best · sample · Opus 5.5 · trial 001 of 100

What the model said

Blue — specifically a deep, slightly green-leaning blue like teal or petrol. It's calming, readable on both light and dark backgrounds, and it's the color most people name as their favorite in surveys across cultures.

That said, "best" depends on the job: for a terminal theme, a warm amber on dark is hard to beat for eye comfort; for a warning, nothing outperforms red.