We wore the Free Shark ring for two full weeks, sleeping with it every night and wearing it during the day for step and heart rate data. The fit is comfortable enough that you forget its there after the first night. Its lighter than the Oura Ring and sits flatter on the finger, which we actually preferred.

Sleep tracking was the main reason we picked this up. The data lined up reasonably well with what our Oura Gen 3 reported on the same nights. Deep sleep totals were within about 10 to 15 minutes of each other most nights. REM detection was a little less consistent, sometimes the Free Shark would show 20 more minutes of REM than the Oura, but at this price point thats not something we’d complain about.

The app is basic but functional. You get a sleep score each morning, a breakdown of your sleep stages, and weekly trend charts. Its not as polished as the Oura app and it doesnt have the coaching features or readiness scores. But honestly? For $50 with zero recurring costs, this delivers about 80% of what a $300 ring with a $72 per year subscription gives you. If all you want is reliable sleep stage data and heart rate trends without paying forever, this is hard to beat.