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ThiefMD vs iA Writer: catalog facts
ThiefMD	iA Writer
Free Free and open source under the GPL-3.0 or later licence.	Paid A paid purchase or subscription is required, depending on platform.
Linux	Windows, macOS, Android, iOS
Library is plain files on your own file system Export to PDF, ePub, docx and blog platforms via Pandoc	Syntax control highlights adjectives, conjunctions and filler words Plain Markdown files in your own folders, with no proprietary library
Linux only Developers note it comes with no guarantees against lost files	Paid on every platform, with separate purchases in places Deliberately few features; it is not an organiser or notebook
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 22, 2026

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