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Fitbit Flex Review | 171 Data compared

Avg. price in UK: ~£80
Avg. price in US: ~$100
Form factor: wristband
Battery life: 5 days
Screen size: ?

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

6.6

Good

6.1

Good

8.7

Excellent

4.9
Swimming
Score components:
28.0%
9.0
ATM rating
24.0%
4.0
Open-water swim mode
18.0%
2.8
Waterproof depth rating
15.0%
4.0
GPS
15.0%
2.0
Battery life
7.3
Kids
Score components:
30.0%
2.0
Battery life
25.0%
10
Weight
20.0%
9.0
ATM rating
15.0%
9.0
Screen size
10.0%
10
Price

Best prices in UK

£?

Best rankings

Verdict

The Fitbit Flex is a minimalist, screenless activity and sleep tracker featuring a 3-axis accelerometer, five-LED indicator lights for goal tracking, and Bluetooth 4.0 for wireless syncing with mobile devices. Its primary characteristics include tracking daily steps, distance, calories burned, and active minutes, alongside a silent vibrating alarm and automatic sleep monitoring. Major pros include a lightweight, comfortable design with interchangeable bands, a solid 5-day battery life, and a robust supporting app ecosystem for data analysis and food logging. However, common cons include the lack of a proper digital display or altimeter for tracking stairs, a proprietary charging cable, and a strap clasp that many users find difficult to secure.

Technical Specifications of Fitbit Flex

Overall score

6.6

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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.

Health

5.3

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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

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

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

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

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

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Sports & Navigation

7.5

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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

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

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

?

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

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

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Smart Features

5.2

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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

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

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

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

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App & Wellness

8.2

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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

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

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

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

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

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Connectivity

9.0

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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

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

?

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

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

?

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Battery

4.3

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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

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

N/A

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

?

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Display

5.4

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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

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

?

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

N/A

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

N/A

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

N/A

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Design & Durability

8.3

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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

wristband

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

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

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

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

11 mm

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Fitbit Flex vs the average fitness tracker

Why is Fitbit Flex better than the average fitness tracker?

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44% lighter
Fitbit Flex is lighter than the average fitness tracker (14 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
Fitbit Flex is lighter than the average fitness tracker (14 g vs 25 g). The average fitness tracker weighs 25 g.14 g vs 25 g
Tracks menstrual cycle
Fitbit Flex supports menstrual cycle tracking, while the average fitness tracker does not. 41.7% of fitness trackers support menstrual cycle tracking.
Includes menstrual-cycle tracking.
What it is: Tracks menstrual cycle and related data.
When it matters: When cycle tracking is part of your health routine and you want those records kept alongside the rest of your wearable data.
Importance: LOW
Fitbit Flex supports menstrual cycle tracking, while the average fitness tracker does not. 41.7% of fitness trackers support menstrual cycle tracking.
Windows compatible
Fitbit Flex is compatible with Windows, while the average fitness tracker is not. 22.3% of fitness trackers are compatible with Windows.
Via Fitbit Connect.
What it is: Compatible with Windows computers.
When it matters: When compatibility with your phone, computer, accessories, or wireless setup affects how well the tracker fits into your ecosystem.
Importance: LOW
Fitbit Flex is compatible with Windows, while the average fitness tracker is not. 22.3% of fitness trackers are compatible with Windows.
Mac OS X compatible
Fitbit Flex is compatible with Mac OS X, while the average fitness tracker is not. 27.5% of fitness trackers are compatible with Mac OS X.
Via Fitbit Connect.
What it is: Compatible with macOS devices.
When it matters: When compatibility with your phone, computer, accessories, or wireless setup affects how well the tracker fits into your ecosystem.
Importance: LOW
Fitbit Flex is compatible with Mac OS X, while the average fitness tracker is not. 27.5% of fitness trackers are compatible with Mac OS X.
NFC
Fitbit Flex has NFC, while the average fitness tracker does not. 10.1% of fitness trackers have NFC.
NFC is for pairing only.
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
Fitbit Flex has NFC, while the average fitness tracker does not. 10.1% of fitness trackers have NFC.
Cycle start prediction
Fitbit Flex predicts the start date, while the average fitness tracker does not. 42.2% of fitness trackers predict the start date.
Predicts the next period start date.
What it is: Shows whether the platform can estimate when the next menstrual cycle is likely to begin.
When it matters: When cycle tracking, fertility insight, or related reminders are part of your health routine.
Importance: LOW
Fitbit Flex predicts the start date, while the average fitness tracker does not. 42.2% of fitness trackers predict the start date.
Ovulation prediction
Fitbit Flex predicts ovulation, while the average fitness tracker does not. 41.4% of fitness trackers predict ovulation.
Predicts ovulation.
What it is: Shows whether the health platform can estimate the ovulation window from tracked cycle data.
When it matters: When cycle tracking, fertility insight, or related reminders are part of your health routine.
Importance: LOW
Fitbit Flex predicts ovulation, while the average fitness tracker does not. 41.4% of fitness trackers predict ovulation.
Built-in route tracker
Fitbit Flex supports route tracking, while the average fitness tracker does not. 49.8% of fitness trackers support route tracking.
Uses connected phone GPS for route maps.
What it is: Shows whether the platform can record and save route history for outdoor activities such as running, hiking, or cycling.
When it matters: When you want to review where you went after a workout instead of seeing only distance and time totals.
Importance: LOW
Fitbit Flex supports route tracking, while the average fitness tracker does not. 49.8% of fitness trackers support route tracking.
Tracks menstrual cycle
Fitbit Flex supports menstrual cycle tracking, while the average fitness tracker does not. 41.7% of fitness trackers support menstrual cycle tracking.
Ovulation prediction
Fitbit Flex predicts ovulation, while the average fitness tracker does not. 41.4% of fitness trackers predict ovulation.
Cycle start prediction
Fitbit Flex predicts the start date, while the average fitness tracker does not. 42.2% of fitness trackers predict the start date.
Built-in route tracker
Fitbit Flex supports route tracking, while the average fitness tracker does not. 49.8% of fitness trackers support route tracking.
7.1% higher maximum altitude
Fitbit Flex has a higher maximum altitude than the average fitness tracker (9,144 m vs 8,534 m). The average fitness tracker supports a maximum altitude of 8,534 m.
Windows compatible
Fitbit Flex is compatible with Windows, while the average fitness tracker is not. 22.3% of fitness trackers are compatible with Windows.
Mac OS X compatible
Fitbit Flex is compatible with Mac OS X, while the average fitness tracker is not. 27.5% of fitness trackers are compatible with Mac OS X.
NFC
Fitbit Flex has NFC, while the average fitness tracker does not. 10.1% of fitness trackers have NFC.
44% lighter
Fitbit Flex is lighter than the average fitness tracker (14 g vs 25 g). The average fitness tracker weighs 25 g.
29.8 mm lower height
Fitbit Flex is shorter than the average fitness tracker (11 mm vs 40.8 mm). The average fitness tracker has a height of 40.8 mm.
Tracks calorie intake
Fitbit Flex supports calorie intake tracking, while the average fitness tracker does not. 39.3% of fitness trackers support calorie intake tracking.

Design & Durability

Why is Fitbit Flex worse than the average fitness tracker?

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No heart rate monitoring
Fitbit Flex does not support heart rate monitoring, while the average fitness tracker does. 60% of fitness trackers support heart rate monitoring.
No sleep reports
Fitbit Flex does not support sleep reports, while the average fitness tracker does. 84.8% of fitness trackers support sleep reports.
No automatic activity detection
Fitbit Flex does not support automatic activity detection, while the average fitness tracker does. 50.3% of fitness trackers support automatic activity detection.
10 fewer stored activities
Fitbit Flex has fewer stored activities than the average fitness tracker (0 vs 10). The average fitness tracker stores 10 activities.
5 days shorter battery life
Fitbit Flex 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.
No battery level indicator
Fitbit Flex does not have a battery level indicator, while the average fitness tracker does. 88.8% of fitness trackers have a battery level indicator.
No display
Fitbit Flex does not have a display, while the average fitness tracker does. 76.1% of fitness trackers have a display.
Uses indicator lights instead of a full display.
No notifications
Fitbit Flex does not support notifications, while the average fitness tracker does. 72.6% of fitness trackers support notifications.
No stopwatch
Fitbit Flex does not have a stopwatch, while the average fitness tracker does. 58.4% of fitness trackers have a stopwatch.
40 m lower waterproof depth rating
Fitbit Flex has a lower waterproof depth rating than the average fitness tracker (10 m vs 50 m). The average fitness tracker has a waterproof depth rating of 50 m.
20 °C higher minimum operating temperature
Fitbit Flex 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.
3 older release date
Fitbit Flex was released earlier than the average fitness tracker (2,013 vs 2,016). The average fitness tracker was released in 2,016.
May 2013
No personalization options
Fitbit Flex cannot be personalized, while the average fitness tracker can. 80% of fitness trackers can be personalized.
No inactivity alerts
Fitbit Flex does not support inactivity alerts, while the average fitness tracker does. 76.5% of fitness trackers support inactivity alerts.
No heart rate monitoring
Fitbit Flex does not support heart rate monitoring, while the average fitness tracker does. 60% of fitness trackers support heart rate monitoring.
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
Fitbit Flex does not support heart rate monitoring, while the average fitness tracker does. 60% of fitness trackers support heart rate monitoring.
No automatic activity detection
Fitbit Flex does not support automatic activity detection, while the average fitness tracker does. 50.3% of fitness trackers support automatic activity detection.
What it is: Automatically recognizes and records physical activities.
When it matters: When you want common workouts captured even on days when you forget to start tracking manually.
Importance: MEDIUM
Fitbit Flex does not support automatic activity detection, while the average fitness tracker does. 50.3% of fitness trackers support automatic activity detection.
5 days shorter battery life
Fitbit Flex 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
Fitbit Flex 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 notifications
Fitbit Flex does not support notifications, while the average fitness tracker does. 72.6% of fitness trackers support 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
Fitbit Flex does not support notifications, while the average fitness tracker does. 72.6% of fitness trackers support notifications.
No sleep reports
Fitbit Flex does not support sleep reports, while the average fitness tracker does. 84.8% of fitness trackers support sleep reports.
What it is: Shows whether the companion platform turns sleep data into reports or summaries instead of only raw nightly logs.
When it matters: When you want sleep data turned into clearer nightly summaries instead of digging through raw charts on your own.
Importance: LOW
Fitbit Flex does not support sleep reports, while the average fitness tracker does. 84.8% of fitness trackers support sleep reports.
No battery level indicator
Fitbit Flex does not have a battery level indicator, while the average fitness tracker does. 88.8% of fitness trackers have a battery level indicator.
What it is: Shows remaining battery percentage.
When it matters: When charging speed, charging method, or battery upkeep convenience matters to your routine.
Importance: LOW
Fitbit Flex does not have a battery level indicator, while the average fitness tracker does. 88.8% of fitness trackers have a battery level indicator.
No personalization options
Fitbit Flex cannot be personalized, while the average fitness tracker can. 80% of fitness trackers can be personalized.
What it is: Shows whether the device or companion platform allows meaningful personalization such as layouts, watch faces, recommendations, or settings.
When it matters: When watch faces, app layout, recommendations, or personalized metrics affect whether the ecosystem feels useful long term.
Importance: LOW
Fitbit Flex cannot be personalized, while the average fitness tracker can. 80% of fitness trackers can be personalized.
40 m lower waterproof depth rating
Fitbit Flex has a lower waterproof depth rating than the average fitness tracker (10 m vs 50 m). The average fitness tracker has a waterproof depth rating of 50 m.
What it is: Maximum depth the device can withstand underwater.
When it matters: When you plan to swim, shower, dive, or use the tracker regularly around water.
Importance: LOW
Good value: >=50 m
Fitbit Flex has a lower waterproof depth rating than the average fitness tracker (10 m vs 50 m). The average fitness tracker has a waterproof depth rating of 50 m.10 m vs 50 m

Design & Durability

Graphic comparison of Fitbit Flex and

Attribute category

Attribute

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Third-party reviews

United Kingdom

(Reviews last updated: Jun 2026)

What customers like about Fitbit Flex?

Lightweight and comfortable for 24/7 wear
Water-resistant design allows for use in the shower or rain
Intuitive and comprehensive mobile app and web dashboard
Effective 'Silent Alarm' feature that wakes users with vibrations
Motivational goal-tracking via five LED progress indicator dots
Customisable look with a variety of interchangeable coloured bands
Good battery life, typically lasting between 5 to 7 days

What customers dislike about Fitbit Flex?

No built-in display to see real-time stats or time of day
Lacks an altimeter, meaning it cannot track floors or stairs climbed
Uses a proprietary charging cradle that is easy to lose and hard to replace
Sleep tracking often requires manual activation through the app or device tapping
Step accuracy can be affected by non-walking movements like typing or arm gestures
The wristband clasp can be difficult and awkward to fasten securely
No integrated heart rate monitor

Expert reviews

breakingeighty.com

04/05/2021

Fitbit Flex Review

In this review, Sean Ogle shares his first-hand experience testing the budget-friendly Fitbit Flex fitness tracker, evaluating how well it serves active individuals and golfers looking to monitor their health habits. A major highlight of the device is its entry-level affordability under $100 and its seamless integration with a highly functional, well-designed companion mobile app....Read more

itstactical.com

07/08/2014

Fitbit Flex Review: Tracking Your Activity for a Comprehensive Fitness Picture

Fitbit Flex Review Summary The Fitbit Flex is a highly motivating, rubberized wristband activity tracker that acts like a silent coach by providing real-time visual feedback. It features a sleek, low-profile design and a unique display composed of five LED lights that illuminate in 20% increments toward a user’s daily step, calorie, or distance goal. Users benefit from a versatile...Read more

expertreviews.co.uk

18/06/2019

Fitbit Flex review: Gone but not forgotten

The Expert Reviews Fitbit Flex review highlights the legacy of this discontinued entry-level fitness tracker, noting that it still serves as a functional, budget-friendly option when purchased second-hand for around £20. A major standout pro is its comfortable, modular design, which features a removable core tracking module that allows users to swap out and color-coordinate a...Read more

techradar.com

17/11/2017

Fitbit Flex review - TechRadar

The Fitbit Flex is a lightweight and comfortable, wrist-mounted fitness tracker that automatically monitors both your daily activity and sleep patterns. Originally released in 2013 for $99.95, it introduced a significant design upgrade over its pocket-clipped predecessors by housing its compact, removable sensor into a secure rubber wristband. The tracker excels in its daily...Read more

t3.com

16/10/2015

Fitbit Flex review: step counting takes a step up

The Fitbit Flex is a highly compact, minimalist, and affordable activity tracker that focuses on general health monitoring rather than advanced athletic training. It tracks daily steps, calories burned, distance, and active minutes using an internal accelerometer, providing an easy glance at progress through five simple LED display dots. Its lightweight, rubberized band design...Read more

theguardian.com

14/07/2014

Fitbit flex wristband review: a weight loss tracker that makes fitness a habit - The Guardian

In this review from The Guardian, author Emma John evaluates the Fitbit Flex wristband alongside the Aria smart scales to achieve a personal goal of losing 5lbs. The review highlights several notable benefits, particularly the nicely presented and user-friendly mobile app and online dashboard, which sync data seamlessly in real time. A major advantage is the device's compatibility...Read more

pcmag.com

06/05/2013

Fitbit Flex Review - PCMag

The Fitbit Flex is a comfortable, stylish, and lightweight wristband tracker offering excellent battery life, high accuracy, and seamless wireless syncing with a great web experience. Its pros include useful sleep tracking and a silent alarm, making it a highly convenient, competitively priced option. PCMag Cons include limited, LED-only display information that necessitates using...Read more

cnet.com

06/05/2013

Fitbit Flex review: A most versatile, feature-packed tracker - CNET

The Fitbit Flex is a $99.95 wristband-style personal fitness tracker that effectively monitors your daily steps, sleep quality, and calories burned. Designed with a light, comfortable, and water-resistant rubbery strap, the device houses a small, removable electronic "pebble" that tracks your metrics and displays progress using five built-in LED indicator lights. A major benefit...Read more

cnet.com

12/05/2013

My life with the Fitbit Flex activity tracker

Fitbit Flex Review Summary The Fitbit Flex is a water-resistant wristband activity tracker that offers a highly motivating, lightweight design for $100. A major strength of the device is its progress indicator, which uses five small LED lights and physical vibrations to directly alert users when they achieve milestone percentages of their daily step goals. Unlike its clip-on...Read more

wired.com

06/05/2013

Review: Fitbit Flex - WIRED

In his 2013 WIRED review, Mat Honan highly praises the Fitbit Flex, awarding it a 9/10 rating and declaring it the best sleep and activity tracker available at the time. Priced at $100, the device is lauded for its "always-on wearability," featuring a lightweight, slim, rubberized wristband design that lacks an obvious sensor look, making it suitable for both casual wear and...Read more

linustechtips.com

04/10/2013

Fitbit Flex review! - Linus Tech Tips

The Fitbit Flex is lauded for its comfortable, lightweight rubberized wristband and its water-resistant, GoPro-style, modular design, which features a small,, easily removable tracking component. It boasts reliable daily metrics tracking, impressive five-plus-day battery life, and a quick, 45-minute recharge time for an 80% charge. Forums - However, the reviewer notes that the...Read more

irishtimes.com

17/10/2013

Review: The Fitbit Flex - The Irish Times

The Irish Times review characterizes the Fitbit Flex as a user-friendly tracker featuring automatic wireless syncing to PCs and integration with third-party apps like RunKeeper. It offers solid data storage, keeping seven days of detailed, or 30 days of general, activity data. The Irish Times However, the review cites drawbacks, including a proprietary charging cable and a five-day...Read more

livescience.com

02/10/2013

Fitbit Flex: Fitness Tracker Review - Live Science

The Live Science review identifies the Fitbit Flex as a comfortable, lightweight, and motivating activity tracker that effectively monitors steps, sleep, and diet with a 6.3/10 rating. Key pros include its slim design, wireless Bluetooth synchronization, and LED indicators for tracking daily goals on the wristband. Conversely, the device suffers from a heavy dependence on its...Read more

laptopmag.com

05/05/2013

Fitbit Flex Review - LAPTOP Magazine

The Laptop Mag review highlights the Fitbit Flex as a top-tier, minimalist fitness and sleep tracker that stands out for its all-around value and robust application ecosystem. Priced competitively at $99, the device features a small, pill-like tracker housed inside a highly comfortable, water-resistant rubberized band that can be worn in the shower or during light swimming up to 10...Read more

theverge.com

06/05/2013

Fitbit Flex review - The Verge

The 2013 Verge review highlights the $99 Fitbit Flex as a comfortable, unobtrusive wristband tracker with a removable, waterproof module and five LED lights tracking progress toward daily goals. Pros include its accurate step counting, strong app ecosystem for food/water tracking, and a built-in silent alarm, making it a reliable, convenient option over clip-on trackers. However,...Read more

medium.com

19/12/2014

Fitbit Flex — A Self-Experiment

In a one-month self-experiment, Thomas Peham highlights the Fitbit Flex's seamless wireless synchronization with devices and its effectiveness as a motivational tool through LED progress updates. A significant positive mentioned is the company's excellent customer service, which provided a fast, complimentary replacement for a damaged wristband. Medium · Conversely, the review notes...Read more

connect.de

19/05/2014

Fitbit Flex Review - Connect

The connect.de product review concludes that the Fitbit Flex is a highly mature fitness tracker that remains competitive primarily due to its sophisticated supporting application. The reviewer praises the device's exceptional 96% accuracy in distance calculations, noting that its underlying sensors and algorithms perform far better than expected. Additional core strengths include...Read more

heise.de

24/10/2013

Fitbit Flex Review", "Fitbit Flex Test

Fitbit Flex The Fitbit Flex is a compact, capsule-shaped fitness tracker designed to sit comfortably inside a rubberized, water-resistant plastic wristband that can be submerged up to ten meters. In terms of positives, the device features a comfortable, unobtrusive design that is easy to wear even while sleeping. It provides strong battery life lasting between 4 to 6 days depending...Read more

diegesundheitsexperten.com

18/10/2013

Review: Fitbit Flex - The Health Experts

The German health blog diegesundheitsexperten published a critical review of the Fitbit Flex written by reviewer "Doc Tom," who tested a complimentary review unit. Priced at approximately 99 Euros, the wristband is designed to calculate daily steps, distance, and calories burned using arm movements, while also providing automatic sleep tracking and a silent vibrating alarm. The...Read more

chip.de

20/07/2013

Fitbit Flex - CHIP Review

The CHIP review of the €100 Fitbit Flex identifies it as a solid, motivational activity tracker designed for general consumers wanting to move more, though it falls short for serious athletes. The device tracks steps, distance, active minutes, and calories burned by calculating user metrics such as age, height, gender, and weight. It also monitors sleep patterns and features a...Read more

chip.de

22/08/2014

Fitbit Flex (Fitness Tracker) Review - CHIP", "Fitbit Flex (Fitness Tracker) Test - CHIP

The Fitbit Flex is a pioneering fitness tracker that focuses on core activity metrics but shows its age due to lacking modern features. It tracks daily steps, calculates distance, estimates calorie burn, and monitors sleep cycles through manual activation. Rather than featuring a traditional display, the device uses five LED progress lights to show goal completion and relies on a...Read more

lesnumeriques.com

07/12/2013

Fitbit Flex Review: Small Band, Giant Leap

Fitbit Flex Review Summary The Fitbit Flex is a lightweight, water-resistant activity tracker designed to monitor daily fitness goals like step count, distance covered, calories burned, and active minutes. Launched at a price of 99 euros, the device tracks real-time progress using an elegant series of LED visual indicators. The tracker automatically vibrates to celebrate when...Read more

journaldugeek.com

03/06/2013

Fitbit Flex Review

The Fitbit Flex is a minimalist, screenless activity tracker designed as a small removable sensor embedded within a customizable matte rubber wristband, catering to a general audience looking to improve daily mobility. Standout advantages include its water-resistant design, an extensive 5 to 7-day battery life, and seamless automatic wireless synchronization via Bluetooth to...Read more

trentejours.com

30/07/2014

Fitbit Flex: full review of the connected pedometer

This review evaluates the Fitbit Flex as a discrete, wrist-worn pedometer tailored for monitoring daily steps and movement goals. The reviewer notes several prominent pros, highlighted by its lightweight and secure rubberized wristband design that makes it nearly impossible to lose compared to pocket-clipped trackers. It delivers reliable step-counting functionality that effectively...Read more

trailandrunning.com

10/12/2021

FITBIT FLEX: Activity tracker review

The Fitbit Flex review from Trail & Running highlights the device as a complete and highly functional activity tracker priced at €99.95, designed to closely monitor daily physical activity and energetic balance. The author, Grégory, notes that the tracker syncs data to a computer via a supplied USB cable or to a smartphone via Bluetooth, providing easy access to the dedicated...Read more

01net.com

29/07/2014

Fitbit Flex Review: This good fitness tracker is now compatible with Windows Phone

The Fitbit Flex is a screenless activity tracker designed to monitor daily physical movements, such as counting steps, estimating distances, and tracking burned calories. Activity data synchronizes via Bluetooth to Android, iOS, and newly supported Windows Phone 8.1 smartphones, or to a computer using a bundled USB dongle. Instead of a digital display, the device features a...Read more

pixel-geek.fr

30/08/2015

Fitbit Flex Fitness Tracker: Our Review

The review from Pixel Geek highlights the Fitbit Flex as an electronic coach designed to track daily steps, distance covered, and sleep quality while integrating seamlessly with third-party fitness apps like RunKeeper and MyFitnessPal. The reviewer praises the device for its long battery life and waterproof build, allowing users to wear it in the shower without removing the strap....Read more

colineetsondino.wordpress.com

14/05/2014

Two Months Later: My Fitbit Flex Review", "Two Months In: My Thoughts on the Fitbit Flex

The Coline et son Dino Review offers an enthusiastic, highly positive two-month evaluation of the Fitbit Flex fitness tracker. The author wears the tracker continuously, replacing her regular watch with its lightweight and non-intrusive design. She primarily relies on the clear mobile application layout to track daily goals such as metrics like steps, distance, active minutes, and...Read more

treki23.com

20/03/2014

Testing the Fitbit Flex: Two weeks later - Treki23

summary of the Fitbit Flex review: The reviewer transitions from the Fitbit Zip to the Fitbit Flex and finds it surprisingly comfortable, lightweight, and secure on the wrist despite initial skepticism. Key advantages include its water resistance, which prevents the user from accidentally leaving it at home, and a highly impressive battery life that lasted eight days on a single...Read more

xataka.com.mx

09/05/2014

Fitbit Flex Review - Xataka Mexico

Fitbit Flex Review Summary The Fitbit Flex is a simple, screenless fitness tracker designed for basic, reliable activity tracking. Instead of a touch display, the device uses a minimal visual layout featuring small LED lights that illuminate with two taps to show progress toward daily goals. It communicates wirelessly to sync data with smartphones via iOS, Android, and Windows...Read more

forbes.com.mx

20/09/2014

Fitbit Flex: The Wearable for (Almost) Everyone

This review of the Fitbit Flex by Forbes México frames the device as a lightweight, practical, and discrete fitness tracker that successfully blends precise physical tracking with good energy efficiency. On the positive side (pros), the reviewer praises its structural durability and waterproof design, noting that the sensor pill is safely shielded inside a buttonless plastic band....Read more

es.gizmodo.com

10/05/2013

Fitbit Flex review: A great tracker that needs improvement

However, the review details significant drawbacks regarding design, accuracy, and overall device utility. Structurally, the minimalist wristband completely lacks a display screen to show the time or comprehensive data, and its physical clasp mechanism is highly frustrating and uncomfortable to fasten. Functionally, the device is missing an altimeter, meaning it entirely fails to...Read more

xataka.com

07/06/2013

Fitbit Flex review

Fitbit Flex Review Summary The Fitbit Flex is a lightweight and highly comfortable water-resistant activity tracker designed as a silicone wristband containing a small, removable sensor. Its design allows for continuous wear, even during showers or swimming, and its discrete, low-profile form factor prevents it from interfering with everyday activities like typing. Operating with...Read more

nextgentech.it

05/09/2016

Fitbit Flex Review: Always on the Move

The Fitbit Flex is a minimalist fitness tracker designed for users who want to monitor their daily physical activity without the distraction of smartphone notifications. Equipped with a three-axis accelerometer, it tracks steps, calories burned, distance traveled, and sleep patterns, though its accuracy is slightly limited due to the absence of a built-in GPS sensor. Instead of a...Read more

dday.it

04/08/2014

Prova Fitbit Flex: serve davvero a qualcosa?

The DDay.it review praises the Fitbit Flex as a highly comfortable, well-designed, and lightweight smartband that serves as an excellent basic motivational tool to encourage daily physical activity. Its core strengths lie in its excellent ecosystem and well-crafted mobile app, which syncs seamlessly in real time via Bluetooth 4.0 LE,. Key functional pros highlighted include a...Read more

macitynet.it

18 March 2026*

Fitbit Flex Review: The Wrist-Worn Tracker to Motivate Your Physical Activity

The Macitynet review characterises the Fitbit Flex (€99.99) as a sleek, lightweight, and highly non-intrusive wristband tracker aimed at sedentary individuals looking to improve their lifestyle. Stripped of a traditional screen, it uses a minimal five-LED progress system activated via a double-tap, where each light represents 20% of a pre-selected daily target like steps or...Read more

tweakers.net

30/06/2026

Fitbit Flex Black (Black) - Removed - Product reviews

The Fitbit Flex (Black edition) reviewed on the Dutch tech platform Tweakers is rated as an excellent, budget-friendly option for beginner athletes looking to transition into a healthier lifestyle. The reviewer awards the device an overall score of 4 out of 5 stars ("Good"). A major highlight of the device is its comprehensive companion dashboard, which provides a wealth of...Read more

portablegear.nl

Unknown

Fitbit Flex review - Portablegear

The Fitbit Flex is a sleek, lightweight, and comfortable activity tracker designed for daily movement and sleep tracking, featuring Bluetooth syncing with a companion app for monitoring steps, distance, and calories. Key benefits include automatic sleep tracking, a silent vibration alarm, and an unobtrusive design, although it lacks a dedicated display, relying only on LED...Read more

natuurlijklinda.nl

23/10/2016

Fitbit Flex Review

summary of the Fitbit Flex review: The major disadvantages highlighted are the lack of built-in GPS and a heart rate monitor, meaning users must always carry a smartphone to track routes, speed, or intensive effort. Another major drawback is durability; the reviewer’s rubber wristband cracked near the display after just four months, a known issue she notes amongst other Fitbit...Read more

coolesuggesties.nl

06/09/2014

Review: Fitbit Flex pedometer

The Fitbit Flex is a silicone wristband activity tracker designed primarily to help users maintain a healthy lifestyle and monitor daily movement, particularly for individuals with sedentary office jobs. Priced at 99 euros, it features a removable tracking module with a built-in rechargeable battery lasting between 5 and 9 days. The device relies on a row of LED indicator lights on...Read more

androidworld.nl

02/07/2013

Fitbit Flex Review: Comprehensive, Stylish Pedometer

The major advantage of the tracker is its unobtrusive, comfortable form factor and its water resistance, making it perfectly safe to wear in the shower. Additionally, the battery performance is strong, lasting five to seven days depending on sleep tracking usage, and it recharges quickly in about two hours via a computer. However, the device has significant limitations, most notably...Read more

tweakers.net

01/01/2018

Thorough and independent Fitbit reviews

In his May 2026 product review on Tweakers, user petrusvR shared a highly critical 1 out of 5 stars rating for the Fitbit Charge 6 (Black) after using the fitness tracker for nearly a year. The user noted that while they were completely satisfied and happy with the product’s performance up until early May 2026, their positive sentiment completely vanished due to a sudden and severe...Read more

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