Folio Motion

Every animation parameter in this template can be scored by a numerical physics engine. The spring equation is integrated at a fixed 240Hz step, and the settle time, overshoot and onset latency you see are measured from that integration, not looked up in a table.

It ships with a real backend, an MCP agent interface, a SHA-384 audit chain, and a browser test suite that runs on desktop and mobile. It is also genuinely easy to make your own, because all the content lives in one file.

What made it interesting

• Fixed-step integrator means identical output on every machine
• Rest detection needs a velocity condition, or an under-damped spring looks like it never overshoots
• Exports CSS with a prefers-reduced-motion block already written for you

The bit I'm proudest of

The first version reported zero overshoot for violently bouncing motion. The physics test that caught it is now the one I would point a new contributor at first.