I am still figuring this out...I used to use <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Period Tracker</a>, and am switching over. From my understanding you don't need a password every time you open the app? I wish that was an option!! This kinda stuff is fine to talk about with certain people, but over the course of the day my phone is seen by lots of people...you know? Kinda want to keep it personal!