Fitbit Cost four assessment

Fitbit’s prime exercise tracker, the Cost four boasts a bunch of recent options and features that rival even Fitbit’s pricier health smartwatches. Our Fitbit Cost four assessment will look into all these health and health-related options, present how they work within the app, and evaluate it with different trackers.

The Cost four matches the exercise tracker with the highest smartwatches. In some methods, the primary distinction is the monochrome touchscreen.

The Cost four has every thing the Cost Three had and makes the tracker even higher. Even house owners of the superb Fitbit Versa 2 smartwatch will look enviously at a number of the new options Fitbit’s tracker brings to the desk.

The Cost four debuted Energetic Zone Minutes (AZM), a personalised health problem that counts all actions that push your coronary heart price up – be that working, weights, biking or dancing. The more durable you push your self (into Cardio and Peak zones), the extra credit score Fitbit offers you. This has now been rolled out to the Sense and Versa collection smartwatches, and the entry-level Encourage 2 tracker.

On prime of AZM, the Cost four comes with built-in GPS and Spotify Join & Management – each not accessible on the older Cost Three. It is the most cost effective Fitbit with built-in GPS too.

• Finest Fitbit 

The Fitbit Cost four is primarily a health tracker, however comes with different health-focused options and helpful on-screen notifications, resembling texts and caller ID.

On this Fitbit Cost four assessment, we’ll take a look at all of the options (health, wellbeing, notifications, apps, and so on), and evaluate it to the opposite Fitbits, particularly the earlier Cost Three and the current Encourage 2.

February 2021 replace: The Cost four now has entry to expanded blood oxygen information (SpO2) measurements and pores and skin temperature monitoring. And customers can see seven-day traits for Respiratory Fee, Coronary heart Fee Variability, and Resting Coronary heart Fee within the app’s Well being Metrics dashboard – beforehand accessible solely to Premium subscribers (who do get to see 30-day traits, as nicely).

Fitbit Cost four is stuffed with options

Beginning with the fundamentals, the Cost four tracks steps, distance, energy burned, hourly exercise, flooring climbed, coronary heart price, swim-tracking, and sleep.

Packed into the small tracker are a Three-axis accelerometer, optical coronary heart price monitor, GPS, vibration motor, NFC chip (for Fitbit Pay), altimeter, and Bluetooth LE (BLE).

Coronary heart-rate monitoring is nice for monitoring calorie burn and getting real-time steering to optimise your exercises. It’s also used for superior sleep monitoring.

As well as, the Cost four options most of Fitbit’s extra superior features, together with Cardio Health Degree (by way of three totally different heart-rate zones), guided respiratory, transfer remindersauto-exercise recognition, assist for train modes resembling run, bike, swim, treadmill, weights, yoga, and circuit coaching; feminine health-tracking (monitor signs, log moods, evaluate cycles and extra); Sleep Rating, alarms, timers, calendar and climate apps; and might show notifications resembling caller ID, texts, calendar, WhatsApp, and extra.

Ultimately! GPS built-in

New to the Cost four (and a primary on Fitbit’s non-smartwatch trackers) is built-in GPS.

Having GPS constructed right into a tracker delivers deeper health and well being evaluation to enhance your runs and cycle exercises, resembling tempo, relaxation occasions, velocity and extra.

Most Fitbit tracker wristbands let you hook up with your cellphone’s GPS, however this fashion doesn’t at all times clock the proper distance travelled, because it calculates stride size to estimate this.

Now you are capable of log correct real-time tempo and distance whenever you go working, using or mountain climbing, whereas leaving your cellphone at residence.

There are six GPS-compatible train modes on the Cost four: Run, Bike, Stroll, Treadmill, Outside Exercise, and Hike. A hike is thought to be extra strenuous than a stroll, and burns extra energy.

Different GPS actions embrace downhill and cross-country snowboarding, kayaking and browsing.

A exercise depth map reveals your GPS-monitored route, distance, achieved heart-rate zones and tempo by kilometre or mile. You may faucet the map to see extra detailed stats about your exercise as nicely.

GPS is ready as “on” by default when you choose an train mode, however to avoid wasting battery life you may flip it off. Like most high-end Fitbits, the Cost four can use Run Detect and Auto Cease to work out that you’re going for a run, however received’t routinely hearth up the GPS.

Dynamic GPS is an non-compulsory new perform that may intelligently sense in case your cellphone is with you whenever you’re utilizing the GPS monitoring constructed into the Cost four. If it is close to, the Fitbit makes use of the cellphone’s GPS location to protect the tracker’s battery life. 

House owners of the Versa 2 will little question be jealous, as that smartwatch lacked built-in GPS. The newer Versa Three and Sense do sport built-in GPS, too.

Energetic Zone Minutes

Energetic Zone Minutes (AZM) was seen first on the Cost four. This metric is personalised based mostly in your resting coronary heart price and age. It tracks any exercise that raises your coronary heart price – from a brisk stroll to working, indoor biking and yoga. It measures the time you spend in every coronary heart price zone.

Fitbit measures three energetic heart-rate zones: beginning with Fats Burn, by way of Cardio to Peak.

Fitbit makes use of your “heart-rate reserve”, which is the distinction between your most coronary heart price and your resting coronary heart price. It’s a sign of your total cardiovascular health. Your resting coronary heart price could be lowered by growing your health degree.

You may set your personal purpose, however the default is a weekly purpose of 150 minutes (as advisable by the World Well being Group and the NHS).

AZM isn’t actually that new. Fitbit has measured Energetic Minutes for a very long time. Now, nonetheless, it has gamified the metric a bit and makes use of the heart-rate zones in a extra upfront method. You earn one credit score for every minute of average exercise within the Fats Burn zone and two for extra vigorous exercise in Cardio and Peak zones.

Every time you modify heart-rate zones the tracker offers you real-time alerts in your wrist, so you may push more durable (or cut back) to make your exercises extra environment friendly. You will get an in depth abstract of your motion by way of the center price zones within the Fitbit cell app.

It is loads like Garmin’s Depth Minutes function on its wearables.

Energetic Zone Minutes is now accessible on all Fitbit smartwatches, in addition to the Cost four and Encourage 2. We price it as a brand new motivating metric to set your targets round.

Carry on shifting

From the clock face, you swipe as much as see the Right now app, which reveals your day by day stats (customisable), together with Reminders To Transfer, which can immediate you to stand up out of your chair and begin shifting for at the least 250 steps per hour of the day.

Reminders to Transfer is an effective way to be sure to don’t keep sitting for too lengthy – and we spend over half our day sat down. It’s not nearly getting your steps up and burning a number of extra energy. Sedentary individuals have as much as a 49% higher danger of early demise. To take two examples, sedentary behaviour results in a 112% enhance in your danger of getting Kind 2 diabetes, and 147% enhance within the danger of coronary heart illness.

Sleep monitoring, Guided Respiratory and SpO2

Sleep is a key well being and wellbeing indicator, and the Cost four offers you a Sleep Rating based mostly on detailed Time Asleep, Deep and REM sleep levels, plus ‘Restoration’ – the time that your sleeping coronary heart price is beneath your common waking coronary heart price. Solely Fitbit Premium subscribers get to see Restoration information, which is a disgrace, however you may dwell with out it as you get to see your total Sleep Rating regardless.

The very first thing I do once I wake is to examine my Sleep high quality on the Fitbit app, and that is considered one of my favorite options. Getting a good night time’s sleep is as essential as hitting these 10,000 steps.

One annoyance is that my resting coronary heart price may be very low (54bpm), and so getting beneath this whereas asleep appears harder for me than somebody with a resting coronary heart price of 64-100bpm.

The tracker is mild and cozy to put on, and it received’t cease you from sleeping, except you set the silent alarm to vibrate, after all.

The tracker now options Sensible Wake, a Fitbit smartwatch function that buzzes you throughout mild sleep throughout the 30 minutes of your set alarm to wake you in a calmer means than a sudden alarm.

When not sleeping, you may nonetheless calm down by utilizing the calming Guided Respiratory Periods based mostly in your coronary heart price.

One other well being metric you’ll discover below the Sleep part of the app is Estimated Oxygen Variation, which makes use of an Sp02 sensor to graph an estimation of the oxygen-level variability in your bloodstream – which may present probably dangerous variations in your respiratory throughout sleep.

Cost four customers can now additionally see their blood oxygen studying on the wrist, following an replace in February 2021.

• Fitbit well being and health scores and stats defined

Apps and non-health features

One of many smartest non-fitness or health-related options is Notifications. The Cost four will gently buzz you whenever you get a name in your cellphone (and present caller ID), textual content messages and pushes from the likes of WhatsApp. Android customers may even ship Fast Replies straight from the tracker. These could be turned on and off to your liking from each the tracker and within the cell app.

You additionally get a three-day climate forecast app, set to your location. Plus a brand new app, Agenda, which you’ll be able to sync with a calendar.

And, new to the Cost household, are Spotify controls. You may’t really retailer any music on this tracker, as you may with the Versa 2 smartwatch, however you may select the music output, play, shuffle and skip content material, browse current playlists and podcasts, and even Like songs. It requires the premium Spotify subscription.

Now all fashions of the Cost four function contactless Fitbit Pay – which works identical to Apple or Google Pay. On the Cost Three, solely the Particular Version had Pay. That stated, the variety of collaborating banks within the UK continues to be fairly pitiful.

You may set Alarms, and use the tracker as a Stopwatch or Timer.

Sensible Wake lets the tracker set alarms and wake you at the very best occasions relying in your sleep cycles to make sure you’re well-rested and able to wake at an optimum time near whenever you set your alarm.

The tracker comes with 24 totally different clock faces to select from, though these aren’t as dynamic and vibrant as those you may get for the Fitbit Versa and Ionic smartwatches.

Regardless of backlighting, the show could be tough to learn in brilliant daylight and nearly unimaginable to view with sun shades on. Once more, solely the smartwatches repair this drawback.

Show On Settings helps you to alter the time your Cost four display stays on with every view.

Design and straps

The Cost four appears very very similar to the Cost Three. Whereas the Cost Three tracker was manufactured from aluminium, the Cost four tracker has a plastic resin case – so it’s much more light-weight (44g in comparison with 47g) regardless of packing extra inside. The Versa 2 is 60g, so if each gram counts, the Cost four wins on this issue.

It has an inductive, reasonably than a bodily button, on the left edge, which aids its water resistance (as much as 50m).

To navigate to its many options, you faucet, scroll and swipe the backlit 100×160 OLED touchscreen.

The tracker itself comes with each Small and Massive sizes of removable wristband – a swim-proof Traditional band produced from elastomer in considered one of three colors and the black Particular Version, which comes with a Granite Reflective Woven band, plus an additional Black Traditional band.

The tracker itself could be swapped between totally different wristbands. For the Cost four these embrace: Sports activities (£19.99 / $29.95 / €29.95), Horween Leather-based (£59.99 / $49.95 / €69.95), Woven (£24.99 / $34.95 / €39.95), and Traditional (£19.99 / $29.95 / €29.95).

The Traditional and Sports activities bands are sweat and swim-proof, whereas the Woven and Leather-based bands usually are not meant for high-intensity exercises. As such, you’ll must swap to one of many different bands when swimming or working up a sweat.

The accent bands can be found in both Small (matches wrists 5.5-7.1in or 140-180mm) or Massive sizes (7.1-Eight.7in, 180-220mm). Fitbit has a sizing instrument which you can print out to see which measurement matches you.

To make it simpler, listed below are the accessible Cost four bands in all their glory. They match each the brand new Cost four and the older Cost Three. 

Battery life

The Cost four boasts considered one of Fitbit’s longest-ever battery life spans, at as much as seven days – bettered solely by the Encourage 2’s 10 days. Evaluate that to the Apple Watch, which has an 18-hour battery life and normally requires an in a single day cost.

In fact, battery life varies with use and different components. Fitbit claims that it’ll last as long as 5 hours with steady GPS use. Apple says that its smartwatch lasts an hour longer with GPS use.

The tracker comes with its personal charging cable, which unusually appears to be incompatible with the Cost Three and vice versa, however Fitbit has a protracted historical past of making new chargers for every mannequin of tracker and smartwatch.

Battery life is essential as no Fitbit person needs to get up earlier than a protracted stroll or run to seek out their tracker wants charging – a feat that’s tough to realize whereas on the transfer, even with an influence financial institution.

And speaking of waking up, that lengthy battery life permits Fitbit to correctly monitor the standard of your sleep, which the Apple Watch can’t do if it’s charging in a single day.

Fitbit app and Challenges

One of many biggest issues about Fitbit is the straightforward however cell app, the place you will discover the stat-packed customisable dashboard, Leaderboard to encourage you towards/with family and friends, and particular Challenges and Adventures you may set your self or get aggressive along with your buddies.

Alongside the standard Journey races, there is a new Get Match Bingo problem, which you’ll be able to invite as much as 30 individuals to hitch.


The advisable retail value for the Fitbit Cost four is £129.99 / US$149.95 / €149.95. Maintain a lookout for reductions and the greatest Fitbit offers.

There’s additionally a Particular Version Cost four, promoting for £149.99 / $169.95 / €169.95. This presents a few unique wristbands – together with a reasonably natty woven one – however is not any totally different by way of options and features. (Prior to now, Particular Version fashions had an additional function or two, however that is only a distinctive search for that additional few kilos or .)

Cost four vs older and cheaper Fitbits

To closest comparisons are Fitbit Cost four vs Cost Three, the place you would possibly discover a deal on the older tracker, Fitbit Cost four vs Encourage 2, the place you might avoid wasting cash by dropping some options, and Fitbit Cost four vs Versa 2 the place you pay extra for a smartwatch with a big, color touchscreen. 

On the entry-level, the Encourage 2 boasts lots of what the Cost four presents, however lacks the built-in GPS, altimeter, and the power to do extra on the tracker itself with out having to open the Fitbit app. We additionally desire the Cost four’s show. Learn our Fitbit Encourage 2 assessment. 

For all Fitbit fashions, learn our full record of the greatest Fitbit for you – based mostly in your wants and funds. 


We had been large followers of the Cost Three, and we love the Fitbit Cost four an entire lot extra – thanks partly to its nice new options, particularly the personalised Energetic Zone Minutes, which add a brand new motivational health metric to purpose for. It’s our new favorite all-round Fitbit tracker and it bests even the Versa 2 smartwatch with its built-in GPS, and matches even the Versa Three in some ways.

If you’d like on-screen exercises, a color display, voice assistant, and entry to extra apps, you’ll wish to take into account one of many Fitbit smartwatches. However the Fitbit Cost four has all of the features that you must encourage your self to change into fitter and customarily more healthy at a value that we predict is cheap for such a fully-featured wearable.

Fitbit Cost four: Specs

Tracks steps, distance, energy burned, hourly exercise, flooring climbed, coronary heart price, swim tacking, and sleep

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