DESIGNmd is a free library of DESIGN.md files - a new markdown format by Google that captures complete design systems (colors, typography, spacing, components) in a single file. Drop one in your project and any AI coding tool - Cursor, Claude Code, Codex, Antigravity - builds consistent UI from it. Browse by style, color, or tags. Download with one click, or pull directly into your editor using the MCP server or CLI.