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drip vs Luteal: catalog facts
drip	Luteal
Free Free and open source.	Free Free and open source under GPL-3.0-or-later.
Android, iOS	Android
All data stays on the device Supports the symptothermal method for fertility awareness	Labels recorded observations separately from estimates Tracks symptoms and basal body temperature
No sync between devices Fertility features depend on careful manual tracking	Android only. Predictions are estimates; the app makes no diagnosis.
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0-or-later
Not stated if an account is needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 8, 2026

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