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MacMD Viewer vs Marked 3: catalog facts
MacMD Viewer	Marked 3
Paid One-time purchase of $19.99 with a 14-day money-back guarantee.	Paid Paid app with a free trial, also available on the Mac App Store and Setapp.
macOS	macOS
Quick Look previews of Markdown in Finder Renders Mermaid diagrams and tables	Live preview that works alongside any text editor Proofreading tools beyond a plain preview
A viewer only, not an editor Requires macOS 14 or later	Mac only, requires macOS 11 or newer Previews and exports rather than edits text
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License: Proprietary
Not stated if an account is needed	Not stated if an account is needed
Works offline	Not stated if it 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.