<b>"Red buttons convert better than green." [BUSTED]</b>

<b>"Red buttons convert better than green." [BUSTED]</b>

The famous "red beat green by 21%" test from 2011 went viral and spawned a decade of button-color cargo cult.

The boring truth: that test had a green button on a green-heavy page. Red won because it had <i>contrast</i> and the rest of the design didn't fight it. The color was irrelevant — the isolation was everything. Run the same test on a red-themed page and green wins.

Button color has no universal conversion value. Visual hierarchy does.

What the advice skipped: pick the one color on your page nothing else uses, and reserve it for the primary action. The button should be the only thing wearing that jacket in the room.