Best fitness trackers 2024: Which? Best Buys and expert advice

When shopping for a fitness or activity tracker, should you buy Fitbit, Garmin, Huawei or Samsung? Our guide can help
Amy AxworthySenior researcher & writer
Fitbit surge tracking run 423587

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. Our guide can help you settle on the right model, so you can track your fitness and activity with a device you can trust. 

Best fitness trackers for 2024

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

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    • best buy
    • great value
    • Fitness tracking
    • Battery life
    • Comfort
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    • best buy
    • Fitness tracking
    • Battery life
    • Comfort
    Test score
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    • best buy
    • Fitness tracking
    • Battery life
    • Comfort
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    • best buy
    • Fitness tracking
    • Battery life
    • Comfort
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To see all the models we've tested, head to our full set of fitness tracker reviews.

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, but didn't respond when we approached it again to confirm. 
  • 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, Realme and Xiaomi.

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.

Video: how to buy the best fitness tracker

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 £70 for a good one, though we have tested some between £35 and £70 that impressed us. And we do currently have one that's frequently available around the £40 mark that we're happy to call Great Value. Great Value fitness trackers combine good performance with a cheaper than average price. Discover our Best Buy fitness trackers and Great Value fitness trackers

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.

Water resistance

Typically, if your fitness or activity tracker is rated for water resistance, there will be a list of letters and numbers to reference how well protected it is against water. For example, an IP68 rating means that the device can be immersed in water at a depth of a metre or more for a set period of time. 

The first digit after the IP reflects the level of protection against solids, such as dust or grit. The second represents the protection against moisture. An IP code with an X in place of either number means the device hasn't been tested for that element. For example, a fitness tracker with a rating of IPX7 has been tested for moisture protection, but not dust.  

IP codeLevel of protection
0No protection
1 - 3Protection against light rain
4 - 6Splashproof
7Protected from immersion in water with a depth of up to 1 metre for up to 30 minutes
8Protected from continuous immersion in water with a depth of more than 1 metre

The second is the water-pressure rating. These are standards set by the International Organisation for Standardisation (ISO). Pressure tests are measured in atmospheres (ATMs), and replicate the level of pressure at certain depths of water.

Water ratingsLevel of protection
1 ATMResistant to pressure equivalent to a depth of 10 metres. Splashproof, but not shower- or swim-proof.
3 ATMResistant to pressure equivalent to a depth of 30 metres. Splashproof and showerproof, and should be fine if accidentally submersed. Not designed for swimming.
5 ATMResistant to pressure equivalent to a depth of 50 metres. Splashproof, showerproof, can be worn swimming and snorkelling in shallow water.
10 ATMResistant to pressure equivalent to a depth of 100 metres. Splashproof, showerproof, good for swimming and snorkelling. Not designed for deep-water diving or watersports.
20 ATMResistant to pressure equivalent to a depth of 200 metres. Splashproof, showerproof, good for swimming and snorkelling. Good for surface diving and watersports, but not deep-water diving.


See our reviews of the best swimming goggles.

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, look for a smartwatch (rather than a fitness tracker, generally speaking) that has built-in storage for your tunes. You'll need a Bluetooth headset as well, though. Music management is not 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. 

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 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.

How long do fitness tracker batteries last?

Using your wearable could become irritating if you find yourself needing to charge it frequently. Generally, activity trackers have the advantage over smartwatches here – they're simpler devices with smaller screens, so won't drain as fast. 

Most activity trackers have a battery life that ranges from a couple of days to a couple of weeks. Some models use coin-cell batteries, like a watch, which last several months before needing replacing.

Smartwatches, on the other hand, may need charging every day after heavy use.

All the wearables we test are measured for battery life in our labs. Browse all our fitness tracker reviews to find the perfect combination of features and battery life. 

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.