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Zettlr vs Apostrophe: catalog facts
Zettlr	Apostrophe
Free The open-source software is available without a license fee. Hosting, hardware and…	Free Free and open source under the GPL-3.0-or-later licence.
Windows, macOS, Linux	Linux
Combines document navigation with flexible export workflows.	Focus mode for distraction-free writing Live rendered preview
Some publication formats require additional export dependencies.	Linux only Edits single files rather than managing a notes library
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	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 September 22, 2026	Official website Full listing and sources Checked October 1, 2026

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