Easing API
Evaluate animation easing and timing functions. The sample endpoint computes any of the 31 standard Penner easings — easeInOutCubic, easeOutBounce, easeInOutElastic, easeInBack, easeOutExpo, easeInOutSine and the rest — the four CSS keywords (ease, ease-in, ease-out, ease-in-out), or your own CSS cubic-bezier(x1,y1,x2,y2) timing function, solved exactly with Newton-Raphson. Ask for a single progress value t, or pass steps=N to get a ready-made table of {t, value} points for building keyframes, sprite timelines, scroll animations and interpolation lookup tables. The list endpoint returns every supported easing name with the cubic-bezier for the CSS keywords. Eased values may overshoot below 0 or above 1 for back, elastic and bounce, exactly as designers expect. Ideal for motion design, game and UI animation, CSS and canvas/WebGL tooling, charting and data-viz transitions, and anywhere you need a precise timing curve without pulling in a library. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This computes the curve values; to convert colours or build gradients use the colour and gradient APIs.
api.oanor.com/easing-api
