Euki

eukiapp.org

A nonprofit tracker from Women Help Women: free, with no accounts, no advertising and no analytics. Everything logged stays on the phone. There is a passcode, an instant wipe and a timer that deletes entries automatically. Beyond periods and symptoms, Euki carries vetted information on contraception, abortion, miscarriage and aftercare, in English and Spanish.

The obvious pick for people whose first question is who else can read their cycle data, including anyone in a jurisdiction where reproductive health records carry legal risk. The price of that position: no cloud backup, so a lost phone means lost history, and predictions stay basic next to algorithm heavy competitors.

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