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