MocLG/Overlay-Guard

Overlay Guard is technically ambitious and unusually specific in a good way. It is not a generic “privacy screen” app; it targets Android 13+ devices, uses the front camera with CameraX and ML Kit face detection, and blanks the physical display through Root or Shizuku-backed privileged execution. The README is excellent for a systems-heavy Android project: it explains execution backends, hidden SurfaceControl display strategies, foreground service behavior, adaptive sensor polling, wake locks, failure modes, and logcat capture commands. The Gradle setup matches the claims: Kotlin, Compose/Material 3, CameraX, ML Kit Face Detection, Shizuku, SDK 34, Java 17, and release minification. Simulating usage, I can see the app serving a real niche: start monitoring, detect a second face near the display, and blank the screen without fully locking the phone when the device/ROM allows it. The improvement area is user onboarding and safety. Because this touches root, Shizuku, hidden APIs, camera access, and display power behavior, screenshots, ROM compatibility notes, and a risk/limitations table would help a lot. Automated tests may be hard here, but a documented manual test matrix across devices would make the project feel even more reliable.