Three.js is the more common of the two in our index: it runs on 296 websites against 233 for anime.js, and 9 sites use both. Counts come from real scans, not vendor claims.
Anime.js (/ˈæn.ə.meɪ/) is a lightweight JavaScript animation library with a simple, yet powerful API.It works with CSS properties, SVG, DOM attributes and JavaScript Objects.
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.
9 sites run both anime.js and Three.js. That is 4% of the sites using anime.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.