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.
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!
HHJ EVERYONE!!!!