Compare software

Luteal vs Clue: catalog facts
Luteal	Clue
Free Free and open source under GPL-3.0-or-later.	Freemium Free app with a paid subscription for additional features.
Android	Android, iOS
Labels recorded observations separately from estimates Tracks symptoms and basal body temperature	Cycle predictions and personalised insights Available on both iOS and Android
Android only. Predictions are estimates; the app makes no diagnosis.	Some features require a subscription Sensitive health data is handled by a commercial service
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0-or-later	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 8, 2026	Official website Full listing and sources Checked September 23, 2026

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