FidgetPal

A fidget companion that lives on your desk: prop your phone or tablet up in your workspace and SLAP or TAP the surface to make it react ᓀ‸ᓂ. An experimental Svelte web app driven by the mobile browser's physics sensors — it even keeps rendering in iOS picture-in-picture by working around Safari's policy of pausing hidden elements, so the companion keeps reacting while you use other apps.

Tuned for a device resting on a desk rather than held in hand, so it's deliberately sensitive. Don't actually hit your device hard — it reacts plenty to gentle taps.