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Apostrophe vs Calmly Writer: catalog facts
Apostrophe	Calmly Writer
Free Free and open source under the GPL-3.0-or-later licence.	Paid Pay-once license with a 14-day trial.
Linux	Windows, macOS, Linux, Android, Web
Focus mode for distraction-free writing Live rendered preview	Markdown shown as formatted text Word count targets and reading time
Linux only Edits single files rather than managing a notes library	Paid after the trial Few layout options by design
Downloadable app	Downloadable app, Web application
Open source	Closed source
License: GPL-3.0-or-later	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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