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Astro Editor vs Apostrophe: catalog facts
Astro Editor	Apostrophe
Free Free downloads from the project's GitHub releases.	Free Free and open source under the GPL-3.0-or-later licence.
Windows, macOS, Linux	Linux
Frontmatter shown as forms built from Zod schemas Focus and typewriter modes for prose	Focus mode for distraction-free writing Live rendered preview
Only useful for Astro content collections Linux build is in beta	Linux only Edits single files rather than managing a notes library
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0-or-later
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.