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MacMD Viewer vs Shiba: catalog facts
MacMD Viewer	Shiba
Paid One-time purchase of $19.99 with a 14-day money-back guarantee.	Free Free and open source under the MIT licence.
macOS	Windows
Quick Look previews of Markdown in Finder Renders Mermaid diagrams and tables	Keyboard-centric navigation Live Markdown preview alongside any editor
A viewer only, not an editor Requires macOS 14 or later	Version 2 is still a work in progress No tagged releases on GitHub
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MIT
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 2, 2026

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