How do I choose a period tracker app?

Where is my data stored?

Look for an app that keeps your logs on your phone, or tells you plainly what is sent elsewhere. Check the privacy labels in the App Store listing, and whether ads or third-party trackers are used. Cycle data is personal, so it’s reasonable to be strict.

Do I need an account?

An app that works without an account keeps you in control. Signing in is useful if it backs your cycle up so it can move to a new phone, but it should be optional.

How does it show predictions?

Cycles move by a few days, so a range of dates is more honest than a single date. Look for an app that gets closer as you log, and that widens the window if your cycles are irregular or you have PCOS.

Can I export my data?

You should be able to take your history with you, and ideally to share a summary with a doctor. Importing from another app saves you starting over.

Does it say it isn’t birth control?

A tracker shows estimates. It should say clearly that it is not a medical device and not a form of birth control.

Seventh is built around these answers: your logs are stored on your phone, no account is needed (signing in is optional and backs your cycle up), predictions are a range, and you can export everything or a doctor summary. It’s free, with no ads.