Period Calendar Period Tracker

Period Calendar Period Tracker is a health and fitness app by Simple Design Ltd. that helps users monitor menstrual cycles, predict ovulation, and track fertility. It serves as a comprehensive period diary, allowing women to log daily symptoms, moods, flow intensity, and other health metrics. The app is designed to assist both those trying to conceive and those seeking natural birth control methods, offering daily pregnancy probability estimates based on tracked data. With a rating of 4.89 from over 4.8 million ratings and more than 100 million installs, it has become a widely used tool in the health tracking space. The app has been available since March 2012 and was last updated in September 2026, with the most recent version being 1.77.355.GP released in October 2026. The latest update brought a significant overhaul to the Pregnancy Mode, introducing week-by-week fetal size visualizations and enhanced pregnancy tracking accuracy. The app also supports Wear OS complications and tiles, providing period and ovulation predictions, water drinking reminders, and pill reminders directly on compatible smartwatches. Data privacy is emphasized, with options for anonymous use, no account creation, and the ability to back up data via Google account or email. The app includes ads and offers in-app purchases, but core functionality remains free to use.

Key features

• Period and ovulation prediction with calculators for menstrual cycles, fertile windows, and conception probability
• Daily tracking of blood flow, cervical mucus, body temperature, weight, BMI, sexual activity, symptoms, and moods
• Customizable pill reminders for contraceptives, including pills, rings, patches, and injections, with discreet notification text
• Fertile symptom tracking, such as cervical firmness and opening, to aid in family planning
• Pregnancy Mode with week-by-week fetal size visualization and personalized pregnancy insights
• Multi-account support with security protections and a searchable timeline for all notes
• Data backup and restoration via Google account or email, with encrypted synchronization and one-click data deletion
• Wear OS complications and tiles for quick access to period predictions, water reminders, and pill alerts

How to install

1. Tap the download button on this page to get the APK file (59 MB).
2. When prompted, allow your browser or file manager to install apps by enabling the 'Install unknown apps' setting in your device's security options.
3. Open the downloaded APK file from your notifications or file manager.
4. Tap Install and wait for the installation to complete. The app requires Android 6.0 or higher.
5. Once installed, open the app from your app drawer and begin setting up your profile and tracking preferences.

What's New

The latest update, released on September 10, 2026, brings a significant upgrade to Pregnancy Mode. You can now watch your baby's size grow week by week and get a clearer picture of what to expect for both you and your little one throughout your pregnancy. This enhanced experience delivers a smoother and more accurate pregnancy tracker to support you every step of the way.

This app is ideal for women who want to track their menstrual cycles for personal health awareness, those actively trying to conceive and need ovulation and fertility predictions, and individuals seeking a natural birth control method through cycle monitoring. It is also useful for anyone who values a private, anonymous way to log symptoms and moods without creating an account.

To improve prediction accuracy, consistently log your daily symptoms, basal body temperature, and flow intensity—the more data you enter, the more personalized your cycle and ovulation forecasts become.

Period Calendar Period Tracker stands out as a feature-rich and privacy-conscious choice for menstrual and fertility tracking. Its wide range of tracking options, combined with the upgraded Pregnancy Mode and Wear OS support, makes it a versatile tool. While the presence of ads and in-app purchases may be a minor drawback, the strong user rating and extensive feature set justify its popularity. For anyone seeking a reliable and secure period tracker, this app is a solid option.