Contact

Found a bug, a wrong date or something confusing? Let us know.

Updated 25 Sept 2026

Please don’t send health details. We don’t need your period dates to look into a problem. Just describe what you did and what looked wrong, for example “28-day cycle, the fertile window showed on the wrong days”.

There’s no contact form on purpose. It means the site has no way to collect personal information.

For medical questions, please contact a doctor, nurse, pharmacist or your local health service. We can’t give individual medical advice.