Live, private detection
Apple's on-device Vision framework spots when your fingers approach your mouth. Tune the sensitivity so casual touches don't trigger, but a real bite does.
NailsGuard
Download
macOS menu-bar app
Catch the habit.
Catch the habit.
Break it.
NailsGuard quietly watches your webcam and nudges you the moment your fingers drift toward your mouth, so you can finally stop biting your nails.
Download on the
Mac App Store
One-time €9
100% on-device. No network access. No frames or data ever leave your Mac.
It sees
Your fingertips creeping toward your mouth, frame by frame, on-device.
You get
Instant nudge
Gentle alert
Bites caught
Clean streaks
Instant nudge
The moment you're caught, NailsGuard fires a notification to interrupt the habit. Pick a gentle or a standard alert style, whatever works for you.
See your progress
A dashboard with bites caught today and over 7 days, a timeline, an hourly heatmap, and streaks, so you can watch the habit fade.
How it works
1
Lives in your menu bar
No Dock clutter. NailsGuard sits quietly in the menu bar, watching when you ask it to.
2
Watches on-device
Your webcam feed is analysed locally with Apple's Vision framework. Nothing is uploaded.
3
Nudges you in real time
Fingers near your mouth? You get an instant notification to catch yourself.
Built to fit your day
Schedule
Only watch during the hours and days you choose. Off the clock means off.
Works on calls
Use your built-in or any external USB webcam — and it keeps watching even while you’re on a video call.
Adjustable sensitivity
Dial detection up or down so it catches real bites without crying wolf.
Streaks & stats
Daily counts, a 7-day view, an hourly heatmap, and clean-day streaks to keep you going.
Private by design
Everything happens on your Mac. NailsGuard has no network access, so no frames, images, or telemetry ever leave the device, nothing is uploaded, and nothing is stored in any cloud. The only thing kept locally is your event stats, simple counts and timestamps, which you can reset anytime.
Read the full privacy policy →Ready to break the habit?
macOS 14 (Sonoma) or later and a webcam. One-time €9, no subscription.