Private Period TrackerUnderstand your body — and your privacy.
Guides to cycles, fertility, pregnancy and perimenopause, written in plain language — plus the questions worth asking about where your reproductive data really goes.
Why a period tracker should work completely offline
What "local-first" really means, and why keeping cycle data on your phone changes everything.
Read guide →Is your period app selling your data? How to check
The permissions, policies and red flags that tell you where your reproductive data really goes.
Read guide →How period predictions actually work
Cycle averages, fertile windows and why an honest app shows you a range, not a fake exact date.
Read guide →Your fertile window and ovulation, explained
When you're most fertile, the signs that pinpoint it, and how to track it privately while trying to conceive.
Read guide →Pregnancy week by week, privately
Baby development, size comparisons, body changes and trimester milestones — kept on your phone.
Read guide →Perimenopause: making sense of irregular cycles
Why cycles get unpredictable, what to track, and how a private app finds the pattern.
Read guide →On-device AI: an assistant that never phones home
What on-device AI means, why it matters for health privacy, and how it works entirely offline.
Read guide →Reading is good. Tracking privately is better.
Put it into practice with a period tracker that keeps everything on your phone — no account, no ads, no data sold.
Get it on Google Play