Google Fitbit Air $99: lightweight tracker with Gemini AI coach

Google's Fitbit Air costs $99 and pairs a very lightweight fitness band with a Gemini-powered chatbot inside the rebranded Google Health app. The band delivers basic and some advanced metrics while the AI coach is optional and sits behind an optional $99 annual Google Health Premium subscription.

What does the Fitbit Air hardware offer?

The Air is extremely light, comfortable, and delivers strong battery performance: the reviewer charged it three times in roughly a month and regained battery from 20 percent to 85 percent in about 45 minutes when topping up. It tracks steps, resting heart rate, sleep, heart rate variability, blood oxygen, readiness, sleep stages, and cardio load, and supports silent alarms but not push notifications.

The sensor pops out of the strap for swapping, and Google published strap specs so third parties can make alternatives. The Air fits wrists from 130mm to 210mm; the reviewer noted her 5.75-inch (146mm) wrist was near the small end of a comfortable fit. The default textile strap is thinner and sleeker compared with a Whoop band, and the device is designed to look like a bracelet more than a chunk of hardware.

How does Google Health Coach work?

The Health Coach is a Gemini-powered chatbot that summarizes morning sleep and readiness metrics, suggests daily actions, answers questions about health data, and will defer to health professionals rather than provide diagnoses. Nearly 500,000 people beta-tested the coach since October 2025, and Google said it had over a million points of feedback before shipping an improved version last month. The coach can generate tailored plans, for example lower-intensity travel workouts and reduced step targets, but it requires heavy user input to perform well.

In practice the coach can be useful if you invest time: the reviewer spent five to six hours telling the coach goals, uploading about 10 years of medical context, listing medications and dosages, and manually entering blood tests. Even after that, the coach sometimes reverted to older data and forgot prior conversations, and some changes like a new, lower daily step goal did not persist across the app. Uploading medical records requires identity verification through CLEAR and periodic permission renewals. The coach also now provides sources for health facts and lets users upload records for more context.

Why it matters

The Air separates hardware from software choices so buyers can opt out of AI features. For $99 you get a capable, lightweight tracker and full access to basic tracking data without subscription paywalls. If you want the AI coach, Google bundles it in Google Health and in a Premium tier that costs $99 per year. The AI coach represents a middle path: it is more useful than some early consumer health chatbots but still demands time and attention, so outcomes will vary with how much effort a user invests.

This matters because consumer wearables are moving from passive tracking into prescriptive AI interactions. The Fitbit Air shows one practical approach: keep the hardware simple and affordable while offering an optional, data-intensive AI layer that can be turned on or ignored. That split preserves a low-friction option for users who only want step and sleep data, while letting more motivated or medically engaged users try to get extra value from the coach.

What to watch

Watch whether Google fixes context persistence and reduces the manual setup burden for the Health Coach, and whether third-party makers ship strap options now that Google published specs. Also note whether Google expands the coach to more third-party wearables and whether the company continues to iterate on the Health app based on user feedback.

"The AI coach requires a lot of handholding, but it’s the best I’ve tested so far," the reviewer wrote, capturing the trade-off: promise plus friction.