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ImapNotes3 vs Simple Notes Sync: catalog facts
ImapNotes3	Simple Notes Sync
Free Free and open source under the GPL-3.0.	Free Free and open source under the AGPL 3.0 licence.
Android	Android
Syncs through any IMAP mailbox you already have Notes stored as standard HTML emails	Works fully offline Sync to your own WebDAV server
Needs an email account with IMAP access Android only	Android only Sync requires running your own server
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: AGPL-3.0-only
Account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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