Fitbit Flex Reviewed for Performance and Quality
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By Tali Treece All Fitbit Watches 
Fitbit Flex Reviewed for Performance and Quality Review Facts
The Fitbit Flex hit the market back in 2013. It was the first wristband fitness tracker from Fitbit, taking all the features customers had loved in the Fitbit One and Fitbit Zip and putting them into a band that could be worn comfortably and conveniently on the wrist.
While Fitbit’s wristband fitness trackers seem like a given now, it’s pretty exciting to realize they became available to consumers just four years ago! In small but significant ways, they transformed the idea of wearable trackers. For one thing, people no longer had to be concerned that a little clip-on Zip would fall off a belt loop or waistband with the wearer being none the wiser. Another benefit was that you could wear the wristband regularly, allowing for sleep tracking throughout the night. Of course, all of this is old news now.
But the Fitbit Flex remains something of a historical item in the realm of fitness. And, because it’s an older model, you buy it at a much lower price. While the Fitbit Flex is hardly cutting edge technology, this comfortable and straightforward wristband tracker remains an excellent choice for any person who’s looking to become more aware of his overall health and fitness.
Keep reading our in-depth Fitbit Flex review to find out if it is worth the investment.
Editor's Pros & Cons
Pros
- Low cost
- Tracks steps, distance, and calories
- Monitors sleep
- Tracks active vs. stationary time
Cons
- Lacks basic features
- Can be difficult to fasten strap
Activities
Activities
Because of its step tracking abilities, this product is best for walkers, joggers, and runners. But one of the beautiful things about Fitbit products is how versatile they are. While many wristband fitness trackers are designed and intended for runners alone, Fitbit makes their products with all levels of athlete in mind.
While their products probably aren’t the best for serious athletes, let’s face it — the average person is not a serious athlete. Most people are merely striving to make health and fitness a more significant part of their daily lives.
The Fitbit Flex is here to help. It tracks your steps, records your distance, watches your calories.
It even lets you know how long you’ve been active and how long you’ve been sitting still. The Fitbit Flex also tracks your sleep, so you can learn how long you slept and at what times you slept best.
While their products probably aren’t the best for serious athletes, let’s face it — the average person is not a serious athlete. Most people are merely striving to make health and fitness a more significant part of their daily lives.
The Fitbit Flex is here to help. It tracks your steps, records your distance, watches your calories.
It even lets you know how long you’ve been active and how long you’ve been sitting still. The Fitbit Flex also tracks your sleep, so you can learn how long you slept and at what times you slept best.
Basic Features
Basic Features
Like most of Fitbit’s other fitness trackers, the Flex is primarily a step tracker, but it is by no means limited to this. In addition to tracking your steps, it records your distance - this means you get to know not only how many steps you took in a day, but how that translates into miles or kilometers.
It also lets you know how many calories you burned, based on the personal data (i.e., height, age, and weight) you enter into the app when you first set up your Fitbit Flex, plus the activity you’ve accomplished in a given day.
The Fitbit Flex tracks your active (calorie-burning!) minutes versus your stationary time (all that time you're productive at other things, of course), so you can be aware of how much time you spend sitting around and how often you get up and move. Of course, you can’t be on the go all the time.
Especially at night, when what’s healthiest is to be lying still. Sleeping. The Fitbit Flex works for you even then, with its sleep-tracking capabilities. When you sync to the app, you’ll be able to see when you were sleeping soundly and when you were tossing and turning.
It also lets you know how many calories you burned, based on the personal data (i.e., height, age, and weight) you enter into the app when you first set up your Fitbit Flex, plus the activity you’ve accomplished in a given day.
The Fitbit Flex tracks your active (calorie-burning!) minutes versus your stationary time (all that time you're productive at other things, of course), so you can be aware of how much time you spend sitting around and how often you get up and move. Of course, you can’t be on the go all the time.
Especially at night, when what’s healthiest is to be lying still. Sleeping. The Fitbit Flex works for you even then, with its sleep-tracking capabilities. When you sync to the app, you’ll be able to see when you were sleeping soundly and when you were tossing and turning.
Advanced Features
Advanced Features
The Fitbit Flex is a pretty basic product. It keeps things simple and straightforward. At the time of its launch, many of Fitbit Flex features were advanced, but since then technology has rapidly advanced, as it’s wont to do.
Now its most advanced features are basic when compared with other products. It is not, however, a jibe against it. The basic technology is accessible to a larger demographic than the newest and most advanced products. As mentioned in the introduction, this is a fitness tracker for the average person.
Now its most advanced features are basic when compared with other products. It is not, however, a jibe against it. The basic technology is accessible to a larger demographic than the newest and most advanced products. As mentioned in the introduction, this is a fitness tracker for the average person.
Accuracy
Accuracy
The accuracy of the Fitbit Flex remains questionable. When worn alongside other watches for fitness, such as the Jawbone Up, it records generously more steps than the other trackers.
When you count a smaller number of steps for comparison, however, it fares better. While this uncertainty about the precise accuracy of the tracker is frustrating, many people won’t be bothered by a few steps added or subtracted here or there.
The Fitbit Flex is not designed for highly specific training, but for people looking to gain a better fundamental understanding of their overall personal fitness.
When you count a smaller number of steps for comparison, however, it fares better. While this uncertainty about the precise accuracy of the tracker is frustrating, many people won’t be bothered by a few steps added or subtracted here or there.
The Fitbit Flex is not designed for highly specific training, but for people looking to gain a better fundamental understanding of their overall personal fitness.
Connectivity
Connectivity
The Fitbit Flex connects through Bluetooth wireless syncing, so there’s no need to plug it into your phone or computer as you have to do with both the Fitbit One and Fitbit Zip. The Flex occasionally wakes up and connects itself to your phone, so all your fitness stats can stay updated automatically.
While Fitbit has substantially improved the connectivity of the Flex and continues to do so, it still isn’t able to all mobile devices, such as the Xperia Z2. It is a deterrent for any would-be purchasers who own incompatible devices. But there is a solution, even if not a particularly elegant one: the Flex comes with a USB dongle that can connect it to both PCs and Macs.
Syncing your Fitbit Flex to computer and phone is only one level of connectivity.
The Fitbit Flex also helps you connect with fellow fitness-minded friends and colleagues. When you log into your Fitbit Flex account, you will automatically see how others are doing in accomplishing their goals. Sometimes a little dose of healthy competition is all you need to speed up your pace and ramp up those steps!
While Fitbit has substantially improved the connectivity of the Flex and continues to do so, it still isn’t able to all mobile devices, such as the Xperia Z2. It is a deterrent for any would-be purchasers who own incompatible devices. But there is a solution, even if not a particularly elegant one: the Flex comes with a USB dongle that can connect it to both PCs and Macs.
Syncing your Fitbit Flex to computer and phone is only one level of connectivity.
The Fitbit Flex also helps you connect with fellow fitness-minded friends and colleagues. When you log into your Fitbit Flex account, you will automatically see how others are doing in accomplishing their goals. Sometimes a little dose of healthy competition is all you need to speed up your pace and ramp up those steps!
Apps
Apps
Remarkable Fitbit Flex features are their app and website interface. Fitbit Flex is designed to be used in conjunction with the app and the website, and both these sites are intuitive, elegant, and customizable. With both the app and the website, you can look at your stats (i.e., steps, distance, calories) over several days, weeks, months, and even a full year.
In addition to viewing your progress, you can use the app to track your food intake. The app’s built-in food database is rather hit and miss, but you can connect to third-party apps such as MyFitnessPal to have access to a greater variety of food data. You can also connect to many other third-party apps, like Strava, MapMyRun, and RunKeeper.
In addition to viewing your progress, you can use the app to track your food intake. The app’s built-in food database is rather hit and miss, but you can connect to third-party apps such as MyFitnessPal to have access to a greater variety of food data. You can also connect to many other third-party apps, like Strava, MapMyRun, and RunKeeper.
Comfort
Comfort
With its slim size, soft rubber band, and lightweight, the Fitbit Flex is indeed comfortable. It is so comfortable that it’s easy to forget you’re wearing it at all.
It is no problem, though, because the Fitbit Flex is genuinely water-resistant. You can walk through the pouring rain, wash the dishes, and even hop in the shower without worrying that you will destroy your fitness tracker.
It is no problem, though, because the Fitbit Flex is genuinely water-resistant. You can walk through the pouring rain, wash the dishes, and even hop in the shower without worrying that you will destroy your fitness tracker.
Style
Style
The Fitbit Flex doesn’t win many points for style from reviewers. Made of thin rubber, it looks more like the sort of rubber bangle you get at a music festival than it does a sleek watch or a beautiful bracelet.
Although not particularly stylish in and of itself, it is slim enough that it’s really not too noticeable, or even overtly sporty, as a Garmin or Apple smartwatch would be.
Although not particularly stylish in and of itself, it is slim enough that it’s really not too noticeable, or even overtly sporty, as a Garmin or Apple smartwatch would be.
Durability
Durability
The band itself generally holds up well, but some users did notice wear and tear after only a few weeks of use. Users also noted that the plastic screen tends to get scratched and cloudy after only a short time of application.
Face
Face
The Flex does not have a traditional watch face with numbers telling the time, or step count, or calories. Instead, it has a dark plastic sliver at the top of the band.
Beneath this plastic is five tiny LED lights which communicate your stats. Rather than being attached to the rubber band itself, these LED lights are the topmost (and the only visible) part of the tracker’s “brain.”
This tracker is considerably smaller than the One and the Zip that came before it, in part because of the almost total lack of “watch” face.
Beneath this plastic is five tiny LED lights which communicate your stats. Rather than being attached to the rubber band itself, these LED lights are the topmost (and the only visible) part of the tracker’s “brain.”
This tracker is considerably smaller than the One and the Zip that came before it, in part because of the almost total lack of “watch” face.
Band
Band
Like most other Fitbits, the band is made of soft, flexible rubber. The “brain” of the tracker fits into the band right around where a normal watch face would be, and since you can take this “brain” in and out, the band is replaceable.
There is an array of colors available for the Flex band, from neon orange to steel blue.
To fasten the band, you press the two nobs on the end of one strap into the holes on the other side. These holes are close together, giving you the ability to get the band just as tight or loose as you like it.
Unfortunately, the band can be challenging to clasp, especially on the first few tries. It requires an unusual amount of force to get the nobs into the holes. But, once on, it’s not going anywhere — and since it’s water-resistant and tracks both waking and sleep activity, you’ll have little reason to take it off.
There is an array of colors available for the Flex band, from neon orange to steel blue.
To fasten the band, you press the two nobs on the end of one strap into the holes on the other side. These holes are close together, giving you the ability to get the band just as tight or loose as you like it.
Unfortunately, the band can be challenging to clasp, especially on the first few tries. It requires an unusual amount of force to get the nobs into the holes. But, once on, it’s not going anywhere — and since it’s water-resistant and tracks both waking and sleep activity, you’ll have little reason to take it off.
Sizes Available
Sizes Available
The Fitbit Flex is available in two different sizes: small and large. Size small fits wrists 14 -16.5 cm. Size large fits wrists 16.5 - 21 cm. Because there are multiple sizing holes along the strap, there is plenty of flexibility when it comes to sizing. The band is 15.2 mm full in both the small and large.
Ease of Use
Ease of Use
To charge the Fitbit Flex, you will need to take it out of the wristband it’s cased in. Thanks to the flexible rubber of the strap, popping the tracker in and out is no trouble at all.
Unfortunately, getting the Flex into sleep mode at night isn’t quite so simple. For the Flex to start tracking your sleep, you have to tap the screen six times - at the right speed! Go too fast or too slow and it won’t register what task you’re asking of it.
Viewing your stats, however, is much more comfortable. Just tap the screen with your fingertip, and the LEDs will light up to show your progress on a scale of one to five.
Unfortunately, getting the Flex into sleep mode at night isn’t quite so simple. For the Flex to start tracking your sleep, you have to tap the screen six times - at the right speed! Go too fast or too slow and it won’t register what task you’re asking of it.
Viewing your stats, however, is much more comfortable. Just tap the screen with your fingertip, and the LEDs will light up to show your progress on a scale of one to five.
Power Source
Power Source
A rechargeable battery powers the Fitbit Flex. This battery lasts up to 9 days before you need to recharge it. Included with your purchase of the Fitbit Flex are a USB cable and a socket adapter.
Connect the power cord the to three metal contacts on the end of the tracker, opposite from the LED lights, then plug into your computer to begin charging.
Connect the power cord the to three metal contacts on the end of the tracker, opposite from the LED lights, then plug into your computer to begin charging.
Price
Price
Now that Fitbit has launched the Flex 2, you can buy the original Fitbit Flex at almost half the price for which it was initially sold.
Unfortunately, however, the Fitbit Flex does not have an altimeter, which tracks steps on stairs. The Fitbit One does have an altimeter and sells for the same price as the original Flex, but it is not a wristband.
Unfortunately, however, the Fitbit Flex does not have an altimeter, which tracks steps on stairs. The Fitbit One does have an altimeter and sells for the same price as the original Flex, but it is not a wristband.
Accessories
Accessories
Fitbit Flex offers an array of colors for the band, so you have to option of accessorizing with different-colored bands for different-colored outfits.
Third-party sellers offer stylish band options, such as the leather wrap bracelet from Charming Charlie, and bling-filled handmade bands from sellers on Etsy.
Third-party sellers offer stylish band options, such as the leather wrap bracelet from Charming Charlie, and bling-filled handmade bands from sellers on Etsy.
Key Features
Key Features
Tracks steps, distance, and calories
Tracks stationary vs. active time
Tracks sleep
Comfortable, lightweight wristband
Water-resistant
Tracks stationary vs. active time
Tracks sleep
Comfortable, lightweight wristband
Water-resistant
Bottom Line
Bottom Line
When it first arrived in the world, the Fitbit Flex was something of a groundbreaker in wearable fitness tracking technology. But just a few years later, as often happens with "new" technology, it’s no longer breaking news. It’s missing some desirable features, such as the ability to calculate steps on stairs.
Overall, however, the Fitbit Flex remains a stable fitness tracker. With its comfortable band and slim design, it appeals to people of all ages. It counts steps, calculates distance, lets you know how many calories you’ve burned. It tracks stationary versus active time.
It’s even got your back through the night, as it monitors your sleep levels. So, although the Flex is not the newest and shiniest product on the market, it remains an excellent choice for anyone looking for a wristband step tracker that is easy to use, comfortable, convenient, reliable, and affordable.
If you are looking to pay more attention to your fitness, to inspire yourself to work harder and achieve your goals, fastening a Fitbit Flex around your wrist is a great way to start.
Overall, however, the Fitbit Flex remains a stable fitness tracker. With its comfortable band and slim design, it appeals to people of all ages. It counts steps, calculates distance, lets you know how many calories you’ve burned. It tracks stationary versus active time.
It’s even got your back through the night, as it monitors your sleep levels. So, although the Flex is not the newest and shiniest product on the market, it remains an excellent choice for anyone looking for a wristband step tracker that is easy to use, comfortable, convenient, reliable, and affordable.
If you are looking to pay more attention to your fitness, to inspire yourself to work harder and achieve your goals, fastening a Fitbit Flex around your wrist is a great way to start.
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