시크릿 생리 달력 is an application that allows users to record or automatically calculate ovulation days, ovulation periods, expected menstrual days, and menstrual periods using their smartphones. With its simple and clean interface, 시크릿 생리 달력 is a recommended tool for all women to keep track of their valuable information.

The app offers several features including a lock function to ensure privacy, menstrual record management, and the ability to record and track relationships, moods, and body temperature. Users can view their recorded data in the form of graphs based on different time periods. The app also allows users to make notes and easily access them in a separate section. Additionally, 시크릿 생리 달력 provides helpful guides for users to better understand the app's functions.

To ensure accurate predictions, users are advised to set their menstrual start date. By selecting the desired date and pressing the "Set as Start Date" button, the app will automatically save the menstrual record. In cases where there are overlapping ovulation or menstrual dates, users can delete redundant records by pressing the "Release Start Date" button or navigating to the "View" - "Menstrual Record" section.

Users can also register a new menstrual start date within ±7 days of the current start date, and the app will automatically replace it. Furthermore, if users register a menstrual start date that is later than the previous one, the app will automatically update the last menstrual start date accordingly.

Overall, 시크릿 생리 달력 is a user-friendly and practical application for women to conveniently track their menstrual cycles and related information.