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MarkEdit vs MarkViewer: catalog facts
MarkEdit	MarkViewer
Free Free and open source under the MIT licence.	Free Free to download and use.
macOS	macOS
About 4 MB installed and fast on very large files Strict GFM support with no invented syntax	Native universal binary for Intel and Apple Silicon GitHub-flavored Markdown with automatic table of contents
macOS only Focused on Markdown rather than general note organisation	macOS only Not open source
Downloadable app	Downloadable app
Open source	Closed source
License: MIT	License not stated
No account 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 2, 2026

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