What are some alternatives?
When comparing Quill by Story Studio and Kingspray Graffiti, you can also consider the following products
A-Painter - Paint in VR in your Browser
Oculus Medium - Sculpt, model and paint in virtual reality on a 3D canvas.
MasterpieceVR - Powerful VR sculpting & painting tool
Tilt Brush by Google - Paint in spaces around you with Virtual Reality
Blocks - Empowering designers to build great websites without writing a line of code. For web and OS X.
Kodon - Kodon is the fastest-growing feature-rich VR sculpting and modeling software designed for professionals who want to do their commercial projects easily and quickly.