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

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