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MacMD Viewer vs Clearance: catalog facts
MacMD Viewer	Clearance
Paid One-time purchase of $19.99 with a 14-day money-back guarantee.	Free Free download from the project's GitHub Releases page.
macOS	macOS
Quick Look previews of Markdown in Finder Renders Mermaid diagrams and tables	Native Swift app rather than a web wrapper Handles YAML frontmatter documents
A viewer only, not an editor Requires macOS 14 or later	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
Not stated if an account is 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 1, 2026

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