Animation
Transitions.dev
Essential transitions for web apps
What it is
40+ UI transitions (card resize, gooey menus, drag and drop with physics, 3D pointer tilt, spinner-to-check morphs) as plain CSS or React, each with a live hoverable preview instead of a static screenshot. Also installs as a skill for Claude Code, Cursor or Codex, and ships a Refine tool for iterating on a transition once it's in your project.