Periodical

A menstrual calender with calculation of fertile days according to Knaus-Ogino.GPL-3.0-or-later

drip period & cycle tracker

Open-source, non-commercial and leaves your data on your phone.GPL-3.0-only

Bluemoon

Open source, privacy friendly menstruation tracking app. Your period, your data!GPL-3.0-or-later

Noor Connect

Premium privacy-first Islamic companion: Quran, Qibla, Adhan, & Habit tracking.GPL-3.0-only

Luteal

Private, offline-first cycle tracker separating facts from estimates.GPL-3.0-or-later

Mooneva Cycle – Period Tracker

Private period & cycle tracker. Offline, encrypted, no account, no ads.GPL-3.0-only

Mensinator

Tailored Period Tracking, Total Privacy—Your Period, Your Control.MIT