Introduction: Ovulation period is the best time for women to conceive. Knowing their ovulation period can help women better grasp the timing of conception, which is especially important for couples seeking children. Currently, there are many ovulation calculation tool APPs available for women to use. These APPs are convenient and practical and can help women easily calculate their ovulation period. Below, we recommend several useful ovulation calculation tools. The core function of Functional Ovulation Calculation Tool APP is to calculate a woman’s ovulation period. The calculation of ovulation period is based on the female