// Link · 26 May 2026

How I Built an iPhone Theft Detection System Using Motion Sensors and Screen Time APIs

Android shipped Theft Detection Lock in 2024. Apple still has nothing. I built a free iOS app that detects phone grabs via accelerometer and locks selected apps using Screen Time shields. The technical rabbit holes: CMMotionActivityManager turned out useless (reports "Unknown" instead of "Running"),...

Hacker Noon

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