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