SynDraw app for iPhone and iPad
SynDraw is an annotate application that can perform simple painting with multiple brushes and features. With embossed brushes, blurred brushes, and highlighter, you can also enrich your sketch with a variety of graphics. The text function is convenient for annotate, and the background of sketch can also freely be changed in different colors. The picture import feature allows you to add a few more ideas to your own pictures.