Tech trained us to reach for blue. When I measured the accent color of hundreds of top sites, warmth was winning.
Ask anyone in tech to pick a "safe" accent color and they will say blue. It signals trust, it is calm, it never offends. It is also the reason so many products look the same. When I pulled the most saturated usable color from every palette in the library, blue led by a hair — and then warmth quietly overtook it.
Blue was the single most common accent family, but only just. Orange and red, added together, clearly outnumbered blue. Green, yellow, violet, teal and pink trailed well behind. So the honest summary is not "everyone uses blue" — it is "the confident brands increasingly reach for warmth, and the cautious ones reach for blue."
Warm colors advance; cool colors recede. An orange or red CTA physically pulls the eye forward, which is exactly what you want from the one element on the page that says "act here." Warmth also carries energy and appetite — it is why food brands run the boldest palettes on the web. Blue is the color of not wanting to be wrong. Warmth is the color of having a point of view.
A warm accent only works with restraint. The rule that holds across the whole dataset is scarcity: pick one accent and use it only on primary actions and links. The moment an accent leaks into borders, icons and backgrounds, it stops meaning "act here" and becomes decoration. A loud color used once per viewport reads as confident; the same color everywhere reads as chaos.
Test your candidate in three jobs before committing: as a solid button background (does text pass contrast on it?), as a text link inside a paragraph (still readable?), and as a thin focus ring (still visible?). Saturated mid-tones survive all three; pastels and neons usually fail one. I go deeper on palette structure in how the best sites choose colors.
If you take one thing from this: the safe choice and the forgettable choice are the same choice. Reach past blue.