OnMarkup is the perfect tool to markup images in any way you want. It also features a simple workflow that allows you to use the app as a correction tool if needed. Just use red to correct, and use green and checkmarks to provide feedback on those comments. From simply marking up a photo or a screenshot to using it as a production tool, onmarkup is your best option.

Christmas Editon!!! Now its a lot smaller, it practically doesnt take up any space on your device!.