Making a Locked Down Wearable Work Without a Subscription

Hackaday highlights OpenStrap, an open-source app that lets WHOOP fitness tracker users skip the yearly subscription the device normally requires. The developers reverse-engineered the device's proprietary Bluetooth protocol and built the app from scratch, using algorithms derived from public research. All health data is processed locally on your phone at one-hertz intervals, never reaching the cloud—a privacy advantage over the official app. The engineering involved real challenges: the device's hardware clock defaults to Unix time zero without synchronization, and analog sensors required calibration. But the result is solid: OpenStrap now replicates much of the official app's functionality, potentially saving devices from the landfill and keeping user-owned fitness trackers useful without a recurring fee.

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