This review is for the Mac version of Graphic. There are also apps for Ipad and Iphone.
Graphic has easy to use vector drawing tools, like freehand drawing, basic shapes, easily modified lines and a great text tool. Hard core Adobe Illustrator users probably are going to miss more advanced editing, but for about 30 USD you will probably not complain to much.
Something else to like is the automatic adjustment lines that does a good job of finding edges, centers and other key points useful for aligning objects.
The app seem to handle many file formats, as long as the file is using vector graphics. It opens Adobe illustrator files if you just change the file extension to .eps, for example.
Graphic uses plugins, but some does not seem to get updates anymore.
Autodesk bought Idraw from Indeeo in 2015 and the app is since then called Graphic.