Both the Apple Watch Series 12 and the Fitbit Edge are designed to do more than just count your steps, calories and sleep. They can both track multiple sports, but which one comes out on top in the water? I swam 1400 metres with both devices, using my Speedo smart goggles as the control — read on to find out more.

Before we dive into the data, check out our Apple Watch Series 12 review and Fitbit Edge review on Tom’s Guide here.

Let’s start with how these trackers measure your swimming workouts. Both use an internal accelerometer and gyroscope to recognise arm pulls and calculate how many strokes you take per length, as well as your stroke rate (strokes per minute). That said, there is a slight difference between the two trackers.

Before starting a swim workout, the Apple Watch Series 12 asks you to confirm the length of the pool you’re swimming in. This means during the workout, you’re able to see at a glance how many lengths you’ve swum. The Fitbit Edge doesn’t have a similar feature. When you get out of the pool, the Apple Watch will also give you a breakdown of how far you swam in each stroke, whereas the Fitbit Edge doesn’t.

0 goggles. These smart goggles give you a wealth of data when you’re back on dry land. As well as your pace, distance, and how long you spent resting at the side of the pool, you’ll also be able to see your head position, breath time and distance per stroke for each stroke.

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