SiteMotion & Animation · Animation engines
Timeline-based animation engine covering CSS, SVG, DOM attributes and JS objects; v4 rewrote it into tree-shakeable modules.
Why it’s a gem
v4's modular rewrite and WAAPI adapter make it a genuine GSAP substitute, free.
Declarative motion-graphics toolbelt for bursts, shape swirls and custom timelines; built for particle-style UI flourishes, not tweening DOM.
Functional, framework-agnostic motion primitives — springs, decay, keyframes, inertia — usable as building blocks under any renderer.
3KB Promise-based animation module for CSS and SVG properties, using requestAnimationFrame with no dependencies or plugin system.
Hybrid engine combining the Web Animations API with a JS spring runtime, shipping React, Vue and vanilla bindings.
ES6 tweening engine that interpolates numbers, colors, vectors and objects with a chainable API and no DOM assumptions.
Sub-kilobyte tweening engine exposing a single function that animates arbitrary numeric values over time with easing.