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MarkViewer vs Clearance: catalog facts
MarkViewer	Clearance
Free Free to download and use.	Free Free download from the project's GitHub Releases page.
macOS	macOS
Native universal binary for Intel and Apple Silicon GitHub-flavored Markdown with automatic table of contents	Native Swift app rather than a web wrapper Handles YAML frontmatter documents
macOS only Not open source	macOS only for now; other platforms are planned Small, young project
Downloadable app	Downloadable app
Closed source	Closed 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.