This is an application that lets you use your iOS device as a chalk board. Display to an audience is through a projector/display.
Air Chalk is an application that can help replace traditional chalkboard or blackboard. It lets you write content on a iOS device. Same thing is displayed to your audience using an LCD display or projector. It is possible to use Air Chalk in other configurations such as with one iOS device, two pairing iOS devices, or with a computer. The iOS device needs to be used in either finger sketch or text input modes. Quick undo and redo supports ensures mistakes could be corrected immediately. Multi-color chalks could be used to write the content. Eraser is available. Real time display of chalk board contents on an external display is possible. It is compatible with Apple Digital AV Adapter and Apple VGA Adapter.
It is possible to work wirelessly through the Blue tooth and Wi-Fi connections. For a long class that needs rewriting of boards multiple times, the boards created could be saved and replayed later. For ease of distribution, these saved boards could be turned into PDF documents. Printing or emailing of these is possible too. If you want, the boards can be saved as images and shared on photo sharing services. After download of the app all you need to do is to hook up to a projector or external display and it is all set. This is a very good product. If you are looking for a similar solution, you should try it in your exact workflow.