About

Period Tracker Free is a small, independent website. It helps you see when your next period and fertile window are likely, without handing your cycle data to anyone.

Why it’s built this way

Period data is personal. Many trackers need an account and keep your history on their servers, where it can be breached, sold, requested by authorities or kept longer than you’d like. This tracker runs entirely in your browser, and there’s no server storage for your data to end up in.

It also makes the site cheap to run, which is why it can stay free.

What we care about

Predictions are labelled as estimates, and if your cycles vary we show a range instead of one date. We never call any day “safe”. The methodology page explains every calculation. The tracker works with a keyboard and screen readers, in light and dark mode, and on paper if you print it.

Medical information

Our guides summarise public health information from sources such as the NHS and ACOG and link to them directly. They are general information, not medical advice. For anything about your own health, talk to a qualified clinician.