easeInOutBounce

It is slow at both ends and fast in the middle. It hops at both ends and crosses in the middle.

easeInOutBounce reaches 50% of its travel at 50% of the time and 90% at 66%. Its peak speed is 5.49x the average.

Classic easesfamily: bouncepeak 5.49x

Progress against time

The dashed line is linear. The dots mark 50% and 90% of the travel.

Velocity, in multiples of average speed

The dashed line is 1x, the speed of linear.

Live demo

The blue box uses the exact linear() string below, in your browser. The grey box is linear.

easeInOutBounce

linear

Your system asks for reduced motion, so the boxes rest at the end of the move.

Numbers

50% of travel: 50%of the time
90% of travel: 66%of the time
After 10% of time: 3%of the travel is done
Peak speed: 5.49xtimes the average
Overshoot: 0%stays inside the end
Undershoot: 0%never below the start
linear() points: 1281at a 0.002 tolerance
cubic-bezier: nonecannot express it

Copy the code

css linear() (exact)

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cubic-bezier: no usable fit

/* Best single fit, off by up to 16 points of travel: cubic-bezier(0.56, 0.02, 0.44, 1) */

A cubic-bezier() has two control points and makes one smooth S. easeInOutBounce changes direction 12 times, so no four numbers draw it. Use the linear() string above.

web animations api

el.animate({ translate: ['0 0', '240px 0'] }, { duration: 600, easing: 'linear(0, 0.0005, 0.001, 0.0015, 0.002, 0.0025, 0.0029, 0.0033, 0.0037, 0.0041, 0.0044, 0.0048, 0.0051, 0.0054, 0.0057, 0.006, 0.0062, 0.0065, 0.0067, 0.0069, 0.007, 0.0072, 0.0073, 0.0075, 0.0076, 0.0077, 0.0077, 0.0078, 0.0078, 0.0078, 0.0078, 0.0078, 0.0077, 0.0077, 0.0076, 0.0075, 0.0074, 0.0072, 0.0071, 0.0069, 0.0067, 0.0065, 0.0063, 0.006, 0.0058, 0.0055, 0.0052, 0.0049, 0.0045, 0.0042, 0.0038, 0.0034, 0.003, 0.0025, 0.0021, 0.0016, 0.0011, 0.0006, 0.0001, 0.0009, 0.0019, 0.003, 0.004, 0.005, 0.0059, 0.0069, 0.0078, 0.0088, 0.0097, 0.0105, 0.0114, 0.0123, 0.0131, 0.0139, 0.0147, 0.0155, 0.0162, 0.0169, 0.0177, 0.0184, 0.019, 0.0197, 0.0203, 0.021, 0.0216, 0.0222, 0.0227, 0.0233, 0.0238, 0.0243, 0.0248, 0.0253, 0.0258, 0.0262, 0.0266, 0.027, 0.0274, 0.0278, 0.0281, 0.0285, 0.0288, 0.0291, 0.0293, 0.0296, 0.0298, 0.0301, 0.0303, 0.0304, 0.0306, 0.0307, 0.0309, 0.031, 0.0311, 0.0311, 0.0312, 0.0312, 0.0312, 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vawe

import { easeInOutBounce } from '../../core/motion/curves.js';
import { curveToLinear } from '../../core/motion/springs.js';

const easing = curveToLinear(easeInOutBounce, { tolerance: 0.002 }); // the linear() string above
const x = easeInOutBounce(u);                                         // per-frame code, u in 0..1

When to use it, and when to avoid it

Use it for

A toy-like pass across the frame that hops at both ends.

Avoid it for

Nearly everything else: two sets of hops make one clean move impossible.

The nearest vawe ease

The closest of the nine vawe After Effects eases is settle, an RMS gap of 0.0551 in progress. After Effects and vawe set the shape with two handles, so it can be tuned where a named curve cannot.

easeInBouncecurve gap 0.298
easeOutBouncecurve gap 0.298
settlecurve gap 0.0551
easeInOutQuadcurve gap 0.0602
easeInOutCubiccurve gap 0.0603
ease-in-outcurve gap 0.0624