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)
- ?
- Show this list
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.
Overdamped: eases in, no overshoot.
s
How long it feels. It fully settles in 1762 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-gentle: linear(0, 0.0145 1.17%, 0.056 2.5%, 0.413 10.5%, 0.5176 13.33%, 0.6049 16.17%, 0.6844 19.33%, 0.7541 22.83%, 0.8107 26.5%, 0.8594 30.67%, 0.898 35.17%, 0.9295 40.33%, 0.9714 53%, 0.9915 70%, 1);
--ease-gentle-duration: 1762ms;
}
.element {
transition: transform var(--ease-gentle-duration) var(--ease-gentle);
}
/* Browsers without linear() support (pre-2023) fall back to ease-out. */
@supports not (transition-timing-function: linear(0, 1)) {
:root { --ease-gentle: ease-out; }
}15 stops · 193 chars · max error 0.0048