Posy is a simple, gorgeous period tracker that puts your privacy first. Track your cycle, predict future periods, log your mood and symptoms, and discover insights about your body — all without sharing a single byte of data.
Posy gives you powerful cycle tracking in a beautifully simple package.
See exactly where you are in your cycle with a beautiful, intuitive home screen. Know your current phase at a glance.
Predict your upcoming periods, fertile windows, and ovulation days up to 2 years ahead with smart cycle analysis.
Record your flow intensity, mood, and symptoms each day. Build a complete picture of your menstrual health over time.
Discover patterns with cycle variation charts, flow intensity history, and your most common symptoms over time.
Your data never leaves your device. No accounts, no servers, no tracking. Your body, your data, your business.
Designed with care to be the most intuitive and delightful period tracker you've ever used.
In a world where health apps sell your most intimate data, Posy takes a different approach. Your data stays on your device — period.
No accounts, no setup wizards, no endless questions. Just download and start tracking.
Get Posy for free from the App Store. No sign-up or account needed — just open and go.
Record your period start date, log daily flow, moods, and symptoms with a few simple taps.
Get predictions for future cycles and uncover patterns in your mood, symptoms, and cycle length.
Got questions? We've got answers. If there's something else on your mind, feel free to reach out.
Yes! Posy is completely free to download and use. There are no hidden fees, subscriptions, or in-app purchases. All features are available from day one.
All your data is stored locally on your device only. Posy has no servers, no cloud storage, and no way to access your information. Your health data never leaves your phone.
Posy uses your logged cycle history to calculate predictions. The more cycles you track, the more accurate your predictions become. Predictions include period dates, fertile windows, and ovulation estimates up to 2 years into the future.
You can log your period flow (spotting, light, medium, heavy), mood (happy, calm, sad, anxious, irritable, energetic, tired, sensitive), and physical symptoms (headache, backache, breast tenderness, fatigue, nausea, cramps, and more).
Yes! You can export your data anytime from Settings. Since all data is stored locally, we recommend backing up regularly. You can also import data from a previous backup if you switch devices.
Absolutely. Posy works 100% offline. Since there's no server communication, you never need an internet connection. Track your cycle anywhere, anytime.
Go to Settings > Delete All Data to permanently erase all your information from the app. Since your data is only stored on your device, deleting it is instant and irreversible — there are no server copies to worry about.
Posy is currently available on iOS (iPhone and iPad). An Android version is not available at this time, but stay tuned for future updates.
Beautiful, simple, and completely private. Your cycle tracker should respect your body and your data.
Download on the App StoreNo account required · iOS 15.1+