Popular drawing and sketching app Procreate Pocket for the iPhone can be downloaded for free this week through Apple's Apple Store app. Procreate Pocket has a wide range of painting, sketching, and drawing tools for making art on the iPhone.
On the iPhone 6s, it features 3D Touch pressure sensitivity, and it can be used with an Apple Watch for quick color selection. There's a full layering system, 18 layer blend modes, tools for adjusting hue, saturation, brightness, and curves, and more.
To get the app, make sure to follow these instructions: