5 Best Fitbit Fitness Trackers

Updated Dec 2024

Fitbit Fitness Trackers are THE ultimate fitness tracker in the market. AskMjareb tested and reviewed the whole line of Fitbit Fitness Trackers to bring you the most thorough Fitbit comparison on the web.

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Best of the Best

Fitbit Charge 2

Fitness Tracker

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SUMMARY

PROS

CONS

SUMMARY

The Charge 2 features an OLED screen that’s four-times bigger than the original Charge Fitbit Fitness Tracker – so you can view all your data from its multi-sport and heart-rate tracking capability right from your wrist. The vast available array of switchable colored elastomer and leather bands make the Charge 2 a snazzy fashion choice as well.

PROS

Stopwatch and user-controlled tracking for flat and stair-steps, water intake, calories burned, distance, and altitude, and even sleep-stages. Pairs well with bluetooth enabled IOT devices, and forwards calls, SMS’, Whatsapp and Facebook messages from your smartphone.

CONS

The Charge 2 is not water resistant, so there’ll be no swimming with this device, and if it rains while you’re out running, you’ll have to quickly stash it somewhere. Also, there is no GPS, quite a surprise for a device if this caliber.

Best Value

Fitbit Flex 2

Fitness Tracker

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SUMMARY

PROS

CONS

SUMMARY

With the best Fitbit price of the entire fitness tracker family, the Flex 2 is designed to be ultra-lightweight with a slim, body-hugging design. Water resistant down to 50 meters, use the Flex 2 while biking in the rain mountains and while surfing the breakers – and everywhere in between!

PROS

Weighing only 23 grams, the Flex 2 tracking unit can be removed from its comfortable elastomer band – and can track your steps and sleep instead within a fashionable silver or gold-plated bangle or pendant.

CONS

Designed without a screen, but rather a series of five color-coded lights, the Flex 2 will require you to check your tracked data via the well-designed Fitbit app on your smartphone.

Fitbit Alta HR

Fitness Tracker

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SUMMARY

PROS

CONS

SUMMARY

Offering the same slim, attractive design as the standard Alta, the Alta HR boasts an advertised 7-day battery life along with added heart-rate tracking every five seconds throughout your day. Auto-tracking for a plethora of activities, and swappable bands come in colorful elastomer, leather, and even metal.

PROS

Although the screen isn’t touch sensitive, Alta HR lets you check your fitness stats by tapping the tracker casing below the display. On the app you can check more in-depth stats, including your VO2 Max oxygen-use score!

CONS

The monochrome LED display is too small to see push notifications from your phone easily. Also, users may miss the altimeter and once-per-second heart-rate monitoring they enjoy with the Charge 2.

Fitbit Alta

Fitness Tracker

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SUMMARY

PROS

CONS

SUMMARY

The Alta presents a slimmer, more attractive update on the classic Fitbit Charge, and our testers noticed 7 days of high-caliber use without a recharge (instead of only 5). The tracker gently vibrates when you receive a call, SMS, messenger, Whatsapp, or calendar notification on your phone with a short text update on the monochrome LED screen.

PROS

Detects and tracks a diverse list of activities such as walking, running, biking, soccer, basketball, tennis, even dancing, kickboxing and Zumba. Automatically vibrates after every 50 minutes of inactivity to remind you to move for at least 2-3.

CONS

There are no manual controls on the device, so no stopwatch capabilities. And you’ll have to revert to the Fitbit Fitness Tracker app on your smartphone to change the devices’ settings. The Alta is not water-resistant.

Fitbit Ace

Fitness Tracker

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SUMMARY

PROS

CONS

SUMMARY

With profiles now available for kids as young as 8 years old, the Fitbit Ace Fitness Tracker offers all the core features you’ll want for your child: step, distance and activity tracking, sleep monitoring; even a ‘Reminder to Move’ if they sit in one place too long!

PROS

Robust bluetooth pairing for your smartphone gives your kid a chance to challenge and compete with family members, and even receive real-time call notifications. The child-sized band can easily be switched for a larger one as your child grows.

CONS

The device is water-resistant, not waterproof, so not recommended for swimming, or dropping in the bath. Also, the app is not yet set up for kids to be able to challenge and compete against non-family-members, say their friends from school.

Shop For The Best Fitbit Fitness Tracker For You

When doing Fitbit comparison shopping in order to select the best fitness trackers for your family, there are a number of important factors to consider:
First of all, what is the size of the intended user? For wrist sizes up to 16 cm in circumference, you should stick with the Fitbit Ace (usually kids and slender adults). For larger kids, teens, and adults (16.5 cm in wrist-circumference and above), you can go for any of the other devices in this guide.
Next, you should consider which activities you plan to track, and select a Fitbit device accordingly. For those wanting to track a broad range of activities such as dancing, cycling, elliptical training, and tennis, your best fitness watch could be the Fitbit Charge 2, or the Fitbit Alta or Alta HR. By contrast, if you want to track a narrow range of specialized water-based activities and don’t need even a simple watch display, go for the Fitbit Flex 2, which is currently the best fitness band on the market, and is waterproof down to 50 meters.
Third, do you need a heart-rate monitor? If so, go for the Fitbit Charge 2 or the Fitbit Alta HR.
Fourth, consider the user-interactivity for the tracker you’re interested in. If you want a very low level of interaction with your tracker while wearing it, go for the screenless Fitbit Flex 2, which sends you notifications solely through a system of 5 colored lights. The Fitbit Alta, Alta HR and Fitbit Ace, offer fairly limited interactivity with the display, but you can view your time, fitness stats and phone notification data quite simply. For those looking for a high level of interactivity and control over their Fitbit Fitness Tracker, go for the Charge 2 with multiple user controls and a large OLED display.

How We Decided

We purchase every product we review with our own funds — we never accept anything from product manufacturers.

Models Reviewed

Experts Interviewed

Consumers Consulted

Fitbit Fitness Tracker - Our Experts Advise

For a stylish, swim-friendly device with the best Fitbit price out there…: go for the best fitness band available, the Fitbit Flex 2. It’s safe to use in water down to 50 meters, so you’ll never have to take it off – not while diving, swimming laps or even just in the shower or sauna. With its super-svelte and non-obtrusive design, you might even forget you’re wearing it, but if you want to be noticed, opt for the fashion-forward bangle or pendant housings.
For a full-featured device which gives you ultimate control…: get the Fitbit Charge 2. The only Fitbit HR (heart-rate) device reviewed here which includes an altimeter, the Charge 2 also gives you stopwatch capabilities, and a full-range of data on its gorgeous sun-friendly OLED display.
For a fashion-ready tracker with a broad range of fitness features…: opt for the Alta HR. The slim, pared-down design along with the wide assortment of changeable and elegant straps means you’ll be at home with this Fitbit HR in the gym, on the soccer field, or even at a wedding.
For your little athletes who deserve nothing but the best…: get them each their own Fitbit Ace. With the same great activity tracking and sleep-tracking features as the Fitbit Alta but with custom watch bands and application design just for kids, you’ll be able to share fitness challenges and successes with the whole family!

Fitbit Fitness Trackers Features

Battery Life. Lithium polymer battery ranges from 4-5 days with the Fitbit Charge 2, Ace, and Flex 2, and up to 7 days with the Alta. There simply isn’t a poor performer on our list.
Band Length. Fitbit fitness tracker watches feature interchangeable bands, so you can easily switch from small (14 cm – 16.5 cm) to large (16.5 cm – 19.5 cm) or even to XL (19.5 cm – 22.5 cm) and back again. You can even freely interchange the child-sized Ace watchband (12 cm -16 cm) with the larger Alta watch bands as your child grows!
Display. The Charge 2 Fitbit watch features an OLED activity tracker display which looks good in even the brightest sunlight. The Ace, Alta and Alta HR feature a harder-to-read monochrome LED display. The Flex 2 has no screen display at all – just a row of 5 colored indicator lights.
Bulk. From the full-sized Charge 2 Fitbit watch to the slimline Alta 2, to the ultra-discrete Flex 2, the Fitbit offers a range of different tracker sizes.
Water-Resistance. While the Ace, Alta, Alta HR and Charge 2 are ‘splash, sweat and rain proof,’ the Flex 2 is the only Fitbit that is actually swim-friendly..
Sensors. All Fitbit Fitness Trackers use a three-axis accelerometer and a step tracker. Some specialty trackers like the Alta HR include a heart-rate tracker. Others, like the Charge 2, also include an altimeter.
Communications Protocol. The entire family of Fitbit Fitness Trackers uses Bluetooth 4.0, so you know you’re getting the best in technology.
Smartphone Compatibility. Fitbit has released versions of its flagship smartphone app for iPhone, Android and Windows, so no matter what phone you have, you’ll be able to sync your Fitbit device with your phone.