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MarkViewer vs Markdown Preview: catalog facts
MarkViewer	Markdown Preview
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	Quick Look previews of Markdown in Finder Document outline for long files
macOS only Not open source	A reader, not an editor macOS only
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License not stated
No account needed	No account needed
Works offline	Not stated if it 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.