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MarkViewer vs MacDown 3000: catalog facts
MarkViewer	MacDown 3000
Free Free to download and use.	Free Free and open source.
macOS	macOS
Native universal binary for Intel and Apple Silicon GitHub-flavored Markdown with automatic table of contents	Side-by-side live preview GitHub Flavored Markdown support
macOS only Not open source	macOS only A focused editor without note organisation or sync
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 1, 2026

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