January 26, 2026
Hands off; drama on
Show HN: A desktop app that blocks work when you bite your nails
Webcam coach stops your nail biting — cheers, confessions, and chaos in the comments
TLDR: A webcam-powered app warns you when your fingers approach your mouth to curb nail biting, with all data staying on your device. Comments range from grateful praise and a powerful habit-break story to snarky jokes about swapping habits, sparking debate on whether nudges solve the root problem or just redirect it.
Show HN just dropped a quirky hero: TrackHands, a tiny desktop app that watches your webcam and flashes a warning when your fingers drift toward your mouth. Think of it as a digital “hey, stop that” for nail biting, with all processing kept local for privacy and zero cloud creep. The community reaction? Equal parts wholesome, raw, and chaotic.
Fans are clapping (“Thank you for making this”), while hype squads cheer “2026 is here!” like it’s the year we finally stop slouching and chewing. The most heartfelt voice comes from a user who beat dermatophagia (compulsive skin biting) during WFH by wearing cotton gloves, now wondering if gentle on-screen nudges can help others break the cycle too. Then the jokesters arrived: the top hot take suggests just swapping nail biting for lip biting—cue groans and laughing emojis—sparking debate over whether habit-blockers fix the root problem or just reroute it. There’s mild side-eye about an always-on camera, but the dev insists everything stays on your device. Meanwhile, memes are flying about the app “screenshotting incidents” like it’s catching you in 4K, and folks are treating the detection speed like game difficulty: easy mode for saints, hard mode for chronic nibblers. Drama, jokes, and real stories—this thread has it all.
Key Points
- •TrackHands is a cross-platform desktop app that detects when fingers approach the mouth and displays a warning overlay.
- •All processing is performed locally on-device; no data is collected or transmitted.
- •Installation is available via releases, with a macOS unsigned-app warning workaround using xattr; the app can also be built from source.
- •Features include real-time MediaPipe-based detection, system tray operation, adjustable detection speed and resolution, camera preview, and incident screenshots.
- •The tech stack includes React/TypeScript/Vite/Tailwind CSS on the frontend and Rust with Tauri 2.0 on the backend, using Zustand for state management.