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Lotti vs Diarium: catalog facts
Lotti	Diarium
Free Free and open source under the GPL-3.0.	Freemium Free to start; Diarium Pro is a one-time purchase per platform.
macOS, Linux, Android, iOS	Windows, macOS, Android, iOS
End-to-end encrypted sync between your own devices AI suggestions require your approval	No account needed to start Sync through your own OneDrive, Google Drive, Dropbox, iCloud or WebDAV
AI agent workflow may be more than a simple journal user needs Cloud AI features depend on external model providers	Pro must be bought separately on each platform Closed source
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0-only	License not stated
Not stated if an account is needed	No account needed
Not stated if it 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 24, 2026

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