Compare software

Clue vs Euki: catalog facts
Clue	Euki
Best for: People who want to track their menstrual cycle on their phone	Best for: People seeking a private period tracker with reproductive health resources
Free + paid options Free app with a paid subscription for additional features.	Free Free to use with no paywalls, supported by donations.
Android, iOS	Android, iOS
Cycle predictions and personalised insights Available on both iOS and Android All 3 strengths for Clue Cycle predictions and personalised insights Available on both iOS and Android Science-based approach to content	Period and pregnancy tracking Available in English and Spanish All 3 strengths for Euki Period and pregnancy tracking Available in English and Spanish No paywalls or third-party tracking
Some features require a subscription Sensitive health data is handled by a commercial service	Available for Android and iOS
Downloadable app	Downloadable app
Not open source	Open source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Sources for Clue helloclue.com play.google.com/store/apps/details apps.apple.com/us/app/clue-period-cycle-tracker/id657189652 Catalog checked September 23, 2026	Official website Full listing and sources Sources for Euki eukiapp.org Catalog checked October 8, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.