I use a computer and a mouse :). The SP-Studio is created with the software Adobe Animate (formerly known as Adobe Flash). You can find a free trial version here). I use it to draw the single parts as vector images and for the ActionScript code to make the whole thing work.
Unfortunately Flash is dying, so I will have to create a new SP-Studio from scratch. For this new version I will continue to use Adobe Animate for the drawings, but the whole coding is done in Angular2. JetBrains WebStorm is used as an editor.
Posted in: 5) MAKING OF: Who made the SP-Studio and how