Roll Book is a free Android application developed by OBN-soft in the Utilities & Tools category. It is a simple attendance tracker that allows you to toggle the mark of a cell in the sheet by tapping. You can mark a student as present with 'P', absent with 'A', late arrival with 'L', and early departure with 'E'. The best part is that you can customize these characters to your liking.

Roll Book also offers the ability to export data as a CSV file and import data from a CSV file. This feature makes it easy to share attendance data with others or import data from other sources. Overall, Roll Book is a straightforward and easy-to-use application that is perfect for tracking attendance in any setting.