2026-03-12
Diagnostics stay on the device
A phone diagnostic is useful only if people trust it. Project-X runs the checks that a browser can actually perform β battery, storage estimate, network latency, CPU timing, display facts, and sensor availability β on your device.
When you save a run, the account stores the score, a short summary for each category, and the guides we recommended. It does not store a serial number, IMEI, advertising ID, or the raw sensor stream.
If a browser cannot expose a signal, the category is marked unsupported instead of being invented. A desktop Chrome window will not pretend to have a phone battery.