Three.js is the more common of the two in our index: it runs on 331 websites against 28 for Konva.js, and 3 sites use both. Counts come from real scans, not vendor claims.
Konva.js is a JavaScript library for creating 2D canvas applications on both desktop and mobile platforms, utilising HTML5.
Three.js is a cross-browser JavaScript library and application programming interface used to create and display animated 3D computer graphics in a web browser using WebGL.
3 sites run both Konva.js and Three.js. That is 11% of the sites using Konva.js, the smaller of the two.
Want to know which one a particular site uses? Look it up and see its whole stack, or compare two sites side by side.