Many of us are looking to buy an activity tracker to get fitter, healthier and maybe a little lighter. There are many fitness trackers out there but Fitbits are considered among the best with good reason. There are several Fitbit trackers and smartwatches ranging in price, features and design to suit every budget, need and taste.
Whether you simply want to track your steps pedometer-style, see how well you’re sleeping, monitor your heart rate or compete against your friends, a Fitbit is a subtle, affordable accessory. And new health features look further into your heart and wellbeing, as well as stress levels and illness potential.
The very latest Fitbit smartwatches (Sense and Versa 3) can even enable calls right there on your wrist, and work with both Alexa and Google Assistant voice controls.
Owning a Fitbit is going to motivate you to exercise more, and even get a better night's sleep. We've tested every Fitbit ever launched, and we're going to tell you which is the best Fitbit for you. We've even included some of the older Fitbits that have been discontinued but are still available at online retailers.
Fitbit's most recent new devices are two new health smartwatches - Fitbit Sense and Fitbit Versa 3 - and a new activity tracker, the Fitbit Inspire 2, which replaces the Inspire and Inspire HR. Read our Fitbit Sense review, Fitbit Versa 3 review and Fitbit Inspire 2 review.
You can find out more about which to buy by reading our Fitbit Sense vs Fitbit Versa 3 comparison, and our look at the differences between the Fitbit Inspire 2 and Fitbit Charge 4 activity trackers.
We’ve tested and reviewed every Fitbit that the company currently sells and ranked them in order. That isn’t to say the Fitbit at number one is the one for you - it’s just the best one for most people - so think about what you want from an activity tracker or fitness smartwatch.
We’ve assigned each Fitbit a ‘Best For’ tag to see if that one suits your needs better - for instance, if you want built-in GPS, then look to the Charge 4, Versa 3 and Sense, and the now discontinued but still available Ionic). There are also links to buy from reputable retailers at the best prices and links to our full reviews of every model.
Find more in-depth buying advice below our chart.
Best Fitbit reviews
1. Fitbit Versa 3 - Best Fitbit fitness smartwatch
The Fitbit Versa 3 covers all the aspects of a fitness watch, measuring steps, heart rate, distance, calories burned, floors climbed, active minutes, hourly activity, and sleep, with plenty of extra health features (such as Sp02 blood-oxygen readings), plus a built-in GPS for those who outdoor exercise without their phone.
It offers on-screen notifications from your phone, silent alarms, cardio fitness levels, workout and other exercise modes such as swimming and weights, female health tracking, and wellness features, plus music controls and Amazon's Alexa and Google voice assistant.
You can even take and respond to phone calls on your wrist, as it has a built-in microphone and speaker.
It matches the more expensive Fitbit Sense on all fitness features and most health functions, too. And its screen is just as large and bright.
While the Sense has more detailed health apps and sensors such as EDA, ECG and Skin Temperature, plus stress-management tools, we think these are over the top for most users, and the Versa 3 range of features is more than enough, and at a much better price.
It's our favourite Fitbit, as it has a great screen and all the Fitness features found in even the top-end Fitbit Sense.
Read our full Fitbit Versa 3 review
2. Fitbit Inspire 2 - Most affordable Fitbit
The Fitbit Inspire 2's fitness feature set covers the basics very well - steps, calories burned, Active Zone Minutes, distance travelled, heart rate, advanced Sleep Stages measurement, swim tracking, guided relaxation breathing, the ability to auto-detect workouts with reasonable accuracy, and notifications.
It lacks a built-in GPS found in the Charge 4, Versa 3 and Sense but will connect to your phone's GPS just like the top-end Fitbits. Sure, it lacks an altimeter (so won't count the floors you climb), but otherwise is just as capable as the more expensive Charge 4.
The heart-rate monitor deepens the device's exercise analysis and makes its sleep tracking far more sophisticated. If activity tracking is what you're after, the Fitbit Inspire 2 delivers in an affordable package.
This is a great price for a light, smart-looking device with a solid feature set. Fitness fanatics will want something more advanced, such as the Versa 3 or Sense, but for most of us the Inspire 2 will be all we need.
Read our full Fitbit Inspire 2 review
3. Fitbit Charge 4 - Best all-round Fitbit that's not a smartwatch
The Charge 4 is easily our best all-round Fitbit activity tracker, and indeed a match for even Fitbit's smartwatches. It covers all the basics - tracking steps, distance, calories burned, hourly activity, floors climbed, heart rate, swim-tracking, and advanced sleep, not to mention it has most of the top-end exercise features too, including Active Zone Minutes.
Yes, it lacks the larger, easier-to-read colour screen you get with a Fitbit smartwatch, but its built-in GPS means it's a tracker that can match the pricier smartwatches.
It can take Sp02 blood-oxygen readings just like the Fitbit smartwatches, but not take calls like the Sense and Versa 3 can.
Choose the Charge 4 if you can live with the smaller, monochrome screen.
Read our full Fitbit Charge 4 review
4. Fitbit Sense - Best Fitbit for health tools
The Fitbit Sense sits at the top of the pile for sheer number of features, and stands out especially for its detailed health functions - and for its heftier price tag.
These include an Electrodermal Activity (EDA) sensor that can measure the intensity of emotion (important for stress management), Electrocardiogram (ECG) app to assess your heart for heart-rhythm irregularity, and a Skin Temperature sensor that can be used to indicate the onset of a fever or illness.
The Sense is the only Fitbit to offer High and Low heart-rate notifications.
It boasts all the fitness features and smart apps found in the other Fitbits (and is more accurate at swim tracking with its gyroscope) and is the standout Fitbit smartwatch for health measurements and insights, although some readings require a Fitbit Premium subscription.
Read our full Fitbit Sense review
5. Fitbit Ace 2 - Best Fitbit for Kids
The Fitbit Ace 2 is designed especially for younger children. It's a well-priced if basic activity tracker. It lacks the more advanced health measurements you’ll find on the pricier Fitbits but it has enough to motivate a family to up their exercise.
Until recently children under 13 were not allowed to have a personal Fitbit account. Now the minimum age is 6 – as long as you use the Fitbit Ace 2, which measures Steps and Active Time, plus basic sleep monitoring.
Special family account features mean kids (and parents) can track their basic activity stats through secure Kid View and Parent Views, where they can see their progress, compete in challenges, and earn badges.
The Ace is about exercise, not just weight loss - Fitbit hides the calorie counter to stop children obsessing about their weight. Older kids might prefer a Fitbit that does more, such as measuring their heart rate.
Read our full Fitbit Ace 2 review
6. Fitbit Versa 2
Not much more than a year old but replaced by the Versa 3, the older Versa 2 is still a great fitness smartwatch.
It has nearly all the features found on the Versa 3 but does lack the built-in GPS, although it can connect with your phone's GPS.
The Versa 3 claims more accurate heart-rate measurements, which could be sway newcomers to the latest model, but probably not existing Versa 2 users.
It can work with Amazon's Alexa voice assistant, but not the Google Assistant, which is available to the Versa 3. It also lacks the ability to take calls on the wrist, another Versa 3 benefit.
If you find a Versa 2 at a great price, we still rate it as a great fitness smartwatch - not as great as the Versa 3 but only a couple of features behind.
Read our full Fitbit Versa 2 review
7. Fitbit Inspire - discontinued but still available
Despite it being discontinued and replaced by the much more feature-filled Inspire 2, we'd happily recommend the Fitbit Inspire to a casual fitness enthusiast, since it's affordable, smart-looking and easy to use. And, of course, it works with Fitbit's fantastic mobile app.
It tracks your basic steps, distance, active minutes and calories burned, and offers on-wrist notifications including Caller ID, texts and calendar alerts.
But be warned that you don't get a lot by way of advanced fitness features: there's no GPS, no heart monitor, no altimeter. If you can live without these, this is a sensible money-saving option if you can find a great deal.
Read our full Fitbit Inspire review
8. Fitbit Ionic - discontinued but still available
While now discontinued, the Fitbit Ionic is a fully featured Fitbit smartwatch and activity tracker. It has a built-in GPS, which is great for runners or exercisers who don’t want to lug their phone around with them. Newer Fitbits, such as the Sense, Versa 3 and even the Charge 4 activity tracker, also boast the built-in GPS.
As well as all the usual fitness stats it features automatic multi-sports tracking, on-screen workouts, Caller ID and texts notifications on wrist, can store up to 300 songs with music control and be used for contactless payments, as well as choosing from a range of special apps (Weather, Starbucks, Runkeeper, Strava, and more).
Read our full Fitbit Ionic review
9. Fitbit Versa Lite - discontinued but still available
The discontinued Versa Lite is physically the same as the original Versa except for the lack of two buttons on the right edge. Inside, it loses a few features: Wi-Fi, altimeter, Fitbit Coach on-screen workouts and the ability to store music.
But wait! It's still pretty excellent, and we didn't miss any of those features. It's cheaper, lasts for four or five days on a single charge (not as great as the latest Fitbit smartwatches but better than the Apple Watch's battery), looks great and has tons of compatible straps and accessories.
The Versa 2 and 3 have better screens, plus altimeter, sP02 readings, on-screen workouts and music, and other features.
The Versa Lite is a decent fitness smartwatch if you find it at a discount.
Read our full Fitbit Versa Lite Edition review
10. Fitbit Aria Air : Best Fitbit Scales
If you couldn’t care less about body fat percentage and other weight and body statistics, and just want your weight to be automatically synced to your Fitbit app, then the Fitbit Aria Air is the scale for you and will save you a fair bit on the slightly more able Aria 2 (which looks like it's being discontinued anyway).
You also get your Body Mass Index (BMI), too, but nothing else.
If you want to dig deeper and monitor your body fat percentage and a raft of other metrics such as body fat percentage, water %, muscle & bone mass, then look at our other best digital smart scales reviews.
Read our full Fitbit Aria Air review
Your buying guide to the best Fitbit
The benefits of getting more exercise cannot be exaggerated. Going for regular walks reduces the risk of heart attack or stroke by 31%. A study of 650,000 people found that being active for just 11 minutes a day after the age of 40 yielded 1.8 years of added life expectancy. Being active for an hour or more a day increased life expectancy by 4.2 years.
Exercise strengthens bones, boosts the immune system, lessens the risk of getting diabetes and a number of cancers (such as breast cancer), improves mood, and staves off senility. There is probably not a single organ in the body that does not benefit from exercise.
A healthy heart in our youth and middle age lowers the risk of developing dementia later in life, according to a study by Oxford University.
And it's not just physical - a 30-minute walk can prevent a build-up of stress during the day, as aerobic activities help keep levels of the stress hormone cortisol in check.
10,000 steps a day is the standard recommended goal, although this has little scientific basis. What's actually more important is how many minutes you are active in a day (experts recommend at least 150 minutes a week), and all the Fitbits measure this fitness metric, as well as steps. It's especially important if your exercise is on a bike, where steps don't really count.
The more sophisticated Active Zone Minutes measurement has now rolled out on all available new Fitbits, including the Sense, Versa 3, Charge 4 and Inspire 2, but you'll also find it on older Fitbits such as the Versa and Versa 2 as the FitbitOS updated them to the new metric, too.
Fitbits with the 24-hour heart-rate monitor (Inspire HR, Inspire 2, Charge 4, Ionic, Versa Lite, Versa 2, Versa 3 and Sense) feature Heart Rate Zones, Cardio Fitness Level, and Guided Breathing Sessions.
They also show advanced Sleep Stages data, including duration of Light, Deep and REM sleep, plus give a Sleep Score. Those without the HR (Ace 2, Inspire 1) offer more basic sleep tracking.
Read our full feature to learn more about all the Fitbit scores and measurements.
Other big news recently is that Google is buying Fitbit (for a cool $2.1 billion). We don't expect this to have much effect until later this year, and it certainly shouldn't put you off buying a Fitbit now, as the buyout should fund further improvements in future models - but not for at least a year.
Fitbit features compared
For kids below the age of 13, the Ace 2 is a well-designed, basic starter tracker. It's recommended for children aged 6 up, and there are special Parent and Kid views, plus family challenges and virtual badges to be won. Its strap is smaller than even the Small size options with the other trackers, but we found the other Fitbits fit a child's wrist just as well.
While it's in Fitbit's terms and conditions that children aged under 13 should use only the Ace, there are plenty of kids out there wearing "adult" models - parents just need to set-up the child's account using an older birth year.
The cheapest Fitbit wristband is the Inspire 2, but this lacks some features of the more expensive Fitbits, such as an altimeter to measure floors climbed and built-in GPS. But it is remarkably stuffed full of fitness functions for an entry-level device, and includes a heart-rate monitor so can measure your Cardio Fitness scores and Active Zone minutes, as well as insightful Sleep Stages recording. It can also be worn as a clip as well as a wristband, although the clip accessory costs an extra £19.99/$19.95.
You can find even cheaper trackers if you consider older Fitbit devices - don't worry, we've hunted down the Best Fitbit Deals for you.
If you do jog, run or exercise in any way as well as walking we think that it's worth paying for the extra heart-rate-monitoring functionality you get with all the latest Fitbits, except the Ace 2.
Monitoring heart rate can also be used if weight loss is one of your key goals. The heart-rate function also gives you much more detailed Sleep analysis - see further on for more details of this increasingly important health metric.
The Fitbit Sense and Versa 3 have built-in microphones and work with Amazon's Alexa and Google Assistant voice controls - the older Versa 2 works with Alexa only.
The Sense and Versa 3 also boast a speaker, and can receive phone calls when your iPhone or Android is close by. Phone calls on the wrist work surprisingly well.
If you're looking for weight tracking, then check out our Fitbit Aria Air review. These scales sync with the trackers to add measurements of your weight.
Which Fitbit trackers have certain features?
All Fitbits have an accelerometer that measures motion patterns to determine your calories burned, distance travelled, and steps taken. (The Fitbit Ace 2 does not show calories burned, as Fitbit doesn't want to add to a child's possible weight anxiety issues.) All monitor sleep quality, but those with a heart-rate monitor give much more sleep detail.
All the Fitbits also contain a vibration motor, which allows it to vibrate when alarms are set to go off.
The Charge 4, Versa 2, Versa 3, Sense and Ionic boast an altimeter that measures stairs (or height) climbed. The Ace 2 and Inspire 2 do not include an altimeter.
The Fitbit Sense, Versa 3 and Charge 4 are the only models in the lineup to have GPS built-in, without the need for a smartphone to be linked. Users can see distance, pace and elevation climbed, and review routes and split times. Like the Inspire 2, the older Inspire HR, Versa Lite and Versa 2 can connect to the GPS on your smartphone.
All current Fitbits monitor your heart rate on your wrist. They use Fitbit's PurePulse technology that gives continuous, automatic, wrist-based heart rate, plus simplified heart-rate zones (Fat Burn, Cardio and Peak). The Versa 3 and Sense use the updated and more accurate PurePulse 2.0.
Additionally, these heart-rate-tracking Fitbits feature Cardio Fitness Level, which provides a snapshot of your cardiovascular fitness. Based on estimated VO2 Max - calculated by your user profile, heart rate and exercise data - you can see how your fitness level relates to others of the same age and gender, and get guidance on how to improve over time.
The Charge 4, Versa 2, Versa 3, Sense and Ionic can also monitor the amount of oxygen in the blood (an important health indicator) with their Sp02 sensor.
Water Resistance and Swim Tracking
All the Fitbits are water-resistant up to 50 metres. The Inspire HR, Inspire 2, Charge 4, Versa 2, Versa 3 (not the Versa Lite edition) and Ionic will track your basic swimming metrics (laps, calories, etc) using distance to estimate strokes and laps. The new Fitbit Sense has a 6-axis gyroscope to more accurately track strokes and laps while swimming.
Caller ID and text messages
All the Fitbits show Caller ID when linked to a smartphone. All the wristbands except the Ace 2 also display text notifications and Calendar Events on its display. When you get a WhatsApp or Messenger text, your Fitbit can let you know, and even include the message on its screen, saving you the bother of reaching for your phone. This might also help prevent phone-theft on the street.
Automatic sport recognition
The Inspire HR, Inspire 2, Charge 4, Versa Lite, Versa 2, Versa 3, Sense and Ionic feature multi-sport exercise tracking. They know when you are cycling, running, hiking or playing sports including football, tennis and basketball. They will also recognise aerobic workouts such as Zumba, cardio-kickboxing and dance workouts, and log the workout in the Fitbit app along with an exercise summary.
SmartTrack automatically recognises and records workouts and captures all of the stats: how long you were active, calories burned and heart rate zones. By default, it recognises activities when you’ve been moving for more than 15 minutes. You can change this to anywhere from 10 to 90 minutes.
Reminder to Move
This is available on all the wristband Fitbit trackers. It encourages you to meet a mini-step goal of 250 steps each hour (approximately 2-3 minutes of walking). These prompts can be personalised to your schedule; for example, they can be put on “Do Not Disturb” during long meetings or appointments. And, of course, they won't wake you at night.
It's a great motivator to get up and move around, even if just for a stroll to get a glass of water or make a cup of tea. Studies have linked excessive sitting with being overweight and obese, type 2 diabetes, some types of cancer, and early death - I bet that made you sit up...
All the Fitbits check your sleep, too. They measure the time you spend asleep and check the quality of sleep – noting when you are restless or wake up during the night. Fitbit's newer Sleep Stages measurements (on Inspire HR, Inspire 2, Charge 4, Versa Lite, Versa 2, Versa 3, Sense and Ionic) utilise heart-rate variability to estimate the amount of time you spend in Light, Deep and REM sleep, as well as time awake each night, to better understand your sleep quality. Sleep Score rates each night's sleep from 0 to 100.
This is one of the great benefits of a tracker with a heart monitor, and sleep is now recognised as a major health metric. I actually look at this more than some of the other more obvious fitness metrics. Six to eight hours a day is the recommended amount of sleep you should be aiming for. Improved sleep has immediate benefits to your memory, attention, cognitive function, and decision-making capacity, as well as helping to avoid type 2 diabetes and putting on weight. Sleep deprivation causes our appetite to go up and we feel less full, making weight gain more likely.
Sleep can make us happier, improve heart health, boost memory, even reduce the risk of dementia. it is vital for restoring energy levels, washing out toxins from the brain and boosting the immune system.
Relax Guided Breathing
The Inspire HR, Inspire 2, Charge 4, Versa Lite, Versa 2, Versa 3, Sense and Ionic offer Relax Guided Breathing Sessions that can help calm your body and mind through two- and five-minute sessions personalised to your breathing rate. The benefits of guided breathing practice are supposed to help reduce stress and anxiety, as well as lower blood pressure. Add it to your daily routine, and you'll quickly feel the benefits. Long-term insulin resistance (caused by stress triggering the brain’s hypothalamus readying your body for action) contributes to the development of type 2 diabetes and obesity, so even light meditation has physical as well as mental benefits to our health.
Female Health Tracking
All but the Ace 2 offer Female Health Tracking, which helps women understand their body by using the tracker with the Fitbit app to follow their cycle, record symptoms and more.
Apps are available on the Fitbit smartwatches (Versa Lite, Versa 2, Versa 3, Sense, and Ionic), including Weather, plus extra third-party apps can be purchased via the Fitbit mobile app. All smartwatches except the Versa Lite also boast the Fitbit Coach app for on-screen video workouts. The Charge 4 also includes a more basic Weather app, and Agenda for calendars.
The Versa 3 and Sense also feature Amazon Alexa voice assistant, Google Assistant ("coming soon") and Spotify music. The Versa 2 also includes Spotify controls and Alexa. Charge 4 includes Spotify only. You need to be a Spotify Premium subscriber to take advantage of this feature.
Fitbit Pay is available for Charge 4, Versa 2, Versa 3, Sense and Ionic - but not the Ace 2 or Inspire 2, or the older Inspire 1 and HR or Versa Lite. This allows for contactless payments directly from the wearable. However, the list of compatible UK banks is very small right now, including Santander, Starling and Revolut - see the whole list here for all countries.
Which Fitbit has the best display?
The kid-friendly Fitbit Ace 2 measures only the basic stats: Steps and Active Minutes. It can also measure a child's Sleep patterns, and shows Caller ID, plus offers Reminders to Move.
The Inspire 2's touchscreen OLED display (below) shows Time; Steps; Heart Rate (Inspire HR and Inspire 2 only); Calories burned; Notifications such as Caller ID and texts; Exercise modes; Sleep; and Settings.
The Charge 4's touchscreen OLED display (along with the Charge 4's) shows Time; Steps; Heart Rate; Distance; Calories burned; Floors climbed; Active Zone Minutes; Caller ID; Text Notification; Weather; Agenda; and Alarm.
The Versa 2 and 3's colourful touchscreen display is even better for visual display of fitness stats.
The best and largest screens are found on the Versa 3 and Sense.
Both devices are equipped with a 1.58in display with a resolution of 336x336 pixels. In comparison, the display on Versa 2 is 1.39in with a resolution of 300x300 pixels.
The dimensions of the Sense and Versa 3 pebble are 40.48x40.48x12.35mm, compared to Versa 2’s dimensions of 39.95x39.84x12.15mm.
Which Fitbit has the best battery life?
All models have rechargeable batteries. Here's roughly how long each lasts between charges:
Ace 2: up to 5 days
Inspire: up to 5 days
Inspire HR: up to 5 days
Inspire 2: up to 10 days
Charge 4: Up to 7 days (up to five hours using GPS)
Versa Lite: 5 days +
Versa 2: 6 days +
Versa 3: 6 days +
Sense: 6 days +
Ionic: Up to 5 days (will reduce depending on the use of GPS)
Read our tips on how to get longer Fitbit battery life.
Which Fitbits are water-resistant?
All the Fitbit trackers are officially sanctioned as waterproof (down to 50M), and all but the Ace 2, Inspire and Versa Lite have basic swimming tracking features (number of lengths, distance swam). Experts recommend that you don't wear it while bathing, snorkelling or scuba diving, and Fitbit calls them water-resistant rather than properly waterproof. (Note that accessory straps on the Versa and Ionic might not all be waterproof.) Don't wear in a sauna!
Do all Fitbits use the same app?
Yes. They are all compatible with the same iPhone and Android apps.
The app displays all your daily and historical stats in beautiful graphs that expand in landscape orientation as well as display in portrait view. It's here that Fitbit really beats its activity-tracking rivals.
The desktop dashboard is another visually attractive and informative place to monitor your activity and fitness statistics.
And as an incentive, you can link with friends, family and colleagues to compete against each other on the leaderboard, get involved in daily or weekly Challenges and Adventures, and win badges determined by passing goals, and historical milestones. These aspects of the Fitbit system really set it apart from the other trackers.
Read our how we test wearables feature for more details.