ChemSpace is an open source interactive Javascript library which provides an easy way to display and analyze 2D chemical space within a web page. It implements a raster-based HTML5 canvas visualization using the open source Javascript framework KonvaJS. ChemSpace is multiplatform and works in all major internet browsers (Edge, Mozilla Firefox, Google Chrome, Safari, Opera). Its speed is determined by a client’s hardware and internet browser. For the smoothest experience, we recommend to use Google Chrome.