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AquarellNotes vs OpenTodoList: catalog facts
AquarellNotes	OpenTodoList
Free Free and open source under the Apache 2.0 licence.	Free Free and open source under the GPL-3.0 licence.
Android	Windows, macOS, Linux, Android, iOS
Notes and shopping lists in one app No accounts, ads, analytics or tracking	Local-first with plain file-based storage Sync via Nextcloud, ownCloud, WebDAV or Dropbox
Early beta from a single developer No sync between devices	No hosted sync service of its own Simpler than dedicated task managers for complex projects
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: GPL-3.0-or-later
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 1, 2026

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