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Diarium vs Day One: catalog facts
Diarium	Day One
Freemium Free to start; Diarium Pro is a one-time purchase per platform.	Freemium Free to use, with extra features in the paid Gold plan.
Windows, macOS, Android, iOS	Windows, macOS, Android, iOS, Web, Browser extension
No account needed to start Sync through your own OneDrive, Google Drive, Dropbox, iCloud or WebDAV	Entries can include photos, video, audio and drawings End-to-end encrypted sync and data export
Pro must be bought separately on each platform Closed source	Some features require the paid Gold plan Closed source
Downloadable app	Downloadable app, Web application, Browser extension
Closed source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 24, 2026

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