Skip to content
Open Props

Easings

Custom animation easing is a great way to customize the motion ethos in a design system. These easing props are one of the best augmentation packages for existing design systems, bringing motion tokens to systems that haven’t gotten there yet.

Usage

A preview of what it looks like to use Open Props within a project.

component.css
.card {
  animation: fade-out .5 var(--ease-out-5) infinite;
}


.button {
  transition: transform .5s var(--ease-spring-3);
}
component.js
import {Spring, EaseOut} from 'open-props/easings.js';


card.style.animation = `fade-out .5s ${EaseOut[5]} infinite`;
button.style.transitionTimingFunction = Spring[3];


await Promise.all([
  box1.animate([{ transform: 'scale(0)'}], {
    duration: 500,
    delay:0,
    easing: Spring[3]
  }).finished,
  box2.animate([{ transform: 'scale(0)'}], {
    duration: 500,
    delay:100,
    easing: Spring[3]
  }).finished,
])

Importing

Get the props into your project via NPM or CDN.

NPM

@import 'open-props/easings.css';

CDN

@import 'https://unpkg.com/open-props/easings.css';

The Props

The lower the number, the weaker the effect.

Ease

:where(:root) {
  --ease-1: cubic-bezier(0.25, 0, 0.5, 1);
  --ease-2: cubic-bezier(0.25, 0, 0.4, 1);
  --ease-3: cubic-bezier(0.25, 0, 0.3, 1);
  --ease-4: cubic-bezier(0.25, 0, 0.2, 1);
  --ease-5: cubic-bezier(0.25, 0, 0.1, 1);
}

Ease in

:where(:root) {
  --ease-in-1: cubic-bezier(0.25, 0, 1, 1);
  --ease-in-2: cubic-bezier(0.5, 0, 1, 1);
  --ease-in-3: cubic-bezier(0.7, 0, 1, 1);
  --ease-in-4: cubic-bezier(0.9, 0, 1, 1);
  --ease-in-5: cubic-bezier(1, 0, 1, 1);
}

Ease out

:where(:root) {
  --ease-out-1: cubic-bezier(0, 0, 0.75, 1);
  --ease-out-2: cubic-bezier(0, 0, 0.5, 1);
  --ease-out-3: cubic-bezier(0, 0, 0.3, 1);
  --ease-out-4: cubic-bezier(0, 0, 0.1, 1);
  --ease-out-5: cubic-bezier(0, 0, 0, 1);
}

Ease in-out

:where(:root) {
  --ease-in-out-1: cubic-bezier(0.1, 0, 0.9, 1);
  --ease-in-out-2: cubic-bezier(0.3, 0, 0.7, 1);
  --ease-in-out-3: cubic-bezier(0.5, 0, 0.5, 1);
  --ease-in-out-4: cubic-bezier(0.7, 0, 0.3, 1);
  --ease-in-out-5: cubic-bezier(0.9, 0, 0.1, 1);
}

Elastic in

:where(:root) {
  --ease-elastic-in-1: cubic-bezier(0.5, -0.25, 0.75, 1);
  --ease-elastic-in-2: cubic-bezier(0.5, -0.5, 0.75, 1);
  --ease-elastic-in-3: cubic-bezier(0.5, -0.75, 0.75, 1);
  --ease-elastic-in-4: cubic-bezier(0.5, -1, 0.75, 1);
  --ease-elastic-in-5: cubic-bezier(0.5, -1.25, 0.75, 1);
}

Elastic out

:where(:root) {
  --ease-elastic-out-1: cubic-bezier(0.5, 0.75, 0.75, 1.25);
  --ease-elastic-out-2: cubic-bezier(0.5, 1, 0.75, 1.25);
  --ease-elastic-out-3: cubic-bezier(0.5, 1.25, 0.75, 1.25);
  --ease-elastic-out-4: cubic-bezier(0.5, 1.5, 0.75, 1.25);
  --ease-elastic-out-5: cubic-bezier(0.5, 1.75, 0.75, 1.25);
}

Elastic in-out

:where(:root) {
  --ease-elastic-in-out-1: cubic-bezier(0.5, -0.1, 0.1, 1.5);
  --ease-elastic-in-out-2: cubic-bezier(0.5, -0.3, 0.1, 1.5);
  --ease-elastic-in-out-3: cubic-bezier(0.5, -0.5, 0.1, 1.5);
  --ease-elastic-in-out-4: cubic-bezier(0.5, -0.7, 0.1, 1.5);
  --ease-elastic-in-out-5: cubic-bezier(0.5, -0.9, 0.1, 1.5);
}

Step

:where(:root) {
  --ease-step-1: steps(2);
  --ease-step-2: steps(3);
  --ease-step-3: steps(4);
  --ease-step-4: steps(7);
  --ease-step-5: steps(10);
}

Spring

:where(:root) {
  --ease-spring-1: linear(0,0.006,0.025 2.8%,0.101 6.1%,0.539 18.9%,0.721 25.3%,0.849 31.5%,0.937 38.1%,0.968 41.8%,0.991 45.7%,1.006 50.1%,1.015 55%,1.017 63.9%,1.001);
  --ease-spring-2: linear(0,0.007,0.029 2.2%,0.118 4.7%,0.625 14.4%,0.826 19%,0.902,0.962,1.008 26.1%,1.041 28.7%,1.064 32.1%,1.07 36%,1.061 40.5%,1.015 53.4%,0.999 61.6%,0.995 71.2%,1);
  --ease-spring-3: linear(0,0.009,0.035 2.1%,0.141 4.4%,0.723 12.9%,0.938 16.7%,1.017,1.077,1.121,1.149 24.3%,1.159,1.163,1.161,1.154 29.9%,1.129 32.8%,1.051 39.6%,1.017 43.1%,0.991,0.977 51%,0.974 53.8%,0.975 57.1%,0.997 69.8%,1.003 76.9%,1);
  --ease-spring-4: linear(0,0.009,0.037 1.7%,0.153 3.6%,0.776 10.3%,1.001,1.142 16%,1.185,1.209 19%,1.215 19.9% 20.8%,1.199,1.165 25%,1.056 30.3%,1.008 33%,0.973,0.955 39.2%,0.953 41.1%,0.957 43.3%,0.998 53.3%,1.009 59.1% 63.7%,0.998 78.9%,1);
  --ease-spring-5: linear(0,0.01,0.04 1.6%,0.161 3.3%,0.816 9.4%,1.046,1.189 14.4%,1.231,1.254 17%,1.259,1.257 18.6%,1.236,1.194 22.3%,1.057 27%,0.999 29.4%,0.955 32.1%,0.942,0.935 34.9%,0.933,0.939 38.4%,1 47.3%,1.011,1.017 52.6%,1.016 56.4%,1 65.2%,0.996 70.2%,1.001 87.2%,1);
}

Bounce

:where(:root) {
  --ease-bounce-1: linear(0,0.004,0.016,0.035,0.063,0.098,0.141,0.191,0.25,0.316,0.391 36.8%,0.563,0.766,1 58.8%,0.946,0.908 69.1%,0.895,0.885,0.879,0.878,0.879,0.885,0.895,0.908 89.7%,0.946,1);
  --ease-bounce-2: linear(0,0.004,0.016,0.035,0.063,0.098,0.141 15.1%,0.25,0.391,0.562,0.765,1,0.892 45.2%,0.849,0.815,0.788,0.769,0.757,0.753,0.757,0.769,0.788,0.815,0.85,0.892 75.2%,1 80.2%,0.973,0.954,0.943,0.939,0.943,0.954,0.973,1);
  --ease-bounce-3: linear(0,0.004,0.016,0.035,0.062,0.098,0.141 11.4%,0.25,0.39,0.562,0.764,1 30.3%,0.847 34.8%,0.787,0.737,0.699,0.672,0.655,0.65,0.656,0.672,0.699,0.738,0.787,0.847 61.7%,1 66.2%,0.946,0.908,0.885 74.2%,0.879,0.878,0.879,0.885 79.5%,0.908,0.946,1 87.4%,0.981,0.968,0.96,0.957,0.96,0.968,0.981,1);
  --ease-bounce-4: linear(0,0.004,0.016 3%,0.062,0.141,0.25,0.391,0.562 18.2%,1 24.3%,0.81,0.676 32.3%,0.629,0.595,0.575,0.568,0.575,0.595,0.629,0.676 48.2%,0.811,1 56.2%,0.918,0.86,0.825,0.814,0.825,0.86,0.918,1 77.2%,0.94 80.6%,0.925,0.92,0.925,0.94 87.5%,1 90.9%,0.974,0.965,0.974,1);
  --ease-bounce-5: linear(0,0.004,0.016 2.5%,0.063,0.141,0.25 10.1%,0.562,1 20.2%,0.783,0.627,0.534 30.9%,0.511,0.503,0.511,0.534 38%,0.627,0.782,1 48.7%,0.892,0.815,0.769 56.3%,0.757,0.753,0.757,0.769 61.3%,0.815,0.892,1 68.8%,0.908 72.4%,0.885,0.878,0.885,0.908 79.4%,1 83%,0.954 85.5%,0.943,0.939,0.943,0.954 90.5%,1 93%,0.977,0.97,0.977,1);
}
Need help? Join us in Discord and ask a question, help could be a few minutes away.