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Evident owns Sleep Karma. Here's how we score every brand, including our own.

Sleep Trackers

Wearable sleep trackers compared on accuracy (validated against polysomnography), feature depth, privacy posture, and subscription economics. Whoop, Oura, Apple Watch, Garmin, Fitbit ranked.

We buy every product ourselves. Hands-on multi-tester trials; lab checks when we commission them. Our methodology

Guides & Research

Featured Guide

🔬 Research

Are Sleep Trackers Actually Accurate? What the Polysomnography Research Shows

Whoop, Oura, Apple Watch, Garmin, and Fitbit all claim accurate sleep tracking. Polysomnography says 'sort of.' Here's what the published validation studies show, why every consumer wearable struggles with REM specifically, and which brands have the strongest independent data.

Apr 11, 2026

More Brands Tested

5 more sleep trackers brands we’ve evaluated

Shorter evaluations of additional brands we tested but didn’t include in the main review set.