607 Japanese sites, distilled into prompts an AI can actually typeset

What it does It’s a curated library of DESIGN.md files — plain-Markdown design specs in the format Google Stitch proposed, meant to sit next to AGENTS.md in your repo — one per Japanese web service. Drop one in and your AI coding agent gets the look-and-feel rules instead of guessing. The existing awesome-design-md covers 55+ Western services but, as the README bluntly puts it, completely lacks Japanese typography specs.

The interesting bit The value isn’t the brand list; it’s the CJK typography rules baked into each spec: Japanese-first font fallback chains, line-height of 1.5–2.0 (vs. Latin’s 1.4–1.5), 0.04–0.1em letter-spacing, kinsoku line-breaking rules, OpenType features like palt and kern, and mixed Japanese/Latin composition. These are exactly the details an LLM silently gets wrong.

Key highlights

• 607 sites covered, from Mercari and LINE to Nintendo, MUJI, and Japan’s Digital Agency
• Each entry ships with a preview.html visualizing its design tokens, plus a hosted gallery
• Extends the Stitch DESIGN.md format rather than inventing a new one
• Bilingual README (Japanese and English)

Caveats

• It’s a content collection, not tooling — no automation beyond the preview pages
• The README doesn’t explain how each spec was derived (hand-curated vs. scraped), so accuracy per site is unverified

Verdict Anyone building Japanese UI with AI agents should bookmark this immediately. If you never typeset Japanese, it’s still a neat reference for what CJK-aware design specs look like — but not much more.