Fitbit Air vs. Whoop 5: Is Google's Attack on the Display-Less Fitness Tracker Any Good?

TVS News AI, editorially supervised, presents Fitbit Air vs. Whoop 5: Is Google's Attack on the Display-Less Fitness Tracker Any Good.

Display-less fitness bands were long Whoop's playground. Now Google is sending Fitbit, an original pioneer of fitness tracking, into the race. Heise+ has pitted the Fitbit Air against the Whoop 5 — on the iPhone, with a clear focus on three disciplines: measuring, interpreting, coaching.

What makes this test special: it evaluates not only what the sensors capture, but also how the apps turn that data into recommendations for everyday life. That is precisely what distinguishes a classic fitness tracker from a display-less band with coaching ambitions.

You're torn between the Fitbit Air and the Whoop 5, or wondering whether a band without a display is the right concept for you in the first place? Then it's worth taking a look at the detailed Heise+ comparison — here are the framework conditions you should know beforehand.

Display-less was Whoop — and with Fitbit Air, it is no longer alone

Anyone who has been looking for a fitness band without a screen in recent years almost automatically ended up at Whoop. The company has shaped the segment for years — wristband, app, and subscription model as a single unit. With the Fitbit Air, Google is now sending a competitor into the field that itself belongs to the originals of fitness tracking.

Heise+ tested both devices in a direct comparison and broke the question into three parts: What is measured (heart rate, sleep, strain, recovery), what does the app say about it, and what coaching recommendations does it deliver? This exact three-part structure runs throughout the test.

What sets a display-less fitness band apart from a smartwatch

Unlike an Apple Watch or a classic fitness tracker with a display, a display-less band on your wrist initially shows you nothing. No step count at the press of a button, no notifications, no app selection directly on your arm. The sensors work in the background, and the analysis happens entirely in the smartphone app.

For you, this means: you open the app in the morning and get an assessment of your sleep, recovery, and daily form. That is a different promise than devices with screens — and it demands more trust in the algorithms.

What the Heise+ test pays particular attention to

Heise+ tests the Fitbit Air and Whoop 5 explicitly on the iPhone. That's a relevant detail, because Fitbit has historically been more tightly tied to Android, while Whoop functions similarly on both platforms. Three focal points run through the comparison:

• Measuring: How accurately do the sensors work for heart rate, sleep, and strain in everyday life?
• Interpreting: Which metrics does the app provide, and what do they mean for someone who doesn't train every day?
• Coaching: What concrete recommendations do Fitbit and Whoop give, and how reliable are they?

Conclusion: Read first, then commit

Anyone torn between the Fitbit Air and the Whoop 5 gets a solid decision-making foundation with the Heise+ test — measured on the iPhone, evaluated in exactly the three areas that make the difference for a display-less band. Keep in mind, though: with both devices, you typically tie yourself to the service via a subscription. Before signing up, it's worth taking a close look at the cancellation terms, the coaching features tested, and how mature the respective iPhone app really is in your everyday life.

You can find the complete test with all detailed figures at Heise+ — the comparison is thorough and delivers exactly the data you need for your decision.

11 things you should keep an eye on around display-less fitness bands

1. Don't expect a display — expect analysis

You won't get any direct feedback on your wrist. The analysis happens in the app in the morning. Anyone who wants to see numbers on their arm immediately is poorly served by a display-less band.

2. Check the subscription model before buying

Both Fitbit (Premium Coaching) and Whoop work with paid tiers. Calculate the monthly costs before buying and clarify what happens after trial periods.

3. Test sensor position on the forearm

Heart rate and sleep sensors only measure cleanly when the band is firm but not too tight. Try out different positions on the forearm during testing to find where you get the most stable readings.

4. Check iPhone pairing in everyday use

Since Heise+ tests on the iPhone, it's worth taking a closer look at the evaluation for iPhone users. Anyone who switches between iPhone and other devices should test the app synchronization beforehand.

5. Sleep tracking requires consistency

Display-less bands really shine with sleep tracking. But that only works if you actually wear the band every night — including on vacation and trips.

6. Build in a charging routine

Even though battery life on display-less bands is often several days, the dead battery catches you exactly on the important measuring night. Plan a fixed charging time.

7. Clarify data export before signing the contract

Check whether you can export your measurement data from the app. Anyone who wants to maintain long-term control over their own health data should clarify this before signing up.

8. Multi-device sync and profiles

If multiple people in the household want to participate: check how many profiles a subscription covers and whether the data of individual users is kept cleanly separate.

9. Factor in algorithm updates

Both manufacturers regularly change how they interpret data. An app update can suddenly make your recovery values look different — that's normal, but good to know.

10. Check water resistance for everyday use

Especially when swimming, showering, and in the rain, it becomes clear how truly suitable a band is for everyday use. Anyone who wants to wear the band around the clock should look for the appropriate certification.

11. Understand coaching as guidance, not diagnosis

App coaching is not a personal trainer. It provides trends and recommendations, but it doesn't replace individual guidance. For serious health concerns, always seek medical advice.