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D2

Languages Markup and templating

Learn D2 on your Mac

Official docs outline

Extra Credit builds an outline of D2's docs the first time your work uses it.

Learn D2 from your own work

Extra Credit reads your Claude Code sessions, finds the D2 concepts in the code your agents write, and quizzes you on them, measured against its official docs.

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Download for Mac

A macOS menu bar app for people who build with Claude Code.

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Docs outlines list section titles and link to each technology's official documentation, which belongs to its authors. Version and support data from endoflife.date and package registries. Logos from Simple Icons; trademarks belong to their owners.