Inter-Blackboard APK

Easy to share a blackboard with your friends ~ Just create a group ~ Share your blackboard with others ! What you need to do is just to create a group and invite your friends．When stay in the same room , you could paint anything you want to communicate with each other. Everyone in the group will see what is happening on the board. So,be creative ~ . PS. This is my first APP and any comments will be appreciated. Thanks