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