Curio is a design style library for AI agents. Pick a style and give your AI its DESIGN.md spec, which covers color, type, spacing and motion. Access styles by paste-a-link or through an MCP connection. It works with Claude, ChatGPT, Gemini, DeepSeek, Kimi and others. The site is web based, in English and Chinese.
The page says previews are free. Credits are sold in packs: 10 for $4.90, 100 for $19.90 and 1,000 for $99.90. It is a one-time purchase with no subscription, and credits never expire. Once a style is unlocked, downloads and shares cost nothing more.
Curio aims to put good design within reach of people building with AI, by making established design styles reusable as machine-readable specifications instead of describing a look from scratch each time.