Track her cycle. Period.

Period. is a private period tracker for partners. It shows a likely date range instead of pretending one predicted day is certain.

THREE WAYS TO LOG
• She told you: the strongest guide to when her period started.
• You saw it yourself: strong evidence, but the exact start may be less clear.
• You think so: a hunch can move the estimate, but never make it more certain.

A RANGE YOU CAN TRUST
See the next likely period as a band, with plain-language confidence. The range widens when the app has less evidence and becomes sharper as confirmed cycles are added.

MORE THAN THE NEXT PERIOD
View estimated ovulation, the fertile window, cycle phases, and a calendar that stays honest about uncertainty. These are estimates, not contraception or medical advice.

PRIVATE BY DESIGN
No account. No server. No analytics. No HealthKit. Everything stays on this iPhone. Lock the app with its own PIN and optional Face ID, export a readable copy, or delete everything at any time.

BUILT FOR RESPECT
Hand her the phone to show every item recorded about her. She can add her own date or remove the entire record immediately.

WIDGETS AND SHORTCUTS
Log an update from the Home Screen, Lock Screen, Control Center, Siri, or Shortcuts.

Period. helps you pay attention without pretending to know more than you do.