Simple Whiteboard by Qrayon is a full version productivity and business application available exclusively for iPhone. This app is a simple and easy-to-use whiteboard that allows you to draw, write, and share ideas with others. The app makers at Qrayon boast that it is a no-fuss, no-muss app that is fast and easy, which is certainly true.

The app is designed to be straightforward and user-friendly. You can use it to illustrate your ideas or create diagrams, and then share them with others. The app also features the ability to mirror your iPhone or iPad via AirPlay, which makes it perfect for presentations or group discussions.

Overall, Simple Whiteboard by Qrayon is an excellent app for anyone who needs to share ideas or collaborate with others. It's fast, easy, and reliable, making it a must-have for anyone who needs a simple whiteboard app on their iPhone.