Google's $99 Fitbit Air Has the Best AI Coach Yet

Google's $99 Fitbit Air launched this month with one headline feature: a Gemini-powered AI health coach that reads your daily metrics each morning and tells you what to do. The hardware is everything Fitbit has always done best — so light you forget you're wearing it, a battery that lasted a full month on three charges, and a 45-minute top-up from 20 percent to 85 percent.

The sensor tracks steps, resting heart rate, sleep stages, blood oxygen, heart rate variability, and cardio load — a measure of how much cardiovascular work your body has absorbed that week. None of that is locked behind a subscription. The $99-a-year Google Health Premium plan (three months free with the Air) adds a workout library, adaptive fitness plans, and access to the AI coach itself.

What the AI health coach actually does

Every morning the coach pulls together your overnight data — sleep quality, heart rate variability, readiness score — and gives you a daily plan: hydrate, skip the strength session, cut your step target in half, prioritize rest. Ask it a question and it'll answer it, cite its sources, and adjust your training plan to changing circumstances. When The Verge's reviewer was traveling while managing medication side effects, the coach generated a travel-friendly, low-impact routine on its own without being explicitly asked.

Nearly 500,000 people beta-tested the Health Coach before launch, giving Google over a million pieces of feedback to work with. The result is noticeably more capable than typical AI health features — less chatty, more willing to cite clinical sources, and direct enough to tell you to go to a hospital if your metrics look bad. One tester's colleague got violently ill; the coach correctly identified the numbers and said to get medical help.

The honest limitation: it learns from what you give it

The Verge reviewer spent five to six hours loading the coach with context before it became genuinely useful: goals, health history, current medications and dosages, three sets of recent blood test results typed out manually, medical records uploaded through the CLEAR identity verification system. After that investment, the advice was personal and accurate. Fellow journalists who put in five minutes got common-sense tips they could have found by searching online.

The coach also has real bugs to work around. It occasionally forgets previous conversations and reverts to older data. It can't read screenshots of test results — manual entry only. After months of updates, the app still showed the reviewer's old daily step goal in some views. Google Health is still a work in progress, and that's not a small caveat for a product asking you to trust it with health decisions.

That said, the Fitbit Air is the rare product that genuinely offers two different experiences in the same hardware. Pay $99, use it as a basic tracker, never touch the AI coach — that works fine, and the free data access alone is better than most competitors at this price. Or invest time in the coach and get something more personalized. In health tech right now, where "AI" usually means marketing gloss, that flexibility is worth noting.