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Zettlr vs ThiefMD: catalog facts
Zettlr	ThiefMD
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.	Library is plain files on your own file system Export to PDF, ePub, docx and blog platforms via Pandoc
Some publication formats require additional export dependencies.	Linux only Developers note it comes with no guarantees against lost files
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.