I find it extremely useful to keep account of even the smallest details of what I've done to my hair.
It is set up to where you can have more than one profile.
That comes in handy if say you & your sister are both using the app on a shared device.
Which contains a calendar to pick a date & allow you to write down any notes, measurements, or pics for that specific date.
It also contains an entire photo album where you can see all if the pics collectively
But to only see certain pics for a specific day you would need to go to the calendar inside of the diary & click on that specific day.
Then there is a tab to list your favorite products, staple prods & what you like about them!
If you are anything like me, keep your phone at hand & have to FIND time to even physically write on notebook & paper lol, this may be the app for you!!! I have literally used this EVERYDAY since downloading!! Just thought I'd share :-)