Meet QuietCycle — Cycle tracking that can't leak

Health And Fitness

QuietCycle

Cycle tracking that can't leak.

Every feature, from the first launch.

No account, no login, no cloud. Everything runs on your device and works fully offline — nothing in this post is hidden behind a wall.

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.

A look inside

Tap any screenshot to open the full-resolution version.

What's inside

Calendar — Cycle history at a glance; tap a day to log
Log day — Flow, symptoms, mood, cervical mucus, BBT
Fertile window — On-device estimate, clearly labeled non-contraceptive
Insights — Avg cycle/period length + variability (Swift Charts)
Privacy lock — Face ID / passcode lock; explains no-network design

Why we built it

People want to track their cycle and fertility but the dominant apps (Flo, Glow, Ovia) are cloud-account-based; Flo settled with the FTC for sharing sensitive data with Facebook/Google, and post-Dobbs that data could be subpoenaed.

What makes it different

QuietCycle is the only cycle tracker that ships with no network entitlement at all (it physically cannot transmit data), no account, and optional local-only HealthKit integration — Flo settled with the FTC for sharing data with Facebook/Google and bolted on a reactive 'anonymous mode,' Glow collects sexual-activity +…

Who it's for

Anyone who wants honest tracking without a coach, a subscription, or a streak guilting them at 11pm.

In one line: Cycle tracking that can't leak.

Try it

See the QuietCycle app page for the full feature list, the info table, and support links.

Use QuietCycle, found a bug, or have a feature request? Comments are open below — anonymous is fine.