KUTE.js is a native JavaScript animation engine featuring great code quality

samuel CSS3 & CSS, HTML5 255 , , , ,


A fully fledged native JavaScript animation engine with most essential features for web developers, designers and animators, delivering easy to use methods to set up high performance, cross-browser animations. The focus is code quality, flexibility, performance and size (core engine is 17k min and 5.5k gzipped).

NPM Version NPM Downloads jsDeliver CDNJS

Along with a simple jQuery plugin, KUTE.js packs plugins for presentation attributes, SVG transform, draw SVG strokes and path morphing, text string write up or number countdowns, plus additional CSS properties like colors, border-radius or typographic properties.

Because of it’s modularity, KUTE.js makes it super easy to extend or override functionality, making it unique among Javascript animation engines.

Demo / Developer Guide

For documentation, examples and other cool tips, check the demo.

Core Engine – visit page

  • tween object methods: .to().fromTo().allTo().allFromTo()

  • tween control methods: .start().stop().pause().play()

  • 2D and 3D transforms: all except matrixmatrix3dscale3drotate3d

  • box model properties: topleftwidthheight

  • colors: colorbackgroundColor

  • scroll: vertical scroll animation for window or any element with overflow: auto|scroll

  • options: yoyodurationeasingrepeatdelayoffset (for tween collections), repeatDelay and other transform/plugins related options

  • Robert Penner’s easing functions

  • extensible prototypes and utility methods

SVG Plugin – visit page

  • morphs SVGs with the path tween property, updating the d attribute of <path> or <glyph> elements

  • cross-browser SVG transform via the svgTransform property and the transform presentation attribute, this feature also helps stacking transform functions on chained tweens

  • draws SVG stroke with the draw tween property for most SVG
    elements: <path><glyph><polygon> or <polyline>,
    <ellipse> or <circle><rect>

CSS Plugin – visit page

  • all box model properties: marginpadding, with all their variations like marginTop, all variations for width or height like maxHeight or minWidthoutlineWidthborderWidth with all side variations, except short-hand notations

  • borderRadius properties and all side variations, shorthand notations and early implementations are not supported

  • color properties: outlineColorborderColor with all side variations except shorthands, etc

  • clip property only for rect type of values

  • backgroundPosition property with the ability to understand strings like top left and such

  • typographic properties: fontSizelineHeightlettersSpacing and wordSpacing

Text Plugin – visit page

  • animated number increments/decreases

  • writing text with a cool effect

Attributes Plugin – visit page

  • animates any numeric presentation attribute with suffixed value

  • animates any other non-suffixed numeric presentation attribute

  • animates fillstroke and stop-color color properties

  • handles attributes namespaces properly with stroke-opacity or strokeOpacity

  • properly handles the suffixes for you and depends very much on the current values then values you input

Easing Functions – visit page

NOTE: Starting with KUTE.js v 1.6.0 the Physics and Cubic Bezier Functions are removed from the distribution folder and from CDN repositories, but you can find them in the Experiments repository on Github. The reasons for that is to make it easy to maintain what’s more important: core code quality and the ability to create custom builds.

  • optimized dynamics easing functions

  • optimized cubic-bezier easing functions

jQuery Plugin

This aims to make the KUTE.js script work native within other jQuery apps but it’s not always really needed as we will see in the second subchapter here. Since the demos don’t insist on this particular plugin, we’ll write some basics right here.

The plugin is just a few bits of code to bridge all of the KUTE.js methods to your jQuery apps. The plugin can be found in the /experiments branch only.


You can install this through NPM or bower respectively:

$ npm install kute.js
# or
$ bower install kute.js

CommonJS/AMD support

You can use this module through any of the common javascript module systems. For instance:

// CommonJS style//grab the corevar kute = require("kute.js");// Add SVG Pluginrequire("kute.js/kute-svg");// Add CSS Pluginrequire("kute.js/kute-css");// Add Attributes Pluginrequire("kute.js/kute-attr");// Add Text Pluginrequire("kute.js/kute-text");// AMD styledefine([    "kute.js", // core engine
    "kute.js/kute-jquery.js", // optional for jQuery apps
    "kute.js/kute-svg.js", // optional for SVG morph, draw and other SVG related CSS
    "kute.js/kute-css.js", // optional for additional CSS properties
    "kute.js/kute-attr.js", // optional for animating presentation attributes
    "kute.js/kute-text.js" // optional for string write and number incrementing animations], function(KUTE){    // your stuff happens here, for instance
    // KUTE.fromTo('some-selector',{translateX:150}).start();});

Basic Usage

At a glance, you can write one line and you’re done.

//vanilla jsKUTE.fromTo('selector', fromValues, toValues, options).start();//with jQuery plugin$('selector').fromTo(fromValues, toValues, options).start();

Advanced Usage

Quite easily, you can write ‘bit more lines and you’re making the earth go round.

//vanilla js is always the coolestKUTE.fromTo(el,
    { translate: 0, opacity: 1 }, // fromValues
    { translate: 150, opacity: 0 }, // toValues
    // tween options object
    { duration: 500, delay: 0, easing	: 'exponentialInOut', // basic options
      // callbacks
      start: functionOne, // run function when tween starts
      complete: functionTwo, // run function when tween animation is finished
      update: functionFour // run function while tween running    
      stop: functionFive // run function when tween stopped    
      pause: functionSix // run function when tween paused    
      resume: functionSeven // run function when resuming tween    
).start(); // this is to start animation right away

Using the jQuery Plugin

Here’s a KUTE.js jQuery Plugin example that showcases most common usage in future apps:

// first we define the object(s)$('selector').fromTo( // apply fromTo() method to selector
    { translate: 0, opacity: 1 }, // fromValues
    { translate: 150, opacity: 0 }, // toValues
    // tween options object
    { duration: 500, delay: 0, easing	: 'exponentialInOut', // basic options
      start: functionOne, // run function when tween starts
      complete: functionTwo, // run function when tween animation is finished
      update: functionFour // run function while tween running    
      stop: functionFive // run function when tween stopped    
      pause: functionSix // run function when tween paused    
      resume: functionSeven // run function when resuming tween       
).start(); // then we apply the tween control methods, like start

Starting with KUTE.js 1.5.7, the jQuery Plugin got lighter and uses the proper method automatically based on how many elements are returned from selector. If one element the proper single object method is used fromTo() or to() but if more than one elements are returned it will use allFromTo() or allTo().

Alternative usage in jQuery powered applications

When size matters, you can handle animations inside jQuery applications without the plugin. Here’s how:

var tween = KUTE.fromTo($('selector')[0], fromValues, toValues, options);// or simply provide a class|id selector, just like the usualvar tween = KUTE.fromTo('#myElement', fromValues, toValues, options);tween.start();

Pay attention to that $('selector')[0] as jQuery always creates an array of selected objects and not a single object, that is why we need to target a single HTML object for our tween object and not a colection of objects.

HTMLCollection objects should be handled with allFromTo() or allTo() methods.

var tween = KUTE.allFromTo($('selector'), fromValues, toValues, options);tween.start();

How it works

  • it computes all the values before starting the animation, then caches them to avoid layout thrashing that occur during animation

  • handles all kinds of transform properties and makes sure to always use the same order of the transform properties (translaterotateskewscale)

  • allows you to set perspective for an element or it’s parent for 3D transforms

  • computes properties’ values properly according to their measurement unit (px,%,deg,etc)

  • properly handles cross browser 3D transform with perspective and perspective-origin for element or it’s parent

  • converts HEX colors to RGB and tweens the numeric values, then ALWAYS updates color via RGB

  • properly replaces topcentered or any other background position with proper value to be able to tween

  • for most supported properties it reads the current element computed style property value as initial value (via currentStyle || getComputedStyle)

  • because it can read properties values from previous tween animations, KUTE.js can do some awesome chaining with it’s .to() method

  • allows you to add many callbacks: startupdatecompletepausestop, and they can be set as tween options

  • since translate3D is best for movement animation performance, kute.js will always use it

  • accepts “nice & easy string” easing functions, like linear or easingExponentialOut (removes the use of the evil eval, making development safer, easier and closer to standards 🙂

  • uses all 31 Robert Penner’s easing functions, as well as any other custom functions such as bezier and physics based easing functions

  • handles browser prefixes for you for transformperspectiveperspective-origin and requestAnimationFrame

  • all this is possible with a core script of less than 20k size!

Browser Support

Since most modern browsers can handle pretty much everything, legacy browsers need some help, so give them polyfills. I also packed a small polyfill set with most essential features required by KUTE.js to work, it’s called minifill, try it.


  • Dav aka @dalisoft contributed a great deal for the performance and functionality of KUTE.js

  • Ingwie Phoenix: RequireJS/CommonJS compatibility and usability with common package managers

  • Others who contribute to the project


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