How David Built a $14K/Month App Helping People Quit Sugar

David Atas, a former quant trader with a CS background, built Stopper — a sugar-quitting app — in two weeks using Flutter, Firebase, and AI-assisted vibe coding with Cursor. The app reached $14K MRR within five months. Key insights include: taking inspiration from an existing app in a different niche, building a psychologically optimized 40-screen onboarding flow, using influencer marketing on TikTok and Instagram to drive early downloads, and tracking every user action with Mixpanel and Firebase. David also discusses his tiered paywall strategy with A/B testing, re-engagement push notifications and emails for trial cancelers, and his new AI-generated content strategy using Sora to scale TikTok distribution.