QuietCycle: private period tracker

About this app

What QuietCycle does

QuietCycle is the period and fertility tracker that physically cannot leak your data — because it has no account, no analytics, and no network capability at all. Everything lives on this iPhone. This matters now more than ever. Flo settled with the FTC for sharing sensitive cycle and fertility data with Facebook, Google, and analytics firms. Post-Dobbs, privacy advocates have warned that reproductive-health-app data could be subpoenaed. Flo, Glow, and Ovia are all cloud-account apps; their privacy fixes are patches on a fundamentally networked architecture. QuietCycle is built differently from the first line of code. What QuietCycle does: — Log your cycle in seconds. Period start/end, flow, symptoms, mood, cervical mucus, basal body temperature. A clean calendar shows your history. — Fertile-window estimate. Calendar and temperature method, computed on-device. Clearly labeled as an estimate, not contraception. — Optional HealthKit. If you choose, QuietCycle reads and writes Apple Health's local menstrual-cycle store — which itself never leaves your devices. — Cycle insights. Average cycle length, period length, variability — charted on-device. — No account. No email. No cloud. No network entitlement. The app literally cannot transmit your data anywhere. — Optional passcode + Face ID lock on the whole app. For the tens of millions of US menstruating adults who want to track their cycle without becoming a data point in a court case or an ad profile.