I asked Claude for a color palette for a finance app last month. It gave me six hex codes. They looked right in the chat window. In the actual UI, the body text sat on a primary color at about 2.8:1 contrast, which is unreadable for anyone who isn't 20/20, and the "dark mode" surface was a greenish gray that made every card look sick.

The model wasn't being lazy. It has no ruler. It can produce a hex value that "looks like" a dark teal, but it cannot compute that white text on that teal lands at 2.8:1, because nothing in the conversation tells it what the number is. Ask a better question and you get a nicer-looking guess. That's the ceiling.

So I built the ruler.

What PaletteGet is

PaletteGet is a small site with about 90 hand-picked palettes for three surfaces: mobile apps, web, and mini programs (the WeChat-style mini app format).…