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Astro Editor vs MacDown 3000: catalog facts
Astro Editor	MacDown 3000
Free Free downloads from the project's GitHub releases.	Free Free and open source.
Windows, macOS, Linux	macOS
Frontmatter shown as forms built from Zod schemas Focus and typewriter modes for prose	Side-by-side live preview GitHub Flavored Markdown support
Only useful for Astro content collections Linux build is in beta	macOS only A focused editor without note organisation or sync
Downloadable app	Downloadable app
Closed source	Open 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.