Kinetics

Reach for Kinetics when a user asks for one specific feel — a magnetic button, a rubber-band slider, an odometer counter — and you do not want to add Motion or GSAP as a dependency; most entries are pure CSS with a cubic-bezier approximation of a spring. Prefer it over Magic UI or Aceternity when the target project has no animation runtime, and prefer Motion when you need interruptible, physically-correct springs rather than a baked curve. Two cautions: the repo carries no LICENSE file, so treat reuse as legally unsettled and confirm with the user before shipping to a commercial product; and the effects are demo snippets, not a versioned API — you own the code once you paste it.

Why it is here. Nearly every copy-paste animation gallery ships fixed-duration easing and calls it spring; Kinetics actually exposes stiffness and damping per effect so you can feel the physics before you take the code. The volume (153) and the CSS-first bias make it unusually useful in projects that refuse a JS animation dependency.