Tracker is an iPhone application developed by Tatyana Kolesnikova. It falls under the category of Education & Reference, specifically in the field of Medicine. This free app provides users with the ability to track their menstrual cycle and receive notifications for the beginning of their menstrual period, ovulation, and when to take contraceptive pills.

With the period calendar feature, users can easily calculate their next menstrual period, ovulation days, and fertile period. This information is valuable for those planning for pregnancy as well as those looking for effective contraception methods. The app also supports iCloud syncing, ensuring that users can access their data across multiple devices.

Tracker is a comprehensive tool for women to monitor and manage their menstrual cycle. Its user-friendly interface and accurate tracking capabilities make it a valuable resource for those seeking to better understand their reproductive health.