Want an activity tracker but can’t decide whether to buy a Fitbit wristband or fork out for the rather lovely Apple Watch, now at Series 6? We pit Apple Watch vs Fitbit to see which comes out best on various aspects: fitness tracking, heart-rate monitoring, design, price, apps, battery life, and so on.
Apple is known for its smartwatches, and Fitbit for its activity trackers. But the boundaries and functions are getting blurred with Fitbit adding apps and lovely touchscreens to its trackers, and Apple adding more health features to its Watch.
Aside from the Sense and Versa family, Fitbits don’t run multiple apps like a smartwatch, but they are directly comparable on many of their fitness-measuring functions, design themes and functions. And most feature on-wrist notifications such as Caller ID and Texts - which, to be fair, are the most used non-fitness apps on most smartwatches anyway.
As a direct comparison, we’ll look at the Apple Watch (including the Series 3, and new Watch SE, and new Series 6 vs the Fitbit Charge 4, Fitbit Versa 2, Versa 3 and Fitbit Sense. Read our Fitbit Charge 4 review, Fitbit Versa 3 review and Fitbit Sense review, plus Apple Watch 6 review and Apple Watch SE review.
Both Apple and Fitbit make excellent products, so it's a matter of deciding which features really matter to you. We will focus on health and fitness as a core requirement, but there is more to both brands than just these functions.
Keeping fit doesn’t mean you have to be a gym freak or marathon runner. Keeping active throughout the day offers real health benefits too, and both the Apple Watch and Fitbit activity trackers are superb at getting you moving more.
The Apple Watch and Fitbit activity trackers measure steps taken, distance travelled and calories burned. They also show you how many minutes you’ve been active during the day. Each tracks your progress over time and can store historical data, and you set daily goals for yourself.
In addition, the Fitbit smartwatches (excluding the Versa Lite Edition) have a barometric altimeter that counts distance climbed (take the hilly route home, not the flat one). The Fitbits also sync weight data from optional Fitbit Aria scales.
As a result, the Fitbit models range from everyday fitness and active fitness (just like the Apple Watch) and further to sports and performance fitness - with the Charge 4, Sense and Versa 3 supporting running, cross-training, biking, strength and cardio workouts.
Serious runners dismissed the original Apple Watch and Fitbit for their needs, preferring the Ionic or other dedicated running watches from the Garmin or Suunto. But that changed with the release of the Series 2 Apple Watch, which featured a built-in GPS just like the Fitbit Charge 4, Versa 3 and Sense (plus older Versa 2 and Ionic).
The Series 3 Watch and Series 6 Watch have faster processors (the 6's processor is much faster so loads apps quicker) and but still weak battery life. A version with built-in 4G is also available so it can work without having to take your iPhone with you when you exercise.
This makes it a closer match to the Fitbit Sense and Versa 3, which (with similar built-in GPS, onboard music, notifications and contactless payments) can take care of most of your exercise needs without requiring you carry a phone or wallet around.
Fitness is obviously at the core of the Fitbits, whereas the Apple Watch counts activity tracking among its many features.
The Apple Watch offers two main fitness apps: Activity, which is all about health, movement, wellness and your daily routine; and Workout App, which tracks running, cycling and walking. All this data is collected on your iPhone via the Activity app, although you can get a more holistic view of their health by using the Health app on your iPhone, which integrates data from multiple sources, not only the Watch.
Apple uses movement and calorie burn rather than steps, which is Fitbit's primary metric - although Fitbit also measures calories and other metrics. Apple sticks to movement rather than calories for users aged 13 and under.
In watchOS 7, new workouts will include Core Training, Dance (tested with Bollywood, cardio dance, hip-hop, and Latin), Functional Strength Training, and Cooldown.
Read here for some great tips and advice on how to use the Apple Watch Activity app.
While they work brilliantly with the iPhone, Fitbits do not officially support Apple’s Health Kit, although integration is offered by third-party apps.
You can see at a glance how far you are with your daily movement and health goals by looking at the Apple Watch’s colourful three rings, which light up to show your progress. The Move ring shows calories burned. The Exercise ring displays how many minutes of brisk activity you’ve achieved. And the Stand ring shows how often you’ve stood up to stop sitting down. The aim is to complete each ring every day. It’s a great motivation tool.
Apple defines exercise as any activity that’s equivalent to at least a brisk walk. The Watch looks at your heart rate and movement data, so just going for a walk might not move that green ring as much as you’d think. It wants you to get your heart pumping a bit faster. The Apple Watch learns your habits so will push you harder the more active you get over time.
We love the Apple Watch’s ping to remind you if you’ve been sitting around too long – time to stretch the legs and get the heart rate up for a bit, or at least stand up. Basically, it’s a get-off-your-arse alert, from the haptic pulses to your wrist to notifications, that you’ve been idle for a long period of time. You can actually get an alert even when standing up because what the Watch is actually measuring is your lack of moving about.
Fitbit's Reminders To Move works in the same way, and is found on all Fitbits.
The Apple Workout app gives you real-time stats for exercise time, distance walked/run, calories burned and pace, and with the update to watchOS 4, it got a whole lot better. It's easier to use, but importantly now works with 80 percent of gym equipment so you'll get the data from the running machine or bike you use at your local.
Setting goals: Fitbit wins
One big difference here is that Apple doesn't let you set yourself goals for steps or other metrics, except for calorie burn. If burning calories is not your prime objective, then this is a definite limitation of the Watch.
In comparison, Fitbit allows you to set yourself specific goals for Steps, Distance, Calories Burned, Active Zone Minutes, Floors Climbed and your Hourly Activity Goal.
Heart-rate monitor: narrow Fitbit win
The Apple Watch and heart-rate-checking Fitbits use something called photoplethysmography to measure your heart rate. This uses green LEDs on the underside of the wristband to detect blood volume and capillary-size changes under pressure. When your heart beats, your capillaries expand and contract based on blood volume changes. The LED lights reflect onto the skin to detect blood volume changes.
Blood is red because it reflects red light and absorbs green light. When your heart beats, the blood flow in your wrist – and the green light absorption – is greater.
The Fitbits monitor your heart rate continuously, 24/7. They can store heart rate data at 1-second intervals during exercise tracking and at 5-second intervals all other times.
On the other hand (or should I say wrist?) the Apple Watch checks your heart rate only every ten minutes during the day. However, it does record your heart rate continuously when the Workout app is turned on, so you get constant feedback during training sessions. The Watch’s built-in heart-rate monitor does support external heart-rate monitors too.
Apple has improved the Heart Rate app, which now measures your resting heart rate and your recovery heart rate, and can give you notifications if anything seems awry.
The Apple Watch Series 6 comes with watchOS 7 pre-installed. watchOS 7 features a raft of new features, including sleep tracking, new workouts, weekly listening summaries to show how long you’ve listened to high-decibel sounds, cycling directions, and sharable watch faces.
Fitbit says that the Sense and Versa 3 have also improved heart-rate measurement, as the LED sensors have closer contact with the wrist.
The Apple Watch has the ability to detect and warn of a prolonged elevated heart rate when not exercising, and is able to spot low rates too (which could be a sign of bradycardia, when the heart is not pumping enough oxygen-rich blood around the body). It also looks out for irregular heart rhythms, notifying you of potential atrial fibrillation.
Patients visiting doctors often complain of heart problems that aren't happening right then, so having detailed and long-term heart data on file in the Health app is potentially beneficial.
Let's look at these heart sensors and how they can detect illness in more detail below.
Checking heart irregularities: Draw
Measuring heart rate also allows for the devices to check when the heart’s rhythm is irregular - which can be a sign of atrial fibrillation (AFib), a leading cause of stroke.
Both Apple and Fitbit include the ability to measure a person's electrocardiogram (ECG) signal.
The Fitbit Sense and Apple Watch include ECG tests. For example, by placing a finger on the Digital Crown of the Watch you can get it to run an electrocardiogram (ECG) test on you.
Each ECG app is CE marked and cleared in the European Economic Area and FDA-approved in the US.
Checking blood oxygen (SpO2) levels: Apple win
The balance of blood-oxygen saturation is vital to health.
Low blood oxygen levels could indicate a condition called Hypoxemia. Most people don’t have the chronic health conditions (asthma, heart disease, and chronic obstructive pulmonary disease) that require them to monitor their blood oxygen level, but if you do, then having an SpO2 sensor will be very helpful.
A normal SpO2 reading is typically between 95 and 100 percent.
Both the Apple Watch and the latest Fitbit smartwatches offer SPO2 sensors to detect blood-oxygen saturation. Both allow on-demand readings of your blood oxygen, but Apple's solution is more flexible.
The new Apple Watch can take a blood O2 reading in just 15 seconds at any time of day, while Fitbit only measures your blood-oxygen levels while you sleep, and you have to remember to switch the clock face for it to take a reading unless you subscribe to Fitbit's Premium service.
Fitbit users require a Premium subscription to then track trends over time in the Health Metrics dashboard within the Fitbit app.
Calorie counting: draw
The basic formula for losing weight is to count calories in and ensure you are expending more calories out through exercise. Both the Watch and Fitbits help you count these calories.
The Apple Watch uses motion and heart rate data to determine calorie count, which then dictates the Move metric of the Activity app. As you continue to wear your Apple Watch it will better learn your habits, average heart rate ranges, and normal activity levels, helping to make calorie counts more accurate.
Unlike Fitbit, Apple splits apart "resting calories" (calories you burn just by existing) and "active calories" (burnt through more vigorous activity). The Move ring is interested in Active, not Resting calories, which is a little more rigorous than Fitbit’s approach. Fitbit allows for "resting calories" too.
Your Resting Metabolic Rate (RMR) is the amount of calories that your body burns while you are at complete rest (with muscles relaxed, such as asleep) to keep itself alive (sustain vital organs such as your heart, brain, nervous system, lungs, kidneys, liver, muscles, and skin) and digest food. (Technical bit: Resting Metabolic Rate is not the same as Basal Metabolic Rate (BMR), which excludes the calories burned digesting food.)
If you set your calorie-burn target high on the Apple Watch you'll need to walk the equivalent of 20,000 Fitbit steps.
However, some Apple Watch owners have complained about calorie-counting inaccuracies, which might be down to the Watch's occasional inability to accurately record distance (and the fact it doesn't detect exercise automatically: you have to tell it you're cycling, running etc). The Versa and Ionic recognise when you’re running and automatically enter Run Mode - starting the GPS or connected GPS - and even automatically pause when you do.
Fitbit estimates the number of calories burned based on your BMR (Basal Metabolic Rate), calculated using your height, weight, age, and gender. The trackers that measure heart rate go into more detail, with the calorie burn estimate taking heart rate into account.
Fitbit calorie tracking begins at midnight and incorporates the calories burnt while sleeping – which is obviously missed by the Apple Watch that has to charge overnight. When you sync your tracker, Fitbit replaces the estimated calorie burn with your tracker's data.
You can also manually log fitness activities, so the calories burned during those activities are also taken into account. When you log your meals each day you can set a Fitbit Food Plan that estimates your daily calorie consumption, and records the number of calories you have burned and eaten so far in the day.
Sleep monitoring: easy Fitbit win
Scientists are increasingly linking weight gain and poor metabolism to sleep deprivation, so getting a good night's sleep should be part of your health, fitness and weight-loss strategy. Sleep loss can lead to an increased prevalence of diabetes and obesity. We should all be aiming for 8 hours of sleep per day.
8 hours is a worthy aim, but unrealistic for many (such as parents!). Between 6 and 7.5 hours is maybe a goal you'll hit more often.
Because its battery life is limited (see below), Apple recommends the Watch be charged every night. The Apple Watch's battery life is much improved, however, so can (on light, non-GPS use) last nearly three full days and two nights.
But that is not as impressive as Fitbit battery life that can last a week or more between charges.
With watchOS 7 Apple adds a Sleep app to the Series 3, 6 and entry-level SE Watches. It helps you establish a regular bedtime routine and keep track of your sleep trends night after night.
Apple Sleep uses motion sensors, heartbeat sensors, and microphones to detect micro-movements to track of how deeply users are sleeping. Watch will sync with the iPhone or iPad to show visualisations of the periods of wake and sleep, plus a chart showing weekly sleep trends.
Comparing Apple's Sleep app to Fitbit's is revealing, as my colleague David Price describes in his otherwise glowing Apple Watch 6 review. Despite loving the latest Apple Watch, he still replaces it with a Fitbit at bedtime!
He writes: "Sleep tracking is the biggest disappointment with the Apple Watch. Its data is so facile compared to that of a decent-quality Fitbit that it barely seems worth the effort".
If you use Fitbit Inspire 2, Versa 3, Charge 4 or Sense to track your sleep, you can see a record of the Sleep Stages you cycle through at night. While you’re asleep each night, your body typically goes through several sleep cycles: Light Sleep, Deep Sleep, and REM sleep that’s associated with dreaming.
Fitbit also goes into much greater detail on the different Sleep Stages you go through, and now offers a nightly Sleep Score on the quality of your sleep.
Sleep stages are traditionally measured in a lab using an electroencephalogram to detect brain activity along with other systems to monitor eye and muscle activity. Fitbit’s trackers can’t match this level of medical accuracy but can estimate your sleep stages every night.
Fitbit estimates sleep stages using a combination of movement and heart-rate patterns. While you’re sleeping, your device tracks the beat-to-beat changes in your heart rate, known as heart rate variability (HRV), which fluctuate as you transition between light sleep, deep sleep, and REM sleep stages.
Apps: Fitbit wins on fitness, Apple on everything else
Apple’s Activity and Workout apps look glorious, of course, but Fitbit’s appealing multi-phone app features more stats and data graphics. Fitbit also wins by having a rich desktop dashboard to collect and organise your activity data.
The Versa 3 and Sense work with the Fitbit Coach and Premium, which combine dynamic video workouts with Audio Coaching sessions to help users increase endurance, speed and form. With pricing of £7.99 or $9.99 a month, Fitbit says its Premium service will grow to include advanced tools with a library of programs and workouts to deliver personalised adaptive health and fitness coaching.
Apple is soon to release Fitness+ with workouts and trainers for £9.99 or $9.99 a month.
The Versa 3 and Sense might measure up better against the Apple Watch when they have a much-expanded range of non-fitness apps. Right now its apps are very limited outside of Fitbit's impressive health and fitness functions, plus notification features - but more are being released, and there are over 500 to download. If you want a large range of non-health apps then the Watch or an Android equivalent will suit you better than a Fitbit, although they do feature Caller ID, text message and calendar alerts on screen.
Wearing both Watch and Versa 3 and Sense we found that the most used Apple Watch apps were Notifications, which are ably handled by the Fitbit smartwatches too - and in a less graphic way by the less smart Fitbit trackers too. If the Apple Watch has a "killer app" it's probably Activity - so the Fitbits compete very favourably for the most-used daily apps despite offering fewer third-party apps.
Other Apple apps include Calendar, Camera Remote, Weather and Apple Maps. And there's a huge range of downloadable apps for the Apple Watch.
With the Watch, you can also create an album of photos stored on your watch and share these with people. You can also create a Watch face with one of your photos as the background.
The Fitbits are limited almost exclusively to fitness features. In addition, the Inspire 2, Charge 4, Versa 3 and Sense all feature Caller ID and Text notifications, buzz and show on screen who’s calling when your phone (iPhone, Android or Windows Phone) rings.
The Sense and Versa also have on-watch music controls (not the Versa Lite Edition), and 2.5GB of storage - enough for 300 songs, or your favourite podcasts and audiobooks. There's a Weather app also included on the Fitbit smartwatches, and Coach on-screen video workouts on the Versa 3 and Sense.
Design: Fitbit catching up
There are many different combinations of Apple Watch types, sizes and straps, from the simple Sport to the Watch Hermès Edition. Apple’s Jonathan Ive (now departed from Cupertino) scored another design success with the Watch, and it’s really rather beautiful. The choice of straps for the Watch is immense, and users praise their robustness - where older Fitbit bands used to fail more frequently.
Fitbit's tracker wristbands are a lot more minimal, with simple screens (see below) and stark straps, available in a range of several colours. You can wear Fitbits such as the Inspire 2 and Charge 4 with your regular wristwatch, but I wouldn’t wear an Apple Watch with a normal watch on the same arm - the same is true of the Versa and Sense Fitbits, though.
The Apple Watch is your main watch, not another wristband. The Fitbit Charge 4 or Inspire 2 can easily be worn as your only watch, too, of course, but can ride further up the wrist if you still love your regular timepiece.
Strap choice: The Fitbit Versa 2 (below), Versa 3 and Sense looks a lot like the Apple Watch, but has a smaller but still decent range of straps - with a choice of Black, Grey, Petal, Bordeaux and Emerald in Small and Large sizes. There are more luxury straps also available at extra cost: Stainless Steel links or Mesh, plus Leather (Lavender, Cognac Brown, Saddle Stitch tan, and Midnight Blue). The Special Edition Versa has a woven strap, plus silicon for swimming or profuse sweating.
If you want a watch to look like a watch, then the Apple Watch and Fitbit Versa 3 or Sense are for you. As a personal preference, we found the slimmer Fitbits to be the most comfortable of all the smartwatches we tested.
The Fitbit Inspire 2, and Charge 4 are also comfortable, and, in fact, mostly it’s difficult to tell you’ve got one on at all, as they are so lightweight.
Screen: draw but more faces from Apple
Apple Watch vs Fitbit specs and dimensions: The Fitbit Sense and Versa 3 are close in size to the smaller version of the Apple Watch. Both devices are equipped with a 1.58-inch display with a resolution of 336 x 336 pixels.
The dimensions of the Sense and Versa 3 pebble are 40.48mm.
All use an AMOLED display, which offers deeper blacks and sharper details than the original Versa.
Now the Versa 3 and Sense screen are as good as the Apple Watch's display, which brings the comparison closer still.
The Apple Watch has displays at 40mm and 44mm for both the Watch SE and Watch 6.
The new Apple Watch 6 comes in 40mm (324-x-394 pixels) and 44mm (368-x-448) sizes. The Series 6 - like the Series 5 before it - is slimmer than the Series 3, which means that despite the larger screens they have less volume than their predecessors.
The 38mm Apple Watch 3 has a 272-x-340 resolution. The 42mm Apple Watch 3 has a 312-x-390 resolution.
The Apple Watch’s touchscreen is a colourful beauty, while the Fitbits’ minimalism means displays are mainly white on black with some grey, although the Versa and Sense's colour screens are not as lush as Apple's, but do allow for more than the other Fitbits' minimal looks.
Because the screen is small, you might prefer using the Apple Watch’s Digital Crown to navigate as your finger will cover a big chunk of the display. Swiping works great, though, and this is available on the Charge 4, Versa 3 and Sense in Fitbit’s line-up. And the Watch’s Force Touch technology can detect soft and hard taps for different functions. It’s obviously the winner here.
You also get customisable watch faces with Apple, from digital and analogue chronometer and photo backgrounds to the new Siri watch face. You can also select watch faces on the Ionic, and even design your own.
The Watch fared very well in US Consumer Reports tests to see how scratch-proof its screen is. The Sport model was impervious to all but a masonry drill bit, and the Sapphire screen of the top Watch couldn't be scratched at all! With iPhone-like Gorilla Glass the Ionic's screen is also impressive.
If you want your wrist's screen to be always on, then only the Fitbit Versa 2, Versa 3, Sense and Series 6 Watch offer this option - handy during workouts or cycle rides when you might not want to lift your wrist to your face.
There’s certainly less choice or frivolity with Fitbit, which sticks to its simple digital display on all but the Sense and Versa 3, which can show alternative faces if you fancy it. But their less-flashy displays mean huge extra battery life for the Fitbits compared to the quickly tiring Apple Watch.
GPS: Apple wins on built-in
The Series 1 Apple Watch didn’t have built-in GPS - it paired with the iPhone in your pocket and uses its GPS instead. That was a problem for runners away from an indoor treadmill. Yes, you can carry your phone around with you on a run, but the Watch sells itself as a dedicated exercise device, and without GPS it’s not so for runners. That problem is solved with the Series 3 and 5, which have a GPS built-in.
Using a hiking app ViewRanger you can pick from nearby hikes, get notifications about scenic points while en-route, make sure you don’t go off the trail, and record your activity tracking, all using the Watch’s GPS.
The Apple Watch Nike+ is designed specifically for runners, with a lightweight aluminium body, a special active watch face, and a perforated Sports band for better ventilation. With this special Watch, you can ask Siri to start a run. While running, you can get a distraction-free display of the distance and your pace or an advanced mode with more details about your workout.
Running GPS eats battery life, and that’s something that the Watch doesn’t have oodles of. Serious runners are probably better advised to go for a dedicated runner's watch from the likes of Garmin, but the Series 3 Watch is now a proper contender.
The Fitbit Ionic, Versa 3, Sense and non-smartwatch Charge 4 also have GPS built-in.
The Fitbit Versa Lite, Versa 2 and Inspire 2 need to connect with your smartphone for GPS functionality, although they will work with iPhone, Android and Windows Phone compared to the Apple Watch's iOS-only compatibility. The Ionic does have a built-in GPS, and as mentioned earlier will automatically turn this on when it recognises you have started a run.
To get similar features with the other Fitbits you can use the MobileRun app, which gives you the ability to track runs, walks, and hikes using GPS. The MobileRun feature is available for all users of GPS-enabled devices running the Fitbit apps for iOS, Android, and Windows Phone.
The Apple Watch can also be tied to other iOS apps, such as MotionX GPS and RunKeeper, that use the iPhone's GPS. The Ionic comes with the popular Strava app, which lets you track your running and riding with GPS, join Challenges, share photos from your activities, and follow friends.
The Ionic's Multiple Sport Mode also lets you track your cycling (distance, location, average speed, heart rate and calories burned).
The Apple Watch’s Maps app, however, lends itself to long runs, especially in new locations. Both Watch and Ionic have weather apps so you can tell whether to put a coat on before you leave the house.
The Series 6 Apple Watch features a new Compass, with additional location data, such as heading, incline, latitude, longitude and current elevation.
Watch 6 and SE also offer International SOS, which works by pressing and holding the side button to call the emergency services.
Taking phone calls on your wrist: Apple wins easily
With the Apple Watch you can both make and receive voice calls on your wrist. You can even use Siri for hands-free dialling.
If someone calls you while you're wearing your Apple Watch (and it's within range of your iPhone, or a cellular model that can work independently of the phone), you'll be alerted by a subtle vibration as well as an audible ringtone if you haven't set the device to silent.
Look at your watch and you'll see who's calling, along with an answer or decline button. If it's someone you want to talk to, tap the green answer button. There are a built-in speaker and microphone, so you'll be able to chat without getting your iPhone out of your bag or pocket. If you don’t want everyone else to be able to hear your conversation you need to use a Bluetooth headset, or transfer the call from the Watch to your iPhone.
The only Fitbits with a microphone are the Versa 2, Versa 3 and Sense, which uses the mic to operate Amazon's Alexa and Google Assistant (usually a better voice assistant than Siri but Siri on Watch can give you directions or play you a song).
With both the top-end Fitbit Sense and Versa 3, you can now take hands-free Bluetooth calls with the on-device microphone and speakers, send incoming calls to voicemail, and control volume without reaching for a phone. Android users can also respond to text messages on-the-go with voice-to-text commands.
The Apple Watch has a microphone and a speaker, so you can talk to it and it can talk to you. You can also use the mic to do voice dictation, send audio messages, and chat to friends via the Phone app. It also boasts up to 32GB of storage so you can keep a bunch of your dearest photos on your wrist.
But, of course, the Apple Watch pairs only with Apple's iPhone, so Android users should consider Fitbit their friend, or look to other smartwatches from the likes of Samsung.
Battery life: Fitbit wins, no contest
The Apple Watch has so many potential uses (make calls, view photos, send and check messages, change music, check weather, activity tracking, digital payments, and, er, tell the time) that its battery runs down a lot faster than standard activity trackers.
Apple says you’ll get up to 18 hours of active and passive use: that’s 90 time-checks, 90 notifications, 45 minutes of nonstop app use, and a 30-minute workout with Bluetooth music playback from the watch. So you need to charge every night unless you use it only to tell the time in which case you might get three days out of it in Power Reserve Mode.
As mentioned earlier, Apple Watch has much-improved battery life, and with light use (Activity tracking, Time and Notifications just like on a Fitbit) can last nearly three full days - and crucially a couple of nights for sleep tracking. But Apple acknowledges the weaker battery life by not having sleep tracking as a built-in app.
The Apple Watch is smart about saving what battery life it has. The watch face always turns off every 15 to 20 seconds. When you put your arm down the screen goes black. When you raise your wrist, the screen returns.
You can also put it into “Power Save Mode” in the Workout app on your phone to turn off heart-rate tracking completely during runs – although that’s not great for learning more about your run. Serious runners want detail before, during and after the run, and don’t want to carry their iPhone and their Watch with them.
Fitbits last a lot longer between charges, at around five days. The Charge 4 can run for up to a week. Fitbit re-charging time is around two hours, around the same as with the Watch. If you use the Fitbit's or Watch's GPS a lot then battery life will drop considerably. With GPS turned on the Fitbit will fade by 10 hours, and the Watch by five.
Anyone who’s a keen tracker user will know the fear when you are suddenly alerted to a fading battery. Every step must be counted. Overuse your Watch, and it might die during a workout or just moving around during the day.
Find out how to get longer Fitbit battery life.
Water resistance: draw
The Apple Watch is waterproof, "up to 50 metres" – although it's really not for deep water, as Apple explains: "This means that it may be used for shallow-water activities like swimming in a pool or ocean. However, Apple Watch should not be used for scuba diving, waterskiing or other activities involving high-velocity water or submersion below shallow depth. Stainless steel and leather straps are not water resistant."
The Fitbits are swim-proof and safe in the water at 5 ATM (50m). Fitbit also recommends taking its wristbands off before showering because, as with any wearable device, it’s best for your skin if the band stays dry and clean. See: Are Fitbits waterproof? for more details.
The Apple Watch and Fitbit smartwatches offer swimming tracking features. Both the Watch and Fitbit Sense feature a gyroscope for more accurate swim measurements.
Rewards: Fitbit gets the medal
When they reach their personal bests or hit milestones, Apple Watch users get a special badge for each achievement, which is then stored in the Activity app on their iPhone.
Fitbit also dishes out badges for achievements, tying them to comparative distances, so you’ll get a Sahara badge when you’ve walked the equivalent distance (not all in one day!).
A real motivational plus with Fitbit (and many other activity trackers) is the ability to compete against friends. This is a fun way to push yourself that bit further: walk that escalator, leave the lift and take the stairs.
Apple Watch owners can share their Activity circles with your friends to keep each other motivated, but this is not as easy as with Fitbit, and you're less likely to have a bunch of Watch-owning acquaintances unless you spend a lot of time hanging out at an Apple Store!
With Apple, you can invite friends to compete in a seven-day competition where you both earn points by filling your Activity rings.
Apple offers achievement badges for the first time you perform new exercises, workout records, 7-workout weeks, and move goals and streaks. There are monthly challenges, too.
But there’s not as many adventures and challenges as on offer from Fitbit.
Comparing all the models: Apple Watch vs Fitbit
While it's a great entry-level fitness tracker, the Fitbit Inspire 2 is maybe too basic to be compared with the Apple Watch.
The Fitbit Charge 4 is not a smartwatch. Its apps are basic and it has a monochrome touchscreen. But other than that, it’s an activity tracker that offers a lot of fitness and smart features, including built-in GPS, heart-rate monitor, automatic workout detection, altimeter, smartphone notifications, contactless payments, and even limited Spotify controls. Prices start at: £129 / US $149
The Fitbit Versa 3 has everything the Charge 4 has, but in a smartwatch with great colour touchscreen that allows for brighter graphics and onscreen workouts, plus an always-on display option. It has a microphone and speaker, and has Alexa and Google Assistant voice tools, music storage and control, and more smartwatch apps. Prices start at: £199 / US $229
Building on everything on the Versa 3, the Fitbit Sense adds a bunch of sensors that are built around health as well as fitness. It has stress-management tools based on sensors that measure an Electrodermal Activity (EDA) and Skin Temperature. There’s SP02 monitoring for blood oxygen and electrocardiogram (ECG) to check your heart's rhythm with high and low heart-rate notifications. Prices start at: £299 / US $329
While the Apple Watch Series 3 is an older version (from 2017), it is still a great smartwatch with fitness and health features at a low price point. Its display is 30% smaller than and not as bright as the other two Apple Watch versions, with a little-lower resolution. It gives high and low heart-rate notifications and can check on irregular heart rhythms. It has built-in GPS, optical heart sensor, gyroscope, altimeter, speaker and microphone (for Siri and also phone calls from your wrist). Apple Pay is also included. Prices start at: £199 / US $199
The Apple Watch SE is a new model, based on the Apple Watch Series 6, but missing some of the top-end Watch’s features. That said, it has the same great screen but not an always-on display function. It has a built-in compass, always-on altimeter, and fall detection on top of everything the Watch 3 has. Prices start at: £269 / US$279
The Apple Watch Series 6 builds on the SE’s great feature set, with the always-on display option, blood oxygen and ECG app. While the 3 and SE have aluminium cases, the 6 has options in stainless steel and titanium, too, with more colour and band options. Prices start at: £379 / US$399
Price: Apple getting cheaper
Of course, price is important when choosing between Fitbit and Apple Watch.
No one ever accused Apple of selling cheap products. Its ability to make the industry’s most expensive products into bestsellers is the reason that it’s one of the richest companies on the planet. And the Apple Watch, while in no way the most expensive watch in the world, is the priciest smartwatch.
But Apple has now cut the entry-level Apple Watch price down to Fitbit smartwatch levels of affordability. Fitbit still has much cheaper options for trackers that aren't smartwatches, though.
The Apple Watch SE is a mid-range Apple Watch, sat between the Apple Watch Series 3 and flagship Apple Watch Series 6, priced at £269 / US$279 for the 40mm variant and £299 / US$309 for the 44mm variant, with the cellular model costing £50 / US$50 more.
Series 3 Apple Watches start at £199 / US $199 / AU $319 - the same as the Fitbit Versa 2, but not the cheaper Versa Lite.
Series 6 Apple Watches starts at £379 / US$399 for the aluminium version, with the steel variant costing more, and the cellular model of each also costs more (£479 / US$499 for the aluminium body). Prices go up to £1,449 or $1,499 for the posh Hermes version.
Fitbit wristbands start at £89 / US $99 / AU $129 for the Inspire 2. The Fitbit Charge 4 is priced at £129 / US $149 / AU $249, the Versa 3 at £199 / US $229 / AU $399, and the Sense at £299 / US $329 / AU $499.
Previously, even the most expensive Fitbit was around the same price as the cheapest Apple Watch - but the new low price for the Watch SE makes them the same as Fitbit's Versa 3. Note that you can often pick up a Fitbit cheaper online from stores such as Amazon, while Apple rarely offers discounts.
See our updated roundup of the best Fitbit deals.
Of course, you get a whole lot more functionality for your money with the Apple Watch, but if it’s activity tracking you’re after then you save a bunch going for a Fitbit.
Compatibility: Apple is iPhone only
Fitbit is compatible with iOS and Android. You don’t have to have a smartphone for Fitbit to work, as you can sync with the excellent desktop Fitbit Dashboard, but it’s good to have more syncing opportunities and be able to see some fancy stats and graphs on the go.
While only the Versa 3 and Sense smartwatches can run apps themselves, a Fitbit wristband can be integrated with apps such as MapMyRun, MyFitnessPal, Runkeeper, Endomondo, Strava and more.
For obvious reasons Apple Watch is compatible with iOS devices only, so the iPhone is the only smartphone that will work with it, and you really need one for it to make sense.
Apple Watch can run other fitness apps, such as Nike+Run Club, Runtastic Pro, Pocket Yoga, Map My Run, Endomondo, and Cyclemeter GPS. New apps will be released in the future so the Watch should get better functionality as developers work out new features.
Hearing: Apple wins helping your ears
Apple introduced a Noise app in watchOS 6 that measures ambient sound levels and duration of exposure. watchOS 7 adds further aids to hearing health with headphone audio notifications.
This will show how loudly you are listening to sound through your headphones when using an iPhone, iPod touch or Apple Watch, and how these levels may impact hearing over time.
Apple will tell you when your listening has reached 100% of the safe weekly listening amount as determined by the World Health Organization.
The Health app can even control the maximum level for headphone volume.
Which should you buy: Fitbit or Apple Watch?
If fitness is your primary focus then we think the Fitbit trackers come out on top (especially if you’re into multi-sports), but the Apple Watch, of course, offers a lot more than just activity tracking and heart-rate monitoring.
The expanding Apple Watch app ecosystem will make the Watch a much more versatile wearable than a dedicated fitness band. And the new Series 6 Apple Watch with built-in GPS and 4G is a major advance in Apple creating a proper activity tracker, despite its improved but comparatively poor battery life.
But that comes at a pretty steep price.
The Fitbits offer much better battery life (the Charge 4 lasts up to a week!), and so don't have to be charged every night while you sleep.
Detailed sleep monitoring can be nearly as enlightening to the state of one’s health as one’s daytime exercise routine. While Apple has added a Sleep app, its weaker battery life makes this troublesome for users. Sleep tracking on the Fitbit is much easier, although Fitbit does hide some of the metrics back for its Premium subscribers.
And we love the motivation offered by Fitbit’s Friends league.
Crucially, if you have an Android, the Apple Watch is simply not for you. Without an iPhone, it’s pretty useless.
Apple Watch users don’t need to get a Fitbit as well as their prized digital timepiece, but runners and the fitness nuts should consider adding some third-party apps or a dedicated sports watch from Garmin, Suunto or Polar, or try out the Ionic.
Of course, one big advantage of the Apple Watch is its ability to make and receive phone calls, which none of the Fitbits can match.
So for fitness and activity tracking we vote for the Fitbits, but applaud Apple for the Watch’s fitness apps that should push Watch owners to get up and move about more – something all of us gadget owners could do with to stop us sliding into unhealthy lifestyles.
Check out our Which Fitbit is Best roundup here.
Thanks to Marilisa Cannavo, a one-time Fitbit fanatic who was gifted an Apple Watch, and so offered us a real user's comparison. She misses Fitbit's friends and family leaderboard (which she always won) and other Fitbit challenges and awards, plus the ability to set her own goals rather than stick with Apple's defaults. She does love the Watch design and its ability to make and receive calls on her wrist.