Blog

Notes from the arms race.

What actually gets a profile flagged, how agents drive a real browser, and the detector runs behind our claims.

6 min

1,011 text measurements: how a signup flow proves your browser is lying about its OS

Detection stopped asking which fonts you have and started measuring how wide they are. A missing font is not hidden: it renders in the fallback and measures exactly like a family nobody has ever installed. If your persona claims Windows on a machine that is not Windows, that is a one-line contradiction, and no amount of aged profiles or clean residential exits talks you out of it.