The app ‘Menstrual Diary’ allows to track of menstrual cycle predictions, ovulation days

Features:
- Allow to mark the menstrual period, date of intercourse, add notes
- Allow to predict the next menstrual period, ovulation day
- Allow to view chart of menstrual cycle, intercourse

Video: https://youtu.be/5K-Q5G3Ly8s

Best android apps:
https://m.facebook.com/AndroidVN2018/
or
https://androidvn.tumblr.com
or
https://tlkhoa.blogspot.com/search/label/Android%20Apps