    MyKronoz ZeFit4 HR has a lower IP rating than the average fitness tracker (IP67 vs IP68). The average fitness tracker has an IP rating of IP68.IP67 vs IP68
  • 27.3% smaller battery capacity
    MyKronoz ZeFit4 HR has a lower battery capacity than the average fitness tracker (80 mAh vs 110 mAh). The average fitness tracker has 110 mAh of battery capacity.
    What it is: Energy storage capacity of the battery.
    When it matters: When you want rough battery context behind the runtime claim instead of trusting the advertised hours alone.

    Importance: MEDIUM

    Good value: >=100 mAh

    MyKronoz ZeFit4 HR has a lower battery capacity than the average fitness tracker (80 mAh vs 110 mAh). The average fitness tracker has 110 mAh of battery capacity.80 mAh vs 110 mAh
Total
Overall
Sports & Navigation
Battery
Display
Connectivity
Design & Durability
App & Wellness

Graphic comparison of MyKronoz ZeFit4 HR and

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Third-party reviews

United Kingdom
amazon
3.1
76 Reviews
amazon
2.7
16 Reviews
amazon
3.2
3 Reviews

(Reviews last updated: Jun 2026)

What customers like about MyKronoz ZeFit4 HR?

  • Comfortable to wear for long periods
  • Easy to charge using a magnetic connection or wireless charging support
  • Vibrant and readable color touchscreen with intuitive navigation
  • Comprehensive feature set including heart rate, steps, and sleep tracking
  • Useful smart features like remote camera/music control and find my phone
  • Good compatibility with Android, iOS, and even Windows platforms

What customers dislike about MyKronoz ZeFit4 HR?

  • Reports of poor build quality, with some units falling apart
  • Inconsistent battery performance; some users reported it failing shortly after charging
  • Unreliable step counting and heart rate accuracy for some users
  • The wristband can be too small for larger hands
  • Software issues including incorrect clock/date synchronization that cannot be manually fixed
  • Charging cradle can be impractical for travel

Expert reviews

A
activegearreview.com
15/01/2018
MyKronoz ZeTime Review (Includes hardware comparison to ZeFit 3/4 HR series)

The MyKronoz ZeTime is a unique hybrid smartwatch that blends traditional Swiss design with digital functionality, notably featuring physical mechanical hands positioned directly over a TFT color touchscreen. Built with a heavy, durable stainless steel case and scratch-resistant sapphire glass, it weighs 90 grams in its regular 44mm size, conveying a premium and solid feel on the...Read more

H
heise.de
04/04/2026
Top 10: The Best Fitness Trackers Tested – Great Heart Rate Monitors Under 100 Euros

The Heise Bestenlisten comprehensive evaluation of budget fitness trackers highlights the Amazfit Bip 6 as the top overall pick, providing highly accurate heart rate monitoring, an excellent AMOLED display, and reliable GPS navigation for an affordable price of roughly €69. It stands alongside the feature-rich Fitbit Charge 6, named the technology winner for its advanced health...Read more

(Translated)Show original

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