Is it vibe
coded?

Paste a website. We read its HTML, CSS and JavaScript and look for the design habits AI tools fall back on when nobody steers them: the purple gradients, the cream-and-terracotta Claude look, the badge above the headline, the three icon cards, the em dashes.

This is a guess from design fingerprints, not proof. Plenty of people hand-build sites with Tailwind and Inter, and a well-steered AI leaves almost no trace. If the page names the tool that built it (Lovable, v0, Bolt and friends often do), we say so.