Our always-on AI assistant detects and interrupts nail biting in milliseconds—building the lasting awareness you need to stop for good. Break the habit gently and grow healthy nails automatically while you work, browse, or focus on your screen.
Uses your computer's camera to detect nail biting the moment it happens, so the habit is interrupted immediately - not minutes later.
When nail biting is detected, the app alerts you right away (visual and/or sound), helping you notice the habit and stop it in the moment.
Designed to run while you use your computer - working, browsing the web, or watching videos. It focuses on the situations where nail biting most often happens.
No video is recorded. No images are saved. Nothing is uploaded or sent anywhere. All detection runs locally on your computer.
StopBitingNails does one thing: help you notice and stop nail biting. No accounts, no dashboards, no unnecessary features.
The entire codebase is open source, so anyone can see how it works. No hidden tracking, no surprises.
We digitized Habit Reversal Training (HRT)—the clinical gold standard for breaking repetitive habits.
Nail biting is an automatic, unconscious habit. Most people don't even realize they are doing it until it's too late.
Our AI acts as a digital coach that never blinks. It detects hand-to-mouth movements in milliseconds, filling the gap where your awareness fails.
HRT works by interrupting the "loop" with a Competing Response. The app alerts you instantly, forcing your brain out of autopilot and back into conscious control.
Consistent interruption creates new neural pathways. Within weeks, your brain rewires itself to keep your hands down by default.
Most nail-biting solutions fail because the habit is automatic. This app interrupts it in the moment - while you're on your computer.
It sounds simple, but in real life it's messy and easy to outgrow. You have to reapply it constantly because it wears off. The bitterness transfers to finger foods and can ruin meals. And many people eventually get used to the taste and keep biting anyway.
Streaks are motivating after you've stopped - but nail biting often happens before you notice. By the time you log it, the bite already happened. Tracking helps with reflection, but it doesn't reliably stop the behavior in the moment.
Some devices try to "punish" the habit with vibration or electric shock. They can be expensive, uncomfortable, and have a mixed reputation - plus many people don't want to wear hardware all day.
They can reduce nail biting for some people, but they're not for everyone, can be costly/maintenance-heavy, and don't solve related behaviors like biting the skin around the nails.
Nail biting is often compulsive. The only thing that reliably helps is awareness at the exact moment it happens. That's also why habit-reversal approaches work well - because they focus on recognizing and interrupting the behavior in real time.
StopBitingNails does that automatically while you're at your computer:
This app is effective at interrupting nail biting while you're using your computer - working, browsing, watching YouTube - because it can catch the behavior and react instantly.
But it can't help in situations where your computer isn't involved (driving, reading a book, walking, etc.). It's a focused tool for the place many people bite their nails the most: at the computer.
Start free in your browser, or get the full desktop experience.
💡 Tip: Try the free browser version first to see if it works for you!
Download the lightweight desktop app to build awareness in real-time.
Everything you need to know about the privacy and tech behind the app.
100%. The app uses **Local AI Processing**, meaning your camera feed never leaves your computer. No images or videos are ever recorded, stored, or transmitted to a server. Our open-source code on GitHub allows anyone to verify this privacy claim.
When the AI detects your hand approaching your mouth, it triggers a subtle audio cue or a system notification. This "Micro-Intervention" is designed to bring your subconscious habit into your conscious awareness so you can stop.
The app is highly optimized for background use. It consumes minimal CPU resources (similar to having a single browser tab open) and is designed to run silently while you work, attend meetings, or watch videos.
Yes. The machine learning model is trained to recognize hand movements regardless of whether you wear glasses or headphones. It works best in standard room lighting but can struggle in near-total darkness.
We love community contributions. Visit our GitHub repository to open an issue, suggest a feature, or submit a pull request.
We do not offer refunds for purchases. Because StopBitingNails is a digital product that provides immediate and full access upon purchase, the value is delivered instantly and cannot be "returned" like a physical item. Additionally, we offer a completely free version of the app—both in-browser and as a downloadable desktop app—so you can fully test the core functionality before deciding to buy. We encourage everyone to try the free version first to make sure it works for your needs.