easeInOutCirc

It is slow at both ends and fast in the middle. A geometric curve: it starts or stops almost vertically, like a wall.

easeInOutCirc reaches 50% of its travel at 50% of the time and 90% at 70%. Its peak speed is over 20x (it ends vertically) the average.

Classic easesfamily: circpeak over 20x

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. The chart stops at 12x.

Live demo

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

easeInOutCirc

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: 70%of the time
After 10% of time: 1.01%of the travel is done
Peak speed: over 20xit ends vertically
Overshoot: 0%stays inside the end
Undershoot: 0%never below the start
linear() points: 1281at a 0.002 tolerance
cubic-bezier: closeworst gap 3.5 points

Copy the code

css linear() (exact)

animation-timing-function: linear(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.0001, 0.0001, 0.0001, 0.0001, 0.0001, 0.0001, 0.0002, 0.0002, 0.0002, 0.0002, 0.0002, 0.0003, 0.0003, 0.0003, 0.0004, 0.0004, 0.0004, 0.0004, 0.0005, 0.0005, 0.0005, 0.0006, 0.0006, 0.0007, 0.0007, 0.0007, 0.0008, 0.0008, 0.0009, 0.0009, 0.001, 0.001, 0.0011, 0.0011, 0.0012, 0.0012, 0.0013, 0.0014, 0.0014, 0.0015, 0.0015, 0.0016, 0.0017, 0.0017, 0.0018, 0.0018, 0.0019, 0.002, 0.0021, 0.0021, 0.0022, 0.0023, 0.0024, 0.0024, 0.0025, 0.0026, 0.0027, 0.0027, 0.0028, 0.0029, 0.003, 0.0031, 0.0032, 0.0033, 0.0034, 0.0034, 0.0035, 0.0036, 0.0037, 0.0038, 0.0039, 0.004, 0.0041, 0.0042, 0.0043, 0.0044, 0.0045, 0.0046, 0.0047, 0.0049, 0.005, 0.0051, 0.0052, 0.0053, 0.0054, 0.0055, 0.0057, 0.0058, 0.0059, 0.006, 0.0061, 0.0063, 0.0064, 0.0065, 0.0066, 0.0068, 0.0069, 0.007, 0.0072, 0.0073, 0.0074, 0.0076, 0.0077, 0.0079, 0.008, 0.0081, 0.0083, 0.0084, 0.0086, 0.0087, 0.0089, 0.009, 0.0092, 0.0093, 0.0095, 0.0096, 0.0098, 0.0099, 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0.9999, 0.9999, 0.9999, 0.9999, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1);

cubic-bezier (nearest fit)

animation-timing-function: cubic-bezier(0.88, 0.13, 0.12, 0.87);

Least-squares fit to the easeInOutCirc curve; the worst gap is 3.5 points of travel. It is close, not exact: use linear() when the end of the curve matters.

web animations api

el.animate({ translate: ['0 0', '240px 0'] }, { duration: 600, easing: 'linear(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.0001, 0.0001, 0.0001, 0.0001, 0.0001, 0.0001, 0.0002, 0.0002, 0.0002, 0.0002, 0.0002, 0.0003, 0.0003, 0.0003, 0.0004, 0.0004, 0.0004, 0.0004, 0.0005, 0.0005, 0.0005, 0.0006, 0.0006, 0.0007, 0.0007, 0.0007, 0.0008, 0.0008, 0.0009, 0.0009, 0.001, 0.001, 0.0011, 0.0011, 0.0012, 0.0012, 0.0013, 0.0014, 0.0014, 0.0015, 0.0015, 0.0016, 0.0017, 0.0017, 0.0018, 0.0018, 0.0019, 0.002, 0.0021, 0.0021, 0.0022, 0.0023, 0.0024, 0.0024, 0.0025, 0.0026, 0.0027, 0.0027, 0.0028, 0.0029, 0.003, 0.0031, 0.0032, 0.0033, 0.0034, 0.0034, 0.0035, 0.0036, 0.0037, 0.0038, 0.0039, 0.004, 0.0041, 0.0042, 0.0043, 0.0044, 0.0045, 0.0046, 0.0047, 0.0049, 0.005, 0.0051, 0.0052, 0.0053, 0.0054, 0.0055, 0.0057, 0.0058, 0.0059, 0.006, 0.0061, 0.0063, 0.0064, 0.0065, 0.0066, 0.0068, 0.0069, 0.007, 0.0072, 0.0073, 0.0074, 0.0076, 0.0077, 0.0079, 0.008, 0.0081, 0.0083, 0.0084, 0.0086, 0.0087, 0.0089, 0.009, 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vawe

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

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

When to use it, and when to avoid it

Use it for

Moves between two resting positions: camera pushes, slides and loops.
For circ: mechanical moves and wipes with a hard edge.

Avoid it for

Quick UI feedback under 200 ms: the slow start delays the response.
For circ: soft, organic motion: the stop feels cut.

The nearest vawe ease

The closest of the nine vawe After Effects eases is swap, an RMS gap of 0.0195 in progress. After Effects and vawe set the shape with two handles, so it can be tuned where a named curve cannot.

easeInCirccurve gap 0.3739
easeOutCirccurve gap 0.3739
swapcurve gap 0.0195
easeInOutQuartcurve gap 0.0285
easeInOutCubiccurve gap 0.0364
easeInOutQuintcurve gap 0.0378