B4 · Hall of smart-shame Oh no, you didn’t?

Oura Ring 5

By Oura.

Amazon US, October 2026. Prices change.

A ring with sensors that tracks your sleep, heart rate and recovery, and keeps most of its insights behind a monthly membership. Stop paying and it mostly stops talking.

Local

Bluetooth, RF or NFC. An attacker has to be nearby.

Cloud-dependent

Needs the maker's servers or app to work, so the maker can switch it off.

Buy the dumb one instead

• Believe Training JournalLevel 0 · No electricity · Dumb as a rock $21View
• Casio HS-3V stopwatchLevel 2 · A quiet chip · Dependable doofus $45View

We do not link to the smart one. You can find it.