• Fitbit Flex
  • Fitbit Flex
  • Fitbit Flex
  • Fitbit Flex
  • Fitbit Flex
  • Fitbit Flex

This fitness tracking device is a powerful companion that accurately tracks your movements, health and long-term goals.

- Bethany Gordon , Top Ten Reviews 

The Flex is sleek, simple, and fun to use, but shouldn't be mistaken for serious fitness technology.

- Lee Crane , Digital Trends 

Specs / Features


Tracks steps, distance, calories burned and active minutes | Monitor how long and well you sleep | Wakes you (and not your partner) with a silent wake alarm | LED lights show how your day is stacking up against your goal | Slim, comfortable and easy to wear (sold with both large and small wristbands included with an interchangeable clasp) | Sync stats wirelessly and automatically to your computer and over 150 leading smartphones

Tracks steps, distance, calories burned and active minutes | Monitor how long and well you sleep | Wakes you (and not your partner) with a silent wake alarm | LED lights show how your day is stacking up against your goal | Slim, comfortable and easy to wear (sold with both large and small wristbands included with an interchangeable clasp) | Sync stats wirelessly and automatically to your computer and over 150 leading smartphones

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Specification

Specification
Brand Fitbit
Model FB401BK
Warranty 12 months
Size 1 cm (0.4 in)

Reviews (7.3/10 Avg. rating)


Expert Reviews

The best simple fitness tracker

from Expert Reviews

The Fitbit Flex is still a great entry-level fitness tracker, with a strong supporting app and first-rate web portal. The bundled wireless dongle also makes syncing your data a breeze via your computer as well as your phone.

The Flex is comfortable to wear, has a decent (five day) battery life, can be colour coordinated, and tracks all your daily activity and nightly sleep. While there are far better featured devices available now, at only £45 the Flex makes a strong case for itself for first time buyers.

Read full review

The Fitbit Flex is still a great entry-level fitness tracker, with a strong supporting app and first-rate web portal. The bundled wireless dongle also makes syncing your data a breeze via your computer as well as your phone.

The Flex is comfortable to wear, has a decent (five day) battery life, can be colour coordinated, and tracks all your daily activity and nightly sleep. While there are far better featured devices available now, at only £45 the Flex makes a strong case for itself for first time buyers.

Read full review

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T3

Step counting takes a step up

from T3

The Fitbit Flex offers everything a person could want from a basic activity and sleep tracker. It’s fairly accurate, and prices have come down considerably to make it one of the cheapest ways to check out activity tracking.

Competition from the likes of the Jawbone Up range of activity trackers may be tempting but that means a more expensive band that's less versatile.

Clearly the little Fitbit has limitations, and it you’re looking for a device to get deep into training then this isn’t one for you, but if you’re considering dipping a toe into fitness tech, or keen on tracking general activity for broader health reasons then this is well worth a look. The food tracking and competition via the app should help keep people hooked long enough to see genuine benefits.

Read full review

The Fitbit Flex offers everything a person could want from a basic activity and sleep tracker. It’s fairly accurate, and prices have come down considerably to make it one of the cheapest ways to check out activity tracking.

Competition from the likes of the Jawbone Up range of activity trackers may be tempting but that means a more expensive band that's less versatile.

Clearly the little Fitbit has limitations, and it you’re looking for a device to get deep into training then this isn’t one for you, but if you’re considering dipping a toe into fitness tech, or keen on tracking general activity for broader health reasons then this is well worth a look. The food tracking and competition via the app should help keep people hooked long enough to see genuine benefits.

Read full review

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Tech Void

Clean, intuitive, and interesting

from Tech Void

The Fitbit Flex is the most popular fitness tracker around. If you don’t believe me, look at the wrists of participants in your next meeting. It’s an attractive, understated device, and it’s one that’s comfortable to wear. Tracking 10,000 steps a day may have been proven irrelevant as a rational fitness litmus test, but it’s still a fun way to compete with friends and family while improving upon your laziness. Nevertheless, I don’t recommend this device for tracking runs unless you stick it in your pocket. Accuracy will always be suspect because of arm swing tallies, so in many ways the Fitbit Flex is a bit of a data failure. Newer models like the Charge and Surge may have more advanced technology that account for such problems, but you’re going to pay $30-$150 more.

Read full review

The Fitbit Flex is the most popular fitness tracker around. If you don’t believe me, look at the wrists of participants in your next meeting. It’s an attractive, understated device, and it’s one that’s comfortable to wear. Tracking 10,000 steps a day may have been proven irrelevant as a rational fitness litmus test, but it’s still a fun way to compete with friends and family while improving upon your laziness. Nevertheless, I don’t recommend this device for tracking runs unless you stick it in your pocket. Accuracy will always be suspect because of arm swing tallies, so in many ways the Fitbit Flex is a bit of a data failure. Newer models like the Charge and Surge may have more advanced technology that account for such problems, but you’re going to pay $30-$150 more.

Read full review

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LaptopMedia

Your new personal fitness instructor

from LaptopMedia

The Flex wristband is practical and convenient but the question is – Is it comfortable while sleeping? We are concerned with its width of 11.1mm. To be precise, the discomfort comes from the slightly thicker end near the transparent window. If you are used to sleeping with a watch or a bracelet you won’t be disturbed by the 13 grams of the Flex.

About calculation accuracy we’d say that it’s relatively good. Not necessarily a 100% correct, but considering that it doesn’t use GPS the results are pretty good.

Unfortunately, Fitbit Flex doesn’t monitor your heart rate or climbed stairs but for its price it offers a beautiful and simple design with practical functionality. If you are looking for a fitness tracker to review your progress and stimulate you further on a budget, you can count on Fitbit Flex.

In conclusion we could say that Fitbit Flex is a smart, functional and useful gadget we could all use to improve our eating habits and physical condition.

Read full review

The Flex wristband is practical and convenient but the question is – Is it comfortable while sleeping? We are concerned with its width of 11.1mm. To be precise, the discomfort comes from the slightly thicker end near the transparent window. If you are used to sleeping with a watch or a bracelet you won’t be disturbed by the 13 grams of the Flex.

About calculation accuracy we’d say that it’s relatively good. Not necessarily a 100% correct, but considering that it doesn’t use GPS the results are pretty good.

Unfortunately, Fitbit Flex doesn’t monitor your heart rate or climbed stairs but for its price it offers a beautiful and simple design with practical functionality. If you are looking for a fitness tracker to review your progress and stimulate you further on a budget, you can count on Fitbit Flex.

In conclusion we could say that Fitbit Flex is a smart, functional and useful gadget we could all use to improve our eating habits and physical condition.

Read full review

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TechRadar

Lightweight wristband is comfortable but display isn't informative

from TechRadar

The Fitbit ecosystem is a great way to start using technology to keep on top of your personal health.

While the Flex is starting to show its age a bit, like a fine wine it has actually improved with time. The fact it's now more affordable is also a welcome one.

There is still the question of accuracy, with high step counts seemingly too-easy to obtain thanks to inaccurate algorithms.

The wristband itself could also use a little more work. It's lightweight and comfortable, but looks more like the watchband on a kid's watch than a truly stylish piece of tech. Fitbit has addressed this with third party bands, but for most people they are a little too highly priced and opulent.

All that said though, Fitbit has shown the strengths of its platform. Wireless syncing is essential in this product lineup, and having a strong app ecosystem is a huge benefit to fitness trackers out there.

Read full review

The Fitbit ecosystem is a great way to start using technology to keep on top of your personal health.

While the Flex is starting to show its age a bit, like a fine wine it has actually improved with time. The fact it's now more affordable is also a welcome one.

There is still the question of accuracy, with high step counts seemingly too-easy to obtain thanks to inaccurate algorithms.

The wristband itself could also use a little more work. It's lightweight and comfortable, but looks more like the watchband on a kid's watch than a truly stylish piece of tech. Fitbit has addressed this with third party bands, but for most people they are a little too highly priced and opulent.

All that said though, Fitbit has shown the strengths of its platform. Wireless syncing is essential in this product lineup, and having a strong app ecosystem is a huge benefit to fitness trackers out there.

Read full review

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Pocket-lint

Smart but not sexy

from Pocket-lint

The Fitbit Flex is a great little activity tracker that runs on a fantastic platform. We weren't totally sold on its design, but as a colourful, comfortable and clever fitness tracker it's hard to complain. Especially with an app platform as good as this.

Read full review

The Fitbit Flex is a great little activity tracker that runs on a fantastic platform. We weren't totally sold on its design, but as a colourful, comfortable and clever fitness tracker it's hard to complain. Especially with an app platform as good as this.

Read full review

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Digital Spy

A convenient and affordable tracker

from Digital Spy

The Fitbit Flex strikes a good balance between affordability, convenience and user-friendliness, but the old you-get-what-you-pay-for adage applies here.

Read full review

The Fitbit Flex strikes a good balance between affordability, convenience and user-friendliness, but the old you-get-what-you-pay-for adage applies here.

Read full review

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Tech Advisor

Fitness monitor wristband that's cool and fun

from Tech Advisor

The Fitbit Flex is a cool-looking, lightweight wristband that tracks and monitors your daily activity and sleep patterns. It syncs with a desktop dashboard and mobile app to give you up-to-date activity data in gorgeous graphs. You can compete with Fitbit-using friends and even upgrade to a premium Daily Trainer service. I found the Fitbit Flex gave me added motivation to walk or run that bit further, and keep an eye on my weight and fitness activities. It’s addictive and fun, and if that gets you moving more and generally fitter and leaner it’s better for you than most other computing or mobile devices. Also consider the next step up: the Fitbit Charge also counts floors climed, and shows you your stats right there on your wrist.

Read full review

The Fitbit Flex is a cool-looking, lightweight wristband that tracks and monitors your daily activity and sleep patterns. It syncs with a desktop dashboard and mobile app to give you up-to-date activity data in gorgeous graphs. You can compete with Fitbit-using friends and even upgrade to a premium Daily Trainer service. I found the Fitbit Flex gave me added motivation to walk or run that bit further, and keep an eye on my weight and fitness activities. It’s addictive and fun, and if that gets you moving more and generally fitter and leaner it’s better for you than most other computing or mobile devices. Also consider the next step up: the Fitbit Charge also counts floors climed, and shows you your stats right there on your wrist.

Read full review

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The Guardian

A weight loss tracker that makes fitness a habit

from The Guardian

At first glance, Flex seems little more than a souped-up pedometer. Since the only "activity" it can really measure is walking, it's no magical time-saver; I still have to painstakingly input any other exercise I do. It claimed that in "night-time" mode it could reveal my sleeping patterns, but the first night I wore it, it failed to notice I'd lain awake three hours with insomnia. Then there's the mystery of the scales. Sometimes, perhaps when I've skipped a day, they don't recognise me and measure me as a "guest user". The weight they record is almost invariably a couple of pounds more than what they accord to "EJ", which makes me doubt its accuracy and intentions.

Yet it works. The app and online "dashboard" are nicely presented and easy to use, but most days I just keep an eye on the blinking dots on my wrist. If they seem especially low, I do a couple of laps of the office. I walk into work on days I'd otherwise catch the bus. And I lose my 5lbs slowly, sensibly, over two months.

Was technological wizardry the key to my success? I don't believe so. Fitbit's real secret is to make you more intentional about parts of your life you'd normally ignore. I changed what I ate and chose to do exercise, because it was setting me challenges, and keeping me focused on them throughout the day. You don't need expensive gadgetry to do that. But in the case of this serial exercise-denier, it was just the habit-change I needed. 

Read full review

At first glance, Flex seems little more than a souped-up pedometer. Since the only "activity" it can really measure is walking, it's no magical time-saver; I still have to painstakingly input any other exercise I do. It claimed that in "night-time" mode it could reveal my sleeping patterns, but the first night I wore it, it failed to notice I'd lain awake three hours with insomnia. Then there's the mystery of the scales. Sometimes, perhaps when I've skipped a day, they don't recognise me and measure me as a "guest user". The weight they record is almost invariably a couple of pounds more than what they accord to "EJ", which makes me doubt its accuracy and intentions.

Yet it works. The app and online "dashboard" are nicely presented and easy to use, but most days I just keep an eye on the blinking dots on my wrist. If they seem especially low, I do a couple of laps of the office. I walk into work on days I'd otherwise catch the bus. And I lose my 5lbs slowly, sensibly, over two months.

Was technological wizardry the key to my success? I don't believe so. Fitbit's real secret is to make you more intentional about parts of your life you'd normally ignore. I changed what I ate and chose to do exercise, because it was setting me challenges, and keeping me focused on them throughout the day. You don't need expensive gadgetry to do that. But in the case of this serial exercise-denier, it was just the habit-change I needed. 

Read full review

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iMore

Comfortable to wear, great battery life

from iMore

The Fitbit Flex is one of the most versatile trackers when it comes to style but it isn't the best on the market where accuracy is concerned. Unforunately I had a similar experience with the Force which concerns me and makes me lean towards other offerings instead.

Read full review

The Fitbit Flex is one of the most versatile trackers when it comes to style but it isn't the best on the market where accuracy is concerned. Unforunately I had a similar experience with the Force which concerns me and makes me lean towards other offerings instead.

Read full review

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Amazon.com Reviews Summary

22,566 from Amazon.com

22,566 Amazon.com shoppers shared a review for the Fitbit Flex. Ratings are middle of the road, averaging 3.7 out of 5 stars. See all Amazon.com customer reviews.

7.4/10

Amazon.ca Reviews Summary

2 from Amazon.ca

2 Amazon.ca shoppers shared a review for the Fitbit Flex. Ratings are generally negative, averaging 1 out of 5 stars. See all Amazon.ca customer reviews.

2/10

Amazon.co.uk Reviews Summary

7 from Amazon.co.uk

7 Amazon.co.uk shoppers shared a review for the Fitbit Flex. Ratings are generally positive, averaging 4.3 out of 5 stars. See all Amazon.co.uk customer reviews.

8.6/10

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