New iOS app turns your hand into the only way to read the screenthe whole screen stays blacked out.you rest the side of your hand on it like you’re shielding a keypad at an atm. only the part your hand covers becomes readable.lift your hand, it goes dark again.how it works:- multi touch area detects your hand on the screen, no camera, no permissions needed- proximity sensor was the first attempt, just turned the screen off- skipped the camera on purpose, asking for camera access in a privacy app