Fitbit Air Review: Is It Really a Smartwatch Killer?

After two weeks of having it practically glued to my wrist, the Fitbit Air is starting to grow on me. But I’ve also experienced some major smartwatch withdrawals. 

I’ve lost count of how many times I’ve glanced down at my wrist expecting to see the time, only to be met with a blank band staring back at me like, “What?” Between that and the fact that it couldn’t ping my phone, there were moments the Fitbit Air felt like it was freeloading on my wrist.

But the longer I wore it, the clearer it became that this thing isn’t out to replace my smartwatch. And once I stopped expecting it to behave like one, I almost forgot it was there. Which, turns out, is its biggest selling point.

As someone who first strapped on the original Fitbit Surge when fitness trackers were still a novelty, there’s something full-circle about wearing the Fitbit Air. It strips the category back to its original premise: Wear it, forget it, check the app later. Except now the sensors are a lot more capable and can track much more than just steps, the design is more discreet and the AI health coaching (although hit or miss) can be genuinely helpful.

Rather than a true rival to the Apple Watch or Pixel Watch, Google’s $100 screenless wrist band that tracks your health feels more like an antidote for anyone who ruled out smartwatches because of the noise and bulk. No distracting notifications, no mobile payments, no glanceable data you’re expected to act on immediately — not even the damn time. Just a slim, comfortable band that tracks your health around the clock and gets out of your way.

The eight-day battery life meant it rarely left my wrist, so the sleep data felt more consistent and useful than what I typically get from a smartwatch. The readiness score also has an annoying habit of nailing my energy levels for the day, inadvertently becoming the litmus test for how many espressos I’ll need to get my day properly started.

Google didn’t invent the screenless wearable, but the Fitbit Air may be its clearest attempt yet to make the category mainstream.

At $100, it sits well below the price of an Oura Ring Gen 4 ($349) or even a year of Whoop membership ($239 a year), both of which offer similarly discreet, recovery-focused tracking experiences. But those platforms are still relatively niche, built around dense performance data and optimization culture. Fitbit’s approach leans into simplicity that, while less exhaustive, feels less like homework.

What the Fitbit Air gets right

Design and comfort

There’s only so much you can do with a fitness band, but within the parameters of strapping a sensor to your wrist, Fitbit nails the aesthetic. The bands available at launch, while pricey for a band (they start at $35), are trendy and versatile enough to pair with most casual wear. The woven band looks cool, but takes a while to dry after getting wet. Silicone is easier to maintain but leans sporty. And I’m sure it’s only a matter of time until the third-party band marketplace for this thing goes nuts and we even have band options that pass for jewelry, which is totally realistic considering how small and easy to swap the sensor is. 

It’s so comfortable, in fact, that I stopped noticing it (minus the soggy post-shower moments). The sensor is slimmer and lighter than the similarly priced Fitbit Inspire, and roughly half the size of the Whoop band sensor.

Battery life and long-term wear

Fitbit says the Air lasts seven days on a charge, but mine held on for eight days with regular workouts and nightly sleep tracking. For context, the Pixel Watch 4 barely clears a day and a half with an always-on display. The newest Whoop, by contrast, lasts almost two full weeks on a charge. 

Not having to charge so often meant the Air sat uninterrupted, collecting data on my wrist for eight days — and more importantly, eight nights — straight. That’s a lot more than I can say about my smartwatch. Some of the most valuable health data such as sleep quality, resting heart rate, HRV and skin temperature is collected overnight, which is exactly when most smartwatch owners (myself included) put their devices on the charger. Missed nights mean gaps in your baseline, and gaps in your baseline make it harder to detect trends over time.

App interface 

Google’s takeover has diluted some of the old-school Fitbit charm, but the core philosophy is still intact. Despite multiple redesigns and a rebrand — the app is now officially called Google Health — it still carries that same visually digestible energy, the kind my mom could navigate without calling the family IT (me). That sounds like a low bar, but in a category dominated by dense dashboards, recovery graphs and optimization jargon, simplicity is underrated.

It also stays just present enough to be useful without being overbearing. The app sends notifications when sleep scores are ready or when the battery is running low.

Where the Fitbit Air falls short

Training you in the moment 

For all its strengths as a passive health monitor, the Air struggles the moment you actually start moving. Without a screen, live workout metrics such as pace, heart rate zones and duration require your phone to be in hand and the app open. 

You can manually start workouts in the app, but most of the time I couldn’t be bothered or my phone wasn’t on me. The Air’s automatic workout detection only reliably recognizes a handful of higher-intensity activities out of the box, which means lower-impact workouts like Pilates often slipped through entirely, even when my heart rate was clearly elevated beyond the norm. The app lets you manually input the workout after the fact, or you can tell the AI health coach to plug it in for you. Google says the detection improves over time, eventually learning to recognize more than 100 activity types based on your habits, so maybe future me will finally get credit for a Pilates workout, but for now it’s worth flagging.

GPS tracking is also fully phone-dependent, which I learned the hard way during a six-mile hike through Yosemite with a 40-pound toddler strapped to my back. No signal meant no route map, no accurate distance tracking and — most painfully — no elevation data. I fully intended to use that elevation gain as my flex medal after the ordeal.

The Air correctly recognized the hike as cardio chaos, logging a cardio load roughly 10 times my daily average. But the constant snack breaks and repeated “Can I take this rock home?” interruptions confused the workout detection enough that it split the hike into three separate walks totaling two hours instead of the actual four. I felt robbed. 

Women’s health: A missed opportunity 

The biggest miss for me is menstrual cycle tracking. Google has the basics — a calendar where you log your period manually — but none of the Air’s temperature data factors into the cycle tracking. That means my predicted fertile window is completely off. Whoop, Oura and Garmin surface temperature variations directly within cycle tracking so you can see exactly when ovulation happens and realistically use that data for family planning. That feature alone has been a major selling point for me. 

The Air does track skin temperature variations, but they live in a separate section of the app and it’s on you to find them and connect the dots yourself.

The Health Coach does factor in hormonal changes into training recommendations, which I learned can be an important factor in training readiness, but the timing isn’t as precise when its based on general predictions. One of the biggest revelations of wearing a Whoop band was when it warned me I might be feeling fatigued during a workout because of where I was in my cycle. It was spot on. 

Health and fitness tracking 

Beyond the core metrics you’d expect from any fitness tracker such as steps, distance, resting heart rate and sleep, the Fitbit Air covers blood oxygen levels via the SpO2 metric, skin temperature variation, cardio load, heart rate variability and irregular heart rhythm notifications that can flag signs of atrial fibrillation. Passive AFib detection on a $100 device is genuinely impressive, and might be a selling point for anyone with a family history of heart arrhythmias or who just wants a low-stakes early warning system on their wrist.

It’s also water resistant to depths of up to 50 meters, meaning you can use it for swim tracking, too. 

Accuracy: Good, with a catch

I took the Fitbit Air to a local high school track to run (literally) some of our standard accuracy tests. Step tracking was nearly flawless, finishing with just a seven-step difference out of 2,500 steps counted manually with a tally clicker. That’s an error margin of 0.3%.

Distance tracking was slightly less impressive. To test the Air on its own, I put my phone in airplane mode so the watch couldn’t rely on connected GPS, which it does by default. On a measured track, the Fitbit Air overestimated distance by roughly 0.2 miles (out of one mile). Over longer runs, that discrepancy could add up and misrepresent your training. 

Heart rate tracking stayed within three beats per minute (bpm) of a chest strap on average –a strong result for a wrist-based device. However, peak readings were less accurate. When tested against the Polar H10 chest strap, considered the gold standard for consumer heart rate tracking, the Fitbit Air failed to capture the spike during my final sprint and lagged by 17bpm at peak effort (168bpm versus 180bpm on the chest strap).

It’s reliable enough for most moderate-intensity workouts, but during high-intensity interval training or sessions with rapid heart rate spikes, it can underreport your actual effort.

Read more: I Ran 30 Miles With 5 Smartwatches. Here’s the One You Can Actually Trust 

Sleep tracking was the unexpected highlight

I usually hate sleep tracking. Mostly because I’m a lifelong night owl forced into early mornings by tiny children, and I don’t particularly enjoy having a wearable confirm what I already know: I should be sleeping more.

But the Fitbit Air ended up shifting my relationship with the data a bit. It tracks more than just time in bed, which, as any exhausted parent knows, only tells part of the story. Sleep quality, interruptions, restlessness and recovery all factor into the score, and surprisingly, I’m pretty good at the quality side of things even when the quantity is questionable.

The tracking was detailed enough to accurately log the exact moments a small human climbed into my bed at 2 a.m., and over time I found myself paying more attention to patterns instead of just using it to validate my exhaustion. The Fitbit Air also includes a Smart Wake alarm that uses sleep cycle data to wake you during a lighter stage of sleep using gentle vibrations instead of a fixed alarm time. But since I have my own toddler alarm clock, I didn’t test this one out. 

I also didn’t test whether it detects naps, mostly because I’m writing this review instead of taking one.

An overeager AI health coach

The Health Coach is a Gemini-powered assistant that pulls from your fitness, sleep and heart rate data to build personalized training plans, suggest workouts with video demos and adapt recommendations based on your recovery. It also reflects Google’s broader strategy: shifting from one-time device sales toward ongoing AI subscriptions, while positioning the band as an entry point for both Android and iPhone users.

It’s useful, but not essential. Most of what it surfaces are patterns you could probably piece together yourself. What it does well is make those connections obvious, which turns out to be more valuable than it sounds.

It flagged that my low readiness score was likely tied to a late-night workout the night before and suggested shifting my bedtime earlier to improve recovery. At one point, it even explained which muscle groups a 50-pound stroller run was hitting: stabilizers, core, posterior chain, and offered to adjust my workout load to account for it.

But the personality of it is where things get interesting. Some days it feels like that insufferably positive gym membership salesperson. Other days, it’s closer to a mildly nagging parent.

At one point, it checked in three separate times to ask whether I had completed a Pilates session I’d added to my plan. When I didn’t, it pivoted immediately and commended me for “listening to my body” and taking it easy.

This is a coach so committed to keeping me subscribed to Premium that it has started praising me for ignoring its own advice. 

Pricing and premium

The Fitbit Air costs $100 and comes with a three-month trial of Google Health Premium baked in. After that, the Premium subscription costs $10 a month or $100 a year. And if you’re already paying for Google AI Pro or Ultra, it’s included at no extra cost.

You can also forego the membership completely, which may be the biggest advantage over a Whoop band like the new Whoop 5.0 tracker. Activity tracking, sleep, heart rate, SpO2 and AFib detection all work without a subscription. What you’re paying for with Premium is the Health Coach, adaptive training plans, detailed sleep insights and proactive recovery recommendations. 

The Fitbit Air also works with both iOS and Android devices, which means you can get the Gemini-powered Health Coach on your iPhone, too. I tested the Air with an iPhone 14 Pro, and while the app was slow to sync with the band (likely because I’m testing the beta version), I didn’t have any FOMO moments from going outside the Android ecosystem. It also syncs with Apple Health, which I personally avoided because I test a lot of fitness platforms and I like to keep my data siloed to its respective app. 

The privacy caution tape 

Google says health data collected by the Fitbit Air is not used for advertising, and existing commitments keep Fitbit health and wellness data separate from Google’s ad business. For most people, that’s probably enough reassurance.

But it’s worth understanding what you’re actually signing up for, especially with Premium. The Gemini-powered Health Coach is designed to get more useful the more health info you share with it, and connecting medical records such as lab results or clinical history will grant more personalized insights, Google says. That’s opt-in, and you can choose not to, but it signals where this platform is heading.

Sleep patterns, heart rate trends, breathing rate and cycle data are already some of the most personal information you can hand over to a company. Google hasn’t fully explained how that data gets processed across its AI features over time. 

None of this is unique to Google. But it’s worth knowing that the Fitbit Air (and any connected health platforms for that matter) are now an entry point into a larger ecosystem that’s still being built.

Should you buy the Fitbit Air?

The Fitbit Air is not a smartwatch replacement. It can’t ping your phone, surface texts or let you tap to pay for your coffee, and it falls short for those in-the-moment workout insights. If those things are important to you, you may have to move on or double up. And the $100 price tag means you feasibly can without breaking the bank. I’d probably wear both if I didn’t have a looming backlog of wearables to test on my wrist once my testing period of the Fitbit Air is over.

Yet it’s the most accessible entry point into screenless health tracking so far, and a logical companion for existing smartwatch owners who want more consistent overnight data without worrying about daily charging. Google even supports pairing it alongside a Pixel Watch, positioning the two as complementary rather than competing.

If you’ve been curious about wearables, but put off by the data-heavy, subscription-first world of Oura and Whoop, the Fitbit Air’s $100 price and familiar platform make it an easy way in. And if you already wear a smartwatch, it solves one of the biggest blind spots: uninterrupted sleep tracking.