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ReminDiary vs SimpleDay: catalog facts
ReminDiary	SimpleDay
Free Free and open source under the GPL 3.0 licence.	Free Free and open source under the GPL-3.0 license.
Android	Android
Shows past entries from the same date after saving Fully offline with no account	Markdown entries No account needed
No sync between devices One entry per day only	Limited to one entry per day by design Young project with a single developer
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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