In a pool test against smart goggles, the Apple Watch Series 12 matched the data exactly, while the Fitbit Edge logged a longer swim.
A Tom's Guide reviewer swam 1,400 meters wearing the Apple Watch Series 12 and the Fitbit Edge, and the Apple Watch came out more accurate. Its numbers matched a pair of Speedo iQ Vanisher 3.0 smart goggles, used as the control. The Fitbit logged a longer swim and a few extra lengths than the goggles did.
Both trackers use motion sensors in the watch to spot arm pulls. From that, they work out strokes per length and strokes per minute. The Apple Watch asks for the pool length before you start, so it shows lengths swum as you go. Afterward, it breaks down distance by stroke. The Fitbit Edge does neither.
The reviewer said the length count let them listen to a podcast without keeping track, and they usually switch strokes every 10 lengths. Heart rate came from an Oura Ring 5, which showed an average of 129 beats per minute for the swim.
The text does not give prices or release dates for either device. It also does not say how much longer the Fitbit's swim was. This was one test by one reviewer, who plans to keep testing wearables in the pool.
For serious pool workouts, the Apple Watch Series 12 tracked more accurately in this one test, while the Fitbit Edge suits simpler needs.
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