...Its API mirrors Box2D’s concepts — bodies, fixtures, shapes, joints — which makes it familiar to users of classic Box2D, while being idiomatic for JavaScript developers. Because it's pure JavaScript, Planck.js integrates easily with HTML5 canvas, WebGL, or other browser-based rendering pipelines, facilitating smooth physics-driven games across platforms. It also is conducive to rapid prototyping and experimentation, since it avoids the complexity of compiling native libraries for web.