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Libellus Potionis vs Journal Multilingual: catalog facts
Libellus Potionis	Journal Multilingual
Free Free and open source under GPL-3.0-or-later.	Free The F-Droid build is free and open source under GPL-3.0-only; the Google Play version may…
Android, iOS	Android
Tracks daily and rolling weekly limits Estimates blood alcohol concentration	Substance interaction checker and timeline Information on more than 100 substances
Available for Android 11 or newer and iOS 17 or newer. Blood alcohol concentration is estimated using the Widmark formula.	Android only
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0-only
Not stated if an account is needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 8, 2026

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