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Markdown Preview vs Marked 3: catalog facts
Markdown Preview	Marked 3
Free Free and open source.	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 Document outline for long files	Live preview that works alongside any text editor Proofreading tools beyond a plain preview
A reader, not an editor macOS only	Mac only, requires macOS 11 or newer Previews and exports rather than edits text
Downloadable app	Downloadable app
Open source	Closed source
License not stated	License: Proprietary
No account needed	Not stated if an account is needed
Not stated if it 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.