Stub Out is a quit-nicotine app that turns the challenge of stopping into a game. Designed for people quitting cigarettes, vaping, or nicotine pouches, it personifies cravings as Nik, a customizable villain who gradually falls apart as users resist urges and build a streak. Users can focus on one habit or tackle all three with a shared progress clock.

The app combines motivational tools with practical tracking. A home-screen widget shows progress, savings, and avoided nicotine use, while a live AI coach offers support during cravings and draws on users’ streaks and reasons for quitting. Craving tools include tapping Nik and guided breathing. Users can set savings goals, collect milestone badges, track recovery milestones, and explore insights into mood, craving patterns, and triggers. Their personal reasons for quitting can also appear as encouragement when urges arise, and AI-written roasts give Nik a fresh, personalized voice.

Users can choose an enemy type and Nik’s personality, which shapes his taunts and reactions throughout the journey.