I am in the middle of researching menstruation tracking apps. I personally have had iPeriod since I got my first iphone. It was the only one available! Now there are a few good ones out there and a few that released too early (looking at you Aunt Flo).
I'm currently working on user testing but first let me introduce you to our users!
The women in these images are Nancy Pelosi (D-CA) age 76, Elizabeth Warren (D-MA) age 67, & Carolyn Maloney (D-NY) age 70. They are probably not super interested in period apps, but are interested in kicking ass in our legislative government.