Methodology
Each test labels its evidence as observed, browser-reported, estimated or user-confirmed. Every result page explains the browser API used and what that method cannot prove.
Our operating principle
Utility, privacy clarity and diagnostic usefulness come first. Every browser measurement is labelled by precision, every sensitive permission follows an explanation, and unsupported capability is never presented as hardware failure.
What the browser can prove
DeviceDoctor reports only what the current browser session can observe. Browser-reported, estimated and user-confirmed results include their limits and a practical next step.