Firenzecard is great
The card is easy to use and was so worth the money. In many cases, it meant I didn’t have to stand in a line for a ticket and it is universally recognized. The app is very well designed and shows all the museums available with lots of information, including open days and hours. The ability to extend for another 48 hours is also a big plus, if you are staying longer than 3 days. I highly recommend this card when you are visiting Florence!