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MacDown 3000 vs MacMD Viewer: catalog facts
MacDown 3000	MacMD Viewer
Free Free and open source.	Paid One-time purchase of $19.99 with a 14-day money-back guarantee.
macOS	macOS
Side-by-side live preview GitHub Flavored Markdown support	Quick Look previews of Markdown in Finder Renders Mermaid diagrams and tables
macOS only A focused editor without note organisation or sync	A viewer only, not an editor Requires macOS 14 or later
Downloadable app	Downloadable app
Open source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.