Moonbook: Menstrual Assistant is a free period management tool designed specifically for girls. It offers accurate predictions, convenient recording, and graphical statistical information to help you understand your menstrual cycle better. This app serves as a female calendar that marks the menstrual cycle, ovulation period, ovulation day, safe period, fertile period, etc., with colors, making it easy to understand and plan accordingly.

The app's interactive interface is designed beautifully and intuitively, making it easy to use. The main panel integrates various reminders of the menstrual cycle, which are simple and clear at a glance. The calendar uses a variety of color markings, allowing you to understand clearly and arrange reasonably. The app also provides a record-keeping feature that includes bleeding volume, common menstrual symptoms, and private records. You can display the menstrual cycle in the form of a chart and provide an average value to help you better understand your menstrual situation. Additionally, you can set menstrual reminders, fertility reminders, and ovulation day reminders separately. You can also turn on the password protection function to protect privacy.