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ReminDiary vs Diarium: catalog facts
ReminDiary	Diarium
Free Free and open source under the GPL 3.0 licence.	Freemium Free to start; Diarium Pro is a one-time purchase per platform.
Android	Windows, macOS, Android, iOS
Shows past entries from the same date after saving Fully offline with no account	No account needed to start Sync through your own OneDrive, Google Drive, Dropbox, iCloud or WebDAV
No sync between devices One entry per day only	Pro must be bought separately on each platform Closed source
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0-or-later	License not stated
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 24, 2026

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