Witeboard is described as 'lets you create quick sketches on desktop, tablet, or phone in a few minutes and collaborate with your team real-time' and is a Whiteboard App in the Office & Productivity category. There are four alternatives to Witeboard for iPad, iPhone, Online / Web-based, Skype and Windows. Most alternatives are Whiteboard and Team Collaboration Apps. The best alternative is IDroo. It's not free, so if you're looking for a free alternative, you could try Whiteboard Team or Inko - Whiteboard.
A shared whiteboard for use by multiple Skype-users simultaneously. Features Instant collaboration Everything you draw or write is visible to all participants in real time. Share ideas just like you were in the same room.
Draw together in real time, from anywhere! In seconds, anyone can follow along with your drawing or draw with you from the app or on the web. Use Scribble alongside a call; talk with FaceTime or any other app you like.