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