Design springs and easing curves. Export pure CSS.
Springs ship as linear(). How it works
Keyboard shortcuts
- Space
- Play
- B
- Compare: keep the current curve as B
- 1 – 6
- Switch scene
- C
- Copy the exported code
- ⌘Z / Ctrl+Z
- Undo
- ⇧⌘Z / Ctrl+Shift+Z
- Redo
- Arrow keys
- Move a focused bezier handle (Shift: bigger steps)
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Curve
Load into
Springs
Bezier curves
How to read it
Top row: where the element sits on each frame, so bunched ticks mean slow motion. Bottom row: the same frames in time order, each bar the distance travelled, so the settle is easy to read. Keys are circled.
Overshoots, then settles.
s
How long it feels. It fully settles in 825 ms, the exported duration.
Stiffness and damping
Mass is fixed at 1; only the ratio matters.
Preview
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How to read it
Top row: where the element sits on each frame, so bunched ticks mean slow motion. Bottom row: the same frames in time order, each bar the distance travelled, so the settle is easy to read. Keys are circled.
Export
:root {
--ease-bouncy: linear(0, 0.0069 1.17%, 0.0299 2.5%, 0.0661 3.83%, 0.1191 5.33%, 0.2348 8%, 0.619 16%, 0.7297 18.67%, 0.8187 21.17%, 0.8926 23.67%, 0.9514 26.17%, 0.9987 28.83%, 1.0318 31.5%, 1.0603 35.67%, 1.0679 40.5%, 1.0156 59.67%, 1.001 67.83%, 0.9954 79.17%, 1);
--ease-bouncy-duration: 825ms;
}
.element {
transition: transform var(--ease-bouncy-duration) var(--ease-bouncy);
}
/* Browsers without linear() support (pre-2023) fall back to ease-out. */
@supports not (transition-timing-function: linear(0, 1)) {
:root { --ease-bouncy: ease-out; }
}19 stops · 251 chars · max error 0.0049