Menstrual Calendar is a free Android application developed by BTSYS for women who want to track their menstrual cycle and ovulation. The app comes with a smart forecast feature that accurately predicts your periods, fertile days, and ovulation. It is an easy-to-use app that is password-protected to ensure privacy.

The customizable calendar allows you to track your menstrual cycle and ovulation. You can also track your weight and temperature and view charts to monitor changes. Additionally, the app includes multiple notifications for pill reminders and doctor appointments. You can backup and restore your data to/from an SD card.

The app allows you to enter symptoms according to body parts and add notes and facts. The developers have also included a new pregnancy mode feature. The app is ad-free, making it an excellent choice for women who want a reliable and straightforward period tracker.