Life & fun · September 1, 2026
Beadfall
A handful of beads, held inside your watch
What it does
Nine hundred beads of simulated water inside your Apple Watch. Tilt your wrist and they pour; flick it and they climb the wall and rain back down. Real physics at 60fps, computed entirely on the watch. No score, no notifications, nothing to achieve. $2.99 once: no ads, no accounts, no subscriptions, and no network code at all.
Nine hundred beads, simulated on your Apple Watch sixty times a second. Tilt your wrist and they pour. No score, no notifications, nothing to achieve.
Tilt your wrist and they fall. Hold still and they settle. Flick it and they climb the wall, break against it, and rain back down. None of it is animation. Nine hundred beads are solved sixty times a second, pulled by the gravity your wrist is actually moving through. The solver is a position-based fluid — Clavet double density relaxation — written in Swift and run on the watch itself. Nothing is precomputed, nothing is a texture, and no two pours are the same. watchOS has no Metal, so there is no GPU to hand the drawing to. Every frame is rasterised on the CPU of a computer the size of a postage stamp, and it still holds sixty frames a second. The beads at the top of this page are a…from beadfall.com
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