Fitbit Air Review: $100 Hardware Win, $10 AI Coach Loss

For its first display-less fitness band, Google built something the company is rarely credited for: a tight, light, $99.99 piece of hardware that does almost everything you want a $100 tracker to do. The Fitbit Air, on shelves May 26, weighs 5.2 grams without a strap, lasts close to a week between charges, and snaps in and out of three different bands with one push.

And then there is Health Coach, the headline AI feature Google built the whole Google Health Premium subscription around. In testing, that coach invented a six-mile run that never happened, conjured a 15-minute kickboxing session out of nothing, and forgot weight-training sets it had already commented on. The band is the easy recommendation. The $9.99-a-month chatbot strapped to it is not.

Google’s First Display-Less Tracker Lands at $100

The Fitbit Air went up for pre-order on May 7 and reached U.S. shelves on May 26. The standard edition lists at $99.99 in four polyester colorways; a Stephen Curry-branded Rye edition sits at $129.99. Each unit ships with a three-month trial of Google Health Premium, the rebranded successor to Fitbit Premium, which renews at $9.99 monthly or $99 yearly.

The pitch is a Whoop competitor for buyers who refuse the annual subscription model. Whoop 5.0 carries no upfront cost but locks users into $199 a year for its entry tier, with no free option. Google’s flip of that math, hardware you own outright with optional software on top, is the most aggressive piece of pricing the company has ever brought to wearables.

It also marks the formal end of the Fitbit app. The companion software has been folded into Google Health, a redesigned shell that surfaces sleep, fitness, and metrics tabs alongside the new coach. Long-time Fitbit users have already lined up to complain about the transition. They have a point. The new app is busy, with widgets, tiles, and overlapping metric pages competing for attention on a single home screen.

Google’s official spec sheet lists 24/7 heart-rate monitoring, AFib (atrial fibrillation, an irregular heartbeat) alerts, blood-oxygen and skin-temperature sensors, sleep staging, and automatic workout detection. The full breakdown is on the official Fitbit Air announcement page. The most interesting line on that page is the one Google does not foreground: no display, no GPS (Global Positioning System, satellite location tracking), no NFC (Near Field Communication, used for tap-to-pay).

The Hardware Google Mostly Got Right

The tracker itself is a small rounded pebble that pops into its band with one push. There is no metal-arm latch like Whoop’s, no fiddly pin, no risk of snagging the mechanism in a travel bag. The single status light, a tiny LED that shines through a cutout on the underside, doubles as a battery indicator when you double-tap the device.

That double-tap is the only physical input on the entire product. In two weeks of daily wear, it failed to register on the first try a handful of times, mostly during band swaps. It is not a deal-breaker, because the band’s battery life is generous enough that you rarely need to check.

How generous? Google promises up to seven days. After a full week of continuous wear with auto-workout detection on, the test unit landed at 16% before bed. Half an hour on the proprietary magnetic charger pushed it back near 80%. The charger plugs into any USB-C brick, which matters for a band that buyers will absolutely take on two-week trips.

• 5.2 grams for the bare tracker, 12 grams with band attached
• 8.3 mm thick across the pebble’s widest face
• 7 days claimed battery life, with five-minute fast charge for a full day
• Water resistance to 50 metres for showers, pool sessions, and ocean swims

The only genuine ergonomic complaint is the lack of a physical orientation key. Insert the pebble upside down and nothing stops you; the only signal is the missing battery-light cutout on the visible face. A small notch or tab, the kind Nintendo used to keep 3DS game cards out of original DS slots, would have closed the loop.

Three Bands, Three Wildly Different Experiences

Google ships the Air with a default Performance band and sells two upgrade options at $34.99 and above. Spending more does not get you a better band. It gets you a worse one.

The Performance band is a polyester loop with a velcro closure. It is light, dries fast, sits well overnight, and is the only band of the three that is genuinely pleasant to wear during sleep. The Active band, despite being marketed for workouts, is a basic silicone strap without breathing holes that runs hot the moment you start sweating. The Elevated band, pitched for nicer evenings, uses a finicky hook closure that never lands at a comfortable tightness on the first or fifth attempt.

The takeaway is that the bundled Performance band is what most buyers will keep wearing, which is good for wallets and bad for Google’s accessory revenue line. If the Active strap had picked up the fluoroelastomer treatment that the Pixel Watch’s sport band uses, the calculus might be different. It did not.

Sensors, Accuracy, and the Missing GPS

For $100, the sensor stack on the Air punches well above its weight. Inside the pebble sit an optical heart-rate monitor, an accelerometer and gyroscope, red and infrared sensors for blood-oxygen tracking, a skin-temperature probe, and a vibration motor for silent alarms. The only meaningful omissions next to the $159.95 Fitbit Charge 6 are ECG (electrocardiogram), EDA (electrodermal activity, the stress-sweat sensor), built-in GPS, and tap-to-pay.

The accuracy holds up. Auto-tracked runs, with the Air paired to a phone instead of relying on onboard GPS, came in within a margin of error against a cellular Apple Watch running on the other wrist. Time, distance, and average heart rate matched. Auto-detection of workout start and cooldown was sharper on the Air than on the Apple side. Burned-calorie counts are unverifiable in absolute terms, as they are on every tracker, but the Air’s numbers tracked consistent week to week.

Where the underlying scoring breaks is the readiness metric, which blends heart-rate variability with the previous night’s sleep score into a single high, moderate, or low rating. Days flagged green produced sluggish workouts; days flagged red produced personal-best sessions. The metric does not ask the user how they feel before assigning a score, and the gap between the rating and the lived experience is wide enough that the number is best ignored. A morning check-in prompt would close it.

Strength training is the other weak spot, as it is on every wrist tracker. The Air clocks heart rate and total session time during lifting but cannot tell a bench press from a row. It is no worse than the competition here, which is faint praise.

Where Google Health Coach Goes Off the Rails

Health Coach is the feature Google built the whole subscription pitch around, and in two weeks of daily use it produced enough errors to make the $9.99-a-month asking price difficult to defend.

The Phantom Workouts

The single worst incident: Health Coach generated a daily summary that praised a six-mile run the wearer never took, then built that day’s recovery advice around the imaginary effort. Separately, a 15-minute kickboxing session appeared in the day’s log without explanation, traceable to either the auto-detection layer or the chatbot’s own narrative pass. Manually deleting it threw an error and took more than 24 hours to clear from the account.

The Memory Gaps

Health Coach also forgot workouts it had previously discussed. Back-to-back weightlifting sessions the chatbot referenced earlier in the week vanished from its recall when asked about them later. The only way to surface them again was to take a screenshot of the same data inside Google Health and paste it back into the chat. A coach that needs the wearer to feed it the data it already has access to is not, in any useful sense, a coach.

The Calendar Confusion

At one point Health Coach told the wearer that Fitbit tracking runs on a rolling seven-day window. Fitbit weeks run Sunday to Saturday. The chatbot also pulled prior-week workouts into the current week’s tally and counted them twice. The discrepancy is small in isolation and corrosive in aggregate: the entire premise of personalised guidance is that the underlying calendar arithmetic is right.

The errors are not life-threatening. Google has guardrails on what Health Coach is allowed to recommend, and none of the tested sessions surfaced anything reckless. The problem is more boring than that. A subscription chatbot that requires the user to fact-check every response against the raw data is selling a service the data already provides for free.

The Math Versus Whoop and Pixel Watch

The Air’s real competitive case is not against Health Coach. It is against the broader screenless-band market, where Whoop has owned the conversation for years, and against Google’s own Pixel Watch line a tier above.

The math is unambiguous at the entry point. A buyer who skips the Premium subscription owns a working Whoop alternative for under a hundred dollars and never sees a renewal email. Whoop’s hardware-with-mandatory-subscription model has no answer to that, and the gap widens by year three.

The trade is the missing display, GPS, and tap-to-pay. For shoppers who want any of those, the Pixel Watch 3 or a Fitbit Charge 6 are the better fits. For shoppers who want a band that disappears on the wrist and just keeps logging, the Air is the obvious pick, with or without the coach.

Buy the band, run through the three-month Premium trial, and at month two decide for yourself whether Health Coach is talking about your actual week or a week it imagined.