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Iotas vs EteSync-Knotes: catalog facts
Iotas	EteSync-Knotes
Free Free and open source under the GPL-3.0 or later.	Free The application is free; EteSync hosting is paid, or you can run your own instance.
Linux	Linux
Fast Nextcloud Notes sync with offline editing Optional Markdown with a formatted view and task lists	Works with notes from the EteSync mobile app Supports multiple accounts and notebooks
Notes are stored in SQLite, not plain files Export to PDF, ODT and HTML is still in preview	Requires an EteSync account Linux only
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0-only
No account needed	Account 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 October 8, 2026

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