BriefKit generates a 14-file engineer-grade specification pack for SaaS founders using AI build tools. Fill a form, get a complete brief: database schema with columns and types, RLS security policies (copy-paste SQL), auth state machine, role-based access control, 8 screen briefs, email templates, deployment checklist, and test cases. Paste into Lovable, Cursor, or Claude Code — cuts iterations from 200+ to ~19. Built by a founder who burned $100 and 200+ iterations before figuring out the spec was the missing piece.