Drawing apps for iOS are easy to come by, with Paper by FiftyThree or Adobe’s Sketch being the most notable and identifiable apps. Those ask that you use them to completion, though, and provide you with the tools necessary to finish works of art. What if you just want a sketching app, though? Those do the trick, but a new app, Forge, is made for it. Rather than creating something that looks like a painting, Forge is meant for brainstorming.