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Euki vs Luteal: catalog facts
Euki	Luteal
Free Free to use with no paywalls, supported by donations.	Free Free and open source under GPL-3.0-or-later.
Android, iOS	Android
Period and pregnancy tracking Available in English and Spanish	Labels recorded observations separately from estimates Tracks symptoms and basal body temperature
Available for Android and iOS	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
Not stated if it 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.