Microsoft Whiteboard is one of the best digital online whiteboard apps for teaching, ideas sharing, drawing, and where you need to share ideas collaboratively for team and friends. You can use this online whiteboard app on Windows 10, iOS devices and web.
Drawpile is a free online whiteboard app that allows multiple people to drawing on the same image in real-time. This collaborative drawing tool provides diverse brushes for a brainstorm, and support recording and making short videos.