Although Snap''!'' is implemented in JavaScript using an [[HTML5]] Canvas [[application programming interface]] (API), and because of that it runs on the major web-browsers on [[Microsoft Windows|Windows]], [[iOS]], [[OS X]] and [[Linux]] devices, it is actually built on top of ''Morphic.js''<ref name="morphic_js">{{cite web |last1=Mönig |first1=Jens |title=morphic.js |url=https://github.com/jmoenig/morphic.js/blob/master/morphic.txt |website=GitHub |accessdate=7 June 2023}}</ref>, a [[Morphic (software)|Morphic]] GUI, which serves as 'middle layer' between Snap! itself and 'bare' JavaScript. All things visible in Snap''!'' are morphs themselves, i.e. all buttons, sliders, dialog boxes, menus,entry fields, text rendering, blinking cursors etc. are created with morphic.js rather than using HTML DOM elements.
