Short answer
A private cycle tracker should predict your period, fertile window and PMS phases, keep all data on device with no account, and avoid selling sensitive health information — accuracy plus privacy is the point.
Cyca is built for exactly this, with Private, No ads, On-device. Test it on a real example before relying on it, and check the current App Store listing for pricing.
What to look for before choosing
- Clear period, fertile-window and PMS predictions.
- All data stored on device, no account.
- No ads and no selling of health data.
- A calm, judgement-free design.
- Simple logging you'll actually keep up.
A practical decision process
- Log your last period start.
- Let Cyca map your phases.
- Check predictions for your fertile and gentle days.
- Log symptoms as you go.
- Keep everything private on device.
Quick comparison
| Need | What to check | Why it matters |
|---|---|---|
| Pricing model | Check whether useful features require a subscription, a one-time unlock, or neither. | The cheapest app on day one may not be cheapest after a year. |
| Privacy model | Prefer on-device work when the content is sensitive. | Private documents, resumes, study data, and family content deserve careful handling. |
| Export / lock-in | Confirm file formats, sharing, backup, and deletion controls. | A good app should help you finish the task, not trap your work. |
Where Cyca fits
Cyca fits when you want accurate cycle predictions without handing your health data to the cloud.
PrivateNo adsOn-device
This page is an independent buying guide. App Store features and prices can change, so confirm details on the listing before purchase.