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ThiefMD vs Ulysses: catalog facts
ThiefMD	Ulysses
Free Free and open source under the GPL-3.0 or later licence.	Paid Paid app with a free trial on all devices.
Linux	macOS, iOS
Library is plain files on your own file system Export to PDF, ePub, docx and blog platforms via Pandoc	Distraction-free editor for long-form writing Library for organizing large writing projects
Linux only Developers note it comes with no guarantees against lost files	Apple platforms only Paid after the trial
Downloadable app	Downloadable app
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 September 23, 2026

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