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Open Notes vs Markor: catalog facts
Open Notes	Markor
Free Free and open source under GPL-3.0-only.	Free Free and open source.
Android	Android
Markdown formatting and image support Reminders and home screen widgets	Edits Markdown, todo.txt and Zim files directly Simple and lightweight
Android only	Android only No built-in sync service
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-only	License not stated
Not stated if an account is needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked September 23, 2026

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