For a limited time, drawing app Procreate Pocket is free to iPhone users
The app includes 64-bit color, 250 levels of continuous autosave, a 4K canvas and a layer system that can be customized. If you want more drawing tools, they can be imported into the app, or downloaded. And installing the Apple Watch version of the app allows you to select new brushes and color swatches for use on your iPhone. Those using the app can also record themselves in 1080p, memorializing the process of creating a 'masterpiece.'
If this sounds interesting to you, you can pick up the app for free by going to the "Featured" and "Stores" sections of the Apple Stores app for iOS. The price of Procreate Pocket is usually $2.99.
source: AppleStore via AppleInsider