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Apostrophe vs iA Writer: catalog facts
Apostrophe	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
Focus mode for distraction-free writing Live rendered preview	Syntax control highlights adjectives, conjunctions and filler words Plain Markdown files in your own folders, with no proprietary library
Linux only Edits single files rather than managing a notes library	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.