Best fitness trackers 2025: tested and reviewed by experts

The right fitness tracker or activity tracker can provide you with an accurate, comprehensive and easy-to-understand view of your health, whether you’re running, cycling, swimming, monitoring your heart rate or trying to up your step count. 

But paying for features that you won't use, or that aren't designed for your type of exercise, is a common mistake. Plus, the worst trackers we've seen won't track your activity accurately and show you irrelevant data. Our guide can help you settle on the right model, so you can track your fitness and activity with a device you can trust.

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Go straight to our fitness tracker reviews to compare all the models we've tested, or check our guide to the best smart rings.

What is a fitness tracker?

A fitness tracker is a device you wear on your wrist that can track your steps, heart rate and exercise. It connects to an app on your smartphone, but you can control most of the essential functions on the tracker's small screen. The latest fitness trackers offer more advanced capabilities including sleep tracking and receiving notifications from your phone.

Fitness trackers used to be much more limited than feature-packed smartwatches, but the most premium fitness trackers are becoming more and more like their smart counterparts. This includes offering the ability to take calls and send messages directly on the device. Find out more about which might suit you best in should I buy a fitness tracker or a smartwatch?

Here’s a selection of the top-scoring fitness trackers from our lab tests.

Only logged-in Which? members can view our recommendations in the table below. If you're not yet a member, join Which? to get instant access to all our reviews.

Fitness tracker reviews by price

• Fitness trackers under £50
• Fitness trackers under £100
• Fitness trackers under £150

Fitness tracker reviews by brand

• Fitbit fitness trackers
• Garmin fitness trackers
• Honor fitness trackers
• Huawei fitness trackers
• Xiaomi fitness trackers

For more ways to keep fit around the home, check our guides to the best treadmills and best walking pads.

Why you can trust our fitness tracker reviews

We don't take accept any free samples. We buy every product we test to make sure we're getting the same quality you would. 

We know you want to get as much use out of your fitness tracker as possible so our tests are extensive. Fitness trackers claim to track a lot of metrics, the most common being heart rate, steps and distance. We'll test how well it does these, and if it claims to track your blood oxygen levels, we'll test the accuracy of this technology too.

Glossy marketing pictures won't tell you if a fitness tracker is comfortable to wear when exercising, resting or sleeping, but our tests will. Our experts will evaluate the quality of the tracker's screen and how useful the stats and graphs are that it shows you about your health. We'll also tell you how good the paired smartphone app is. Most fitness trackers connect to both Android and iOS (Apple) smartphones, so we check to see if there are any differences in your experience on the paired app depending on your phone.

Fitness trackers collect your personal health data, which must be kept secure to avoid it being used against you. Our privacy and security testing will check to see if there are any serious vulnerabilities that could be exploited. Read more about how we test fitness trackers.

Where to buy a fitness tracker

You can pick up a wide variety of models from tech retailers and online marketplaces. We've highlighted a few of the most searched-for retailers that have a range of fitness trackers to help you narrow it down:

• Amazon has the most varieties of fitness trackers available, including brands such as Xiaomi, Fitbit, Garmin, Huawei, and more. Prices start from under £35, but most will cost between £80 to £150. Prime members get free two-day shipping, or even next-day shipping on select models.
• Currys offers activity trackers from brands such as Fitbit, Garmin, and Huawei. You'll typically be spending between £40 and £150 for one. Delivery is free for most models, but if you want next-day shipping you'll need to pay between £6 and £10.
• Fitbit sells its fitness trackers direct. Fitness trackers start from around £50, and you can get them in different colours. You can also pick up a variety of different bands for your tracker, too. Delivery is free on most models.
• Garmin has many of its models available to buy directly. You'll get free shipping on orders over £30 and most fitness trackers start from £70.

How much do I need to pay for a good fitness tracker?

You can buy a tracker for as little as £2 or you could pay close to £250. 

Be wary about going too cheap – you could end up with a device that's fiddly and frustrating to use. You also run the risk of your data not being protected. We tested ultra-cheap fitness trackers and smartwatches (dead ringers for Apple, Fitbit and Samsung) and each one had concerning security flaws. Read more about our investigation into security issues in cheap smartwatches and fitness trackers.

Generally speaking, you'll need to pay at least £50 for a good one, though we have tested some one that's frequently available around the £35 mark that we're happy to call Great Value. Great Value fitness trackers combine good performance with a cheaper than average price. Read our fitness tracker reviews and use the Best Buy and Great Value filters to find the best options for your budget.

Find out all about weight-loss injections: how they work and how to buy them safely from our experts

Which fitness tracker is the most accurate?

You might take for granted that your shiny new fitness tracker or smartwatch does the job it claims to, but this isn't always the case.

We've found fitness trackers and smartwatches that over or understate data, or that are unreliable and inconsistent day to day, making hard for you to get an accurate picture of your progress. 

One of the worst products we've tested miscalculated step count by 66%, meaning you'd only have taken 3,400 steps when it tells you you've taken 10,000.

If you're using a smartwatch or fitness tracker to help you achieve a specific goal - say, reaching a daily step count target or running a certain distance - you'll want to ensure it's accurate. We put our wearables through a range of scenarios, including an outdoor run, to see just how accurate each one really is.

We check how accurate they are at measuring steps, distance and heart rate. And we take consistency into account as well. If a tracker is accurate on some days but not on others, you won’t know whether you’re improving. 

For more details, check in with our guide on how we test fitness trackers.

Which fitness trackers do not require a subscription?

Pretty much all of them. Fitness apps from Amazfit, Fitbit, Garmin, Huawei, and Xiaomi are all free to download for their wearables.

But some of the big brands offer extra features for those willing to pay a subscription. It's likely that you'll only find these useful if you want deeper insights about your fitness and sleep. A lot are available via free trials, allowing you to try them out before you continue with a monthly payment. Though it's important to note that some of the features will only be available on premium smartwatches rather than fitness trackers.

• Fitbit Premium (£7.99 per month) Fitbit Premium is probably the most popular subscription app in our list, available on Fitbit and Google fitness trackers and smartwatches. You'll benefit from a monthly wellness report, where the app collates all the data it's recorded on you and makes comments. This could be useful if you're looking for a report to discuss with your doctor. Other perks include blood glucose tracking (though you have to put this information in manually), extra skin temperature insights (for devices that can measure this), and a detailed look of your sleep habits over the past month. One of the most useful features is the Readiness Score, which uses your recent activity to assess if it thinks your body is ready to train again. You also get meditation exercises and access to healthy recipes.
• Garmin Subscription Plan (£5.99 per month) Instead of offering extra health tracking features, Garmin offers subscriptions to stay connected to others when you're doing activity outside. This can include sending 'check-in' messages to family and friends and emergency SOS alerts. Garmin devices often don't offer messaging as standard, so a subscription is the only way to get this ability directly on the device. You can also get a premium collection of mapping data with the Maps+ annual plan (£49.99 per year). There are a couple of other premium subscriptions for specific activities too, such as golf (see also: Best gifts for golfers).
• Huawei Health+ (£7.99 per month) Huawei's offering gives you personalised workout plans, the ability to track more metrics to do with your progress, and weekly reports of your activity. Other perks include breathing exercising and relaxing sleep music.
• Amazfit Zepp Aura Premium (£29.99 per year) Amazfit's subscription is only for enhanced sleep and stress tracking. It claims to give you more in-depth sleep reports and information about your breathing quality. An AI-fuelled personalised sleep coach will give you recommendations after it has analysed your data.

When we evaluate an app in our lab testing, we always test the free version so you know what you'll get without having to pay extra. The only wearable we've tested so far that won't work without a subscription is the Oura Ring 3. But with so many software updates being offered in fitness apps, we suspect it won't be the last.

Which fitness tracker brands offer the best software and security support policies? 

Security and software support is important to consider when buying a fitness tracker, dictating how long the brand continues updating the device with new features and security patches, to guard against emerging threats. 

We estimate the 'lifetime' of a fitness tracker – the average time we’d expect one to last before it breaks down or deteriorates significantly – is 4.3 years. This is based on robust analysis of recent product surveys and is a conservative estimate, so we’re confident that the genuine average is above this value.

We reached out to the biggest brands to find out more about support policies for wearables (smartwatches and fitness trackers). As you can see, many are falling well short of this measure.

• Samsung leads the line here, promising at least five years from launch on the Galaxy Watch4 smartwatch and later, and three or four years on previous models.
• Fitbit said its devices ‘typically receive’ software updates for at least two years after a device is last sold on its website.
• Garmin told us in 2022 that it will provide updates for a minimum of two years from launch on its consumer products.
• Honor will support these for a minimum of two years from launch. 

Other fitness tracker brands that did not provide us with information on minimum update support periods include Amazfit, Huawei and Realme.

While you might not be at immediate risk if you're using an unsupported device, it's obviously much better to choose one that you know will receive update support for a decent period of time. For more information, read our guide to smart devices and security.

Fitness tracker features to look out for

Some fitness or activity trackers pack in a wide range of sensors to track everything, from steps and heart rate to your exact location and even the intensity of sunlight, to let you know when it’s time to reach for the sunscreen. This can result in more detailed feedback but, as revealed by our tough tests, not every device is accurate.

On top of that, having too many sensors can reduce the battery life, or make the device more complicated to use (we rate ease of use in our tests too), so it's important to get the right balance. 

Step tracking

A pedometer is the most basic sensor and one you’ll find in any activity tracker. This will count your steps and can often capture distance, too, based on an estimation of your stride length. We put the step counter through its paces in our tough lab test and check the accuracy.

Built-in GPS

If your wearable has built-in GPS, it can track distance more accurately – as long as the GPS works well and doesn’t drop the connection. Many fitness trackers can be paired to your mobile phone to make use of its GPS; however, built-in GPS is useful if you want to jog or cycle without having to carry your phone.

Heart-rate monitoring

Most now come with a heart rate monitor which will report on your average heart rate, and periods of peaks and troughs – useful for tracking improvements in your fitness.

Again, accuracy is important, and this can vary a fair bit between different makes and models. We rate this as part of our lab tests, too, to find good trackers that don't miss a beat.

More accurate heart-rate monitoring should also mean more accurate VO2 max estimates (estimates of your maximum rate of oxygen consumption) if your tracker has that function. VO2 max data can be useful for climbers, people preparing for a particular event and athletes.

Sleep tracking

Most trackers, including cheap ones, will now keep an eye on your sleep, including motion sensing to see whether your sleep is disturbed, and offering you an estimate of how much of your sleep has been spent in REM, or light or deep sleep. Some have a sleep cycle alarm, meaning your tracker will wake you up at the optimal time in your sleep cycle that’s close to your desired wake-up time. If you're interested in this, we have a dedicated guide on how to track sleep with a smartwatch or fitness tracker.

How waterproof are fitness trackers?

Most fitness trackers should be at least splashproof (ideally IP67 or IP68-certified for immersion in water). Note that this doesn't meant the watch is suitable for swimming; this capability is usually measured in atmospheres (ATM). For example, 5 ATM means a tracker should be water-resistant up to a depth of 50 metres.

There's a range of ratings which show how splashproof a watch is or if you can swim with it. 

• If you want to swim in shallow water, look for a rating of IP7/5 ATM or above. This should be fine for casual use but you'd want to avoid the watch being impacted directly by swift currents during water sports.
• If you're looking for a watch you can take deeper, you'll need a rating of IP8/10 ATM.

Some fitness trackers shouldn't be used in the water at all. Others can be if you've got the right sort of strap, usually silicone. You should also avoid using a watch in hot showers or saunas, and bear in mind that the level of water resistance is not permanent and may reduce over time.

Some models don't give you much in the way of swim-tracking data, while others will tell you the number of lengths, your pace, stroke rate and swimming efficiency. A few can be paired with a heart-rate monitor chest strap. 

Third-party apps

If you already use an app on your smartphone or wearable, such as Strava or running app MapMyRun, you won’t want to lose access to your data or the in-depth analysis a dedicated app can offer. Smartwatches are more likely to offer compatibility here, allowing you to pair with app services and sync the data from your wearable. 

Music

If you want to listen to music on your run without taking multiple devices out with you, it's more likely you'll find this capability on a smartwatch (rather than a fitness tracker) that has built-in storage for your tunes. You'll need a Bluetooth headset as well, though. Music management is not always a feature that's commonly found on activity trackers, so head over to our smartwatch reviews to browse all the models we've tested.

Fitness trackers are a great way of recording progress in a home gym, as well as outside. Read our exercise equipment buying guide for more on setting one up. 

How we test fitness trackers

Our tests go the extra mile, using specialist lab equipment to check the accuracy of the tracking capabilities of each device. Our panel of users gets to grips with the trackers over a number of weeks, so that we can also tell you how easy to use and comfortable to wear each device is. 

Read more about how we test fitness trackers.