I recently switched from hybrid home office to being fully remote. I realized I'd developed a new habit: biting my nails, something I never did in the office.

I've built a small utility app that lives in your macOS menu bar and uses the webcam to detect when you start biting your nails or touching your face. All processing happens on-device, and no data ever leaves it. Detection's frames per second and some overlay styles can be customized.