I ran 10km wearing the Google Fitbit Air and the Apple Watch Ultra 3 — here are all the differences in heart rate,…

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The GoogleFitbit Air is here, and early adopters are getting to grips with the new screenless fitness tracker and its AI-powered premium Google Health Coach.

I've shared my early thoughts after a few hours of testing and we've covered existing Fitbit users' disappointment and anger over some of the app changes — but how does it compare against an Apple Watch, perhaps the best-known and certainly the most commonly-spotted fitness wearable on wrists everywhere?

To find out, I went on a 10-kilometer evening run (braving the UK heatwave) with the Google Fitbit Air on one hand, and the Apple Watch Ultra 3 on the other. I was also wearing the Polar H10 heart rate monitor, intending to use it as a litmus test for accuracy, but the chest strap malfunctioned so I don't have any meaningful results to publish here.

I'm primarily looking at metrics such as heart...

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