(Image credit: Sanuj Bhatia / Tom's Guide)
Ever since the Fitbit Air launched in May 2026, the conversation has almost always been about its price point. Reviews have been calling it a "$100 Whoop killer," and even we named it the best Whoop alternative for the rest of us. But one thing everyone seems to be missing is whether the tracking is actually any good.Sure, it costs less, but does the Fitbit and Google name automatically mean it's great at tracking your health? Does it even give insights that are, first of all, accurate and then actually useful?I've been tracking my sleep with both the Fitbit Air and the Whoop MG for a week, and the Fitbit Air actually held up much better than I expected. It's not perfect, though, and there are a few things you should know before buying one.Here's how I tested both trackers side by side
(Image credit: Sanuj Bhatia / Tom's Guide)Before we get into the numbers, there's one thing worth knowing upfront: I've been using the Whoop MG for over a year now. It's been my primary fitness and health tracking device for that entire time, which means it has a lot more context about my body compared to the Fitbit Air.I got the Fitbit Air around June 16 and started properly testing it from the night of June 17. For this test, I wore the Fitbit Air on my left, non-dominant wrist, while my Whoop MG has been on a bicep band on the same arm for the past three months. I tracked a full week across both devices from June 17 to June 25, with two nights being an exception where I actually slept without any of the bands because I fell sick.Before we dive into the numbers, though, it's worth knowing that since the Fitbit Air was brand new out of the box, it was still building its baseline during the first couple of nights.
