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Diary vs Day One: catalog facts
Diary	Day One
Free Free and open source under the GPL-3.0 licence.	Freemium Free to use, with extra features in the paid Gold plan.
Android	Windows, macOS, Android, iOS, Web, Browser extension
Entries saved as plain text files with Markdown Incremental and full search across entries	Entries can include photos, video, audio and drawings End-to-end encrypted sync and data export
Android only No built-in sync between devices	Some features require the paid Gold plan Closed source
Downloadable app	Downloadable app, Web application, Browser extension
Open source	Closed source
License: GPL-3.0	License not stated
Not stated if an account is needed	Not stated if an account is 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.