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MacDown 3000 vs MarkEdit: catalog facts
MacDown 3000	MarkEdit
Free Free and open source.	Free Free and open source under the MIT licence.
macOS	macOS
Side-by-side live preview GitHub Flavored Markdown support	About 4 MB installed and fast on very large files Strict GFM support with no invented syntax
macOS only A focused editor without note organisation or sync	macOS only Focused on Markdown rather than general note organisation
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: MIT
No account 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 1, 2026

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