MuM

What it does

Your Markdown lives in a dozen folders. Most of the time you don't want to write — you just want to read one section. Every Markdown tool is a writing app with a preview pane. MuM is the opposite: a native macOS reader with no web engine inside — all AppKit. Several projects open at once, each remembering where you stopped. Cross-project search. Typesetting tuned for CJK as well as Latin. ~0.3s cold start, 1.7 MB download, 100+ fps scrolling a 5 MB document. Open source, MIT.

A reading-first Markdown engine. Fast, native — hand-built AppKit typesetting for reading, and CLI rendering for agents.

MuM is a Markdown engine built just for the Mac: hand-set typesetting in AppKit, tiny and blazing fast; multiple projects open in parallel with instant switching; and agents can call it directly to get rendered output or JSON data. Signed and notarized. Double-click to open — no Gatekeeper dance. outline / search / check emit stable JSON with classified exit codes (0/1/2/3/4) — agents never parsefrom mum.jiker.ai

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