Koi Pond

Tap to feed generative koi in a serene virtual pond sim.

Built by Chris Pirillo with OpenAI and Claude, this virtual koi pond grows each fish from a unique procedural genome — every nishikigoi has its own colour, pattern, and markings. Click the water to scatter food pellets, watch ripples and caustics radiate outward, and experience a live day-to-night lighting cycle that shifts the whole mood of the pond. No account, runs entirely client-side.