I found a new BYOT tool (iOs and Android app) to share today called ExitTicket.
A free teacher account is required, but after that, it's very easy to set up and use.
ExitTicket provides performance and progression metrics for each student and the class as a whole in real time. The individualized data allows students to set their own goals and direct their own learning. If you like, spend some time this summer getting to know ExitTicket and how it can personalize learning in your classroom next fall.