Hueday

Every date gets its own unique hex color, computed deterministically.

Vibe-coded by Chris Pirillo using OpenAI and Claude, Hueday maps every calendar date — year included — to a unique hex code via a deterministic hash so the same birthday always returns the same shade, with dates one day apart producing wildly different colors. The result arrives with a four-swatch color-theory palette, a permanent shareable link, and a downloadable share card, all computed locally in your browser with no account and no tracking.