Stop nail-biting with your MacBook's webcam
Hey HN! I made this app because I bite my nails way too much while I code It uses Mac's Vision library to track the location of your hands and mouth via the webcam. Then when it catches you biting, it temporarily covers your screen with a big obnoxious warning. You have to stop biting if you want to continue seeing anything. It's helped me a lot, so I hope it can help other nail-biters here :)
In plain words
This macOS app uses a computer's webcam and Vision library to detect nail-biting while users work. When it identifies biting behavior, the app covers the screen with a warning message that blocks access until the user stops. Designed for developers and others who bite their nails during focused work, the app provides real-time behavioral feedback to interrupt the habit.
written from the facts on this page · September 2026
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