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