BLACKBOARD ON YOUR MOBILE DEVICE Simple blackboard with some advanced options. You can draw anything you want with different colors. You can use it for drawing, illustrations, math calculations and etc. "Blackboard" is realistic and has various tools and options: • 5 different colors of chalk. • 5 different sizes of chalk. • Undo actions. • Erase everything at once. • Allows you to replay what you already drawn. • 3 style of blackboard (4 line, 5 line and math block).