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Period Calendar is a period tracker and ovulation tracker in one — predict your period, ovulation and fertile window, and track your chance of getting pregnant.
By Hafiz Rahman
Editor, tools and utilities
Period Calendar is a period and ovulation tracker for people who want to follow their menstrual cycle day by day. The listing pitches it at two groups: people trying to conceive and people using birth control. It also says it works for both regular and irregular cycles.
Most of the app is a calendar with a diary attached. You log what happens each day, and the app uses those entries to predict your next period, your ovulation day and your fertile window.
The build we hold is Period Calendar Period Tracker 1.78.367.GP (APK) for Android 6.0 and up.
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The app predicts the next period and ovulation date, and it includes a period calculator, an ovulation calculator and a fertility calculator. The listing says the predictions can be adjusted with an ovulation test result, so a positive or negative test day feeds into the forecast.
For each day, the app shows an estimated chance of conception. The listing presents this as a way to plan around fertile days, whether the goal is pregnancy or avoiding it.
Each day you can record menstrual flow, cervical mucus, cervical firmness and cervical opening, which the listing names as fertility signs. You can also log BMI, weight, sexual activity, symptoms, mood and body temperature.
Temperature entries feed a basal body temperature chart, which the listing says helps locate ovulation. Notes can be searched through a timeline view, and the app supports multiple accounts, so more than one person's cycle can be tracked on one device.
The reminder system covers period, fertility and ovulation alerts, plus reminders for contraceptive pills. The pill reminder covers pills as well as rings, patches and injections.
The notification text can be customized, so an alert can read as something neutral. The listing also says the Wear OS version adds period, ovulation, water and pill reminders through watch complications and tiles.
No account or real-name registration is needed to use the features, according to the listing. Backup and restore runs through a Google account, and the developer says data is synced in encrypted form and can also be sent to a phone or email.
The developer states that all data can be deleted with one action and that it does not collect or store user data. The listing describes the app as free to use.