I Built an AI Tattoo App with Expo — Here’s Everything I Learned

A developer shares lessons learned from building and launching an AI tattoo try-on app using Expo, React Native, and Google Gemini's image generation API. The post covers the full tech stack (Expo Router, Expo UI, BetterAuth, Prisma, RevenueCat, EAS hosting), UI/UX polish tips like haptics and real-device testing, App Store submission pitfalls including Apple's authentication guidelines, and marketing strategies such as Reddit ads, Apple Search Ads, and social media. The app reached 356 users and $15 MRR shortly after launch.