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MacDown 3000 vs Astro Editor: catalog facts
MacDown 3000	Astro Editor
Free Free and open source.	Free Free downloads from the project's GitHub releases.
macOS	Windows, macOS, Linux
Side-by-side live preview GitHub Flavored Markdown support	Frontmatter shown as forms built from Zod schemas Focus and typewriter modes for prose
macOS only A focused editor without note organisation or sync	Only useful for Astro content collections Linux build is in beta
Downloadable app	Downloadable app
Open source	Closed source
License not stated	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.