StyleSeed - Design engine to stop AI agents from building generic UI

Show HN: StyleSeed – a design-rules engine so AI agents stop building generic UI

StyleSeed is a design-rules engine that teaches AI agents like Claude Code, Codex, and Cursor design judgment instead of just data. It solves the problem of AI-generated interfaces looking generic by enforcing 74 specific design rules, 48 components, and 7 brand skins including Toss, Stripe, and Linear. With a built-in Quality Gate that scores and fixes UI before you see it, StyleSeed ensures coherent, professional designs that prevent style drift across sessions. It integrates seamlessly via markdown files or optional skills to transform vibe coding into polished product experiences.

"Your AI writes UI that looks like an AI wrote it. StyleSeed is the design engine that fixes that."