Nailwell: Break nail biting with science-backed HRT

Hey Product Hunt! 👋 I'm the founder of Nailwell and I built it because I was a chronic nail biter for 10+ years. I tried willpower. I tried bitter nail polish. I tried those "just stop" tips. Nothing worked. Then I discovered Habit Reversal Training (HRT) — a form of cognitive behavioral therapy specifically designed for body-focused repetitive behaviors. Clinical studies show 80%+ success rates. The problem? HRT programs cost $200+/session with therapists, and there wasn't a good self-guided app. So I built one. Nailwell features: Photo Progress Tracking - Before/after comparison with overlay blending. Watch your nails transform over 90 days. 12-Week HRT Program - Evidence-based curriculum covering awareness training, competing responses, and maintenance strategies. Gamification That Works - XP, levels, 15+ badges, daily streaks, and challenges. Psychology shows gamification increases habit change success by 30%. Pattern Recognition - Log triggers, moods, and urges. See when and why you bite with visual analytics. Money Saved Tracker - See how much you're saving on nail repairs and treatments. 100% Private - No account. No cloud. No tracking. Everything stays on YOUR device. I'd love your feedback - what features would make this even more useful? And if you've struggled with nail biting, I'd love to hear your story. Thanks for checking out Nailwell! 🙏