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Penzu vs Diarium: catalog facts
Penzu	Diarium
Free Free to start, with unlimited entries at no cost.	Freemium Free to start; Diarium Pro is a one-time purchase per platform.
Android, iOS, Web	Windows, macOS, Android, iOS
Unlimited entries on the free plan Encryption and per-entry or per-journal locking	No account needed to start Sync through your own OneDrive, Google Drive, Dropbox, iCloud or WebDAV
Journals are stored on Penzu's service rather than in files you own Built for journaling, not general note-taking	Pro must be bought separately on each platform Closed source
Downloadable app, Web application, Hosted service	Downloadable app
Closed source	Closed source
License not stated	License not stated
Account needed	No account needed
Not stated if it 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.