A lightweight, framework-agnostic JavaScript library for scroll-triggered animations with 40+ built-in effects.
USAL.js is an open-source JavaScript library for creating scroll-triggered animations on websites. It solves the problem of adding engaging, performant animations without complex setup or framework lock-in, using a simple HTML attribute syntax.
Frontend developers and designers building interactive websites who need lightweight, cross-framework compatible scroll animations.
Developers choose USAL.js for its combination of a tiny footprint (8KB), extensive built-in animation library, and seamless integration with any JavaScript framework or vanilla project, all through an intuitive declarative API.
USAL.js - Ultimate Scroll Animation Library - Lightweight, powerful, wonderfully simple ✨
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Offers 40+ built-in animations including fade, zoom, flip, and directional variants, providing versatile visual effects without extra configuration.
At only 8KB gzipped with zero dependencies, it's optimized for 60fps, ensuring minimal impact on page load and smooth scrolling.
Provides native support for React, Vue, Svelte, Solid, Angular, Lit, and vanilla JS via dedicated packages, eliminating framework lock-in.
Uses HTML data attributes like data-usal='fade-u' for easy implementation, reducing boilerplate code and learning curve.
Lacks support for SVG animations, as admitted in the feature comparison table where SVG is marked as ❌, limiting use in vector-based graphics.
Focuses exclusively on scroll-based animations, so it's not suitable for other trigger types like hover or click without custom JavaScript.
The attribute-based API can become cumbersome for complex, dynamic animations that require programmatic control or real-time adjustments.