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ThiefMD vs Apostrophe: catalog facts
ThiefMD	Apostrophe
Free Free and open source under the GPL-3.0 or later licence.	Free Free and open source under the GPL-3.0-or-later licence.
Linux	Linux
Library is plain files on your own file system Export to PDF, ePub, docx and blog platforms via Pandoc	Focus mode for distraction-free writing Live rendered preview
Linux only Developers note it comes with no guarantees against lost files	Linux only Edits single files rather than managing a notes library
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0-or-later
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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