$30K/month founder reveals exactly what is inside his AI peptide app

Cedric is a college student who built PepAI and hit $50K in revenue in 7 weeks. $11K MRR, ~2,000 active subs, $10/mo or $45/yr with a 3-day trial. The stack is dead simple: Repl.it + Claude to vibe code the whole thing in ~2 weeks Firebase for backend + user data RevenueCat for in-app subscriptions Resend for email PubMed sources powering the research library Apple Health for the lifestyle + tracking layer The real edge wasn’t the tech. It was spotting peptides trending on TikTok before anyone shipped a serious app for it, then moving fast.