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Diarium vs Diary: catalog facts
Diarium	Diary
Freemium Free to start; Diarium Pro is a one-time purchase per platform.	Free Free and open source under the GPL-3.0 licence.
Windows, macOS, Android, iOS	Android
No account needed to start Sync through your own OneDrive, Google Drive, Dropbox, iCloud or WebDAV	Entries saved as plain text files with Markdown Incremental and full search across entries
Pro must be bought separately on each platform Closed source	Android only No built-in sync between devices
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
No account needed	Not stated if an account is needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 2, 2026

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