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Builder Brief scans Reddit, Hacker News, and indie founder newsletters every few hours and turns recurring complaints into structured, evidence-backed problem briefs. Each one includes a Builder Score, 1-5 validation evidence (from paying users to venting), competitor analysis, monetization shape, and a paste-ready AI prompt for tools like Claude Code or Cursor. Browse 1,800+ briefs free. First download free, $4.99 per brief after. Built for the upstream problem: knowing what's worth building.