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Learn J on your Mac

Official docs outline

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

Learn J from your own work

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

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

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JCL

Lessons and quizzes from the code your agents write, for macOS.

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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.