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Adobe Ideas is pretty much Photoshop for your iPhone/iPad or iPod Touch. The basic version is completely free but there is an in app purchase price of £2.99/$4.99 to unlock the ability to use 15 layers. One layer is probably enough for most users and the app isn’t just for creating drawings you can use it for quickly writing down ideas, mind mapping and brain storming etc

There are tons of included settings, a colour picker, different brush sizes and a really cool smoothing effect that makes even the messiest of hand writing look good!