Prototype JS is described as 'Prototype is a JavaScript Framework that aims to ease development of dynamic web applications. Prototype provides various functions for developing JavaScript applications. The features range from programming shortcuts to major functions for dealing with XMLHttpRequest' and is an website in the development category. There are more than 10 alternatives to Prototype JS, not only websites but also apps for a variety of platforms, including Self-Hosted, Mac, Windows and Linux apps. The best Prototype JS alternative is jQuery, which is both free and Open Source. Other great sites and apps similar to Prototype JS are DHTMLX, Ext JS, Zepto.js and Dojo Toolkit.