Cycle estimate, score, and privacy

How HerPhase Works

HerPhase uses your last period start date, usual cycle length, and optional daily check-ins to estimate where you are in your cycle and help you plan your day.

Cycle Estimate

The app calculates the number of days since your last period start, wraps that number across your selected cycle length, and maps the day into estimated Menstrual, Follicular, Ovulation, or Luteal phases.

Phase Score

The score begins with a phase baseline. Your check-in can adjust it using sleep quality, stress, and energy. The final score is capped from 0 to 100.

Insights

Insights use recent check-ins to show general wellness patterns. They are not medical predictions, diagnoses, contraception, or fertility guidance.

Privacy

In the free-first version, HerPhase stores data locally on your device and does not use accounts, cloud sync, analytics, or tracking.