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Marked 3 vs MacDown 3000: catalog facts
Marked 3	MacDown 3000
Paid Paid app with a free trial, also available on the Mac App Store and Setapp.	Free Free and open source.
macOS	macOS
Live preview that works alongside any text editor Proofreading tools beyond a plain preview	Side-by-side live preview GitHub Flavored Markdown support
Mac only, requires macOS 11 or newer Previews and exports rather than edits text	macOS only A focused editor without note organisation or sync
Downloadable app	Downloadable app
Closed source	Open source
License: Proprietary	License not stated
Not stated if an account is needed	No account 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.