VanillaJS implementation of an animated rising / falling number

VanillaJS implementation of an animated rising / falling number

number-rollup is an ES6 library to create an attractive number counter with animated counting on the webpage.



  • Smooth rising / falling number animations
  • VanillaJS
  • Zero dependencies
  • 2KB gzipped
  • No CSS; styling is under your control
  • Uses requestAnimationFrame() rather than setTimeout()

Some browsers have options that implement anti-fingerprinting techniques which significantly reduce the millisecond accuracy of new Date() and These options are not enabled by default in Firefox (privacy.resistFingerprinting) or Chrome but, if they are, the animation won't run as smoothly.


npm install number-rollup --save


There are two ways to create animations.

Method A:

Invoke the method on an element-by-element basis.

<div id="example-1"></div>
import numberRollup from "number-rollup";

    id: "example-1",
    startNumber: 0,
    endNumber: 500,
    duration: 500, // Milliseconds
Method B:

Apply class .number-rollup to one or more target elements and use data attributes to set the options. numberRollup() will find all elements with the class and apply the animation.

import numberRollup from "number-rollup";



id: string The ID of the target element when creating a single animation.

startNumber: Number The animation will roll from this number. Must be an integer.

endNumber: Number The animation will roll to this number. Must be an integer.

duration: Number The duration of the animation in milliseconds. Must be an integer.

formatNumber: function (optional) A function that will be applied to the animated number each time before it is drawn. For example, turning 500 into $500. See the demo for a usage example.

Download Details:

Author: marknorrapscm


Source Code:


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