What are some alternatives?
When comparing Artyline and Sketch 2 Code, you can also consider the following products
Snap Art - Snap's augmented reality platform
PaintCode - PaintCode is a unique vector drawing app that generates Objective-C or Swift code in real time, acting as a bridge between developers and graphic designers.
Lightform - The design tool for projected AR
QuartzCode - Turn vector drawing and animation to ObjC / Swift Code. Easily add any animation your iOS project, whether in vector or raster image without any coding.
Yttrium - Quickly design AR and 3D prototypes on iOS
Neonto - Visual tool for creating native iOS and Android UIs