Loopr is a free iPhone app that reads your fitness band over Bluetooth and works out sleep, recovery and strain on the phone. It has no account and no server. These pages cover the app.
Privacy policy. What Loopr stores, where it stays, and what Apple shares with me during TestFlight.
Terms. The rules for using the app, including what it is not.
Notice. Who Loopr is not affiliated with, and the open-source work it credits.