Phone Tester shows what your iPhone or iPad is made of and how it is doing, using only what the device itself reports. It needs no account and no internet connection, and it reads and reports without cleaning, optimising or modifying anything on your phone.

System information covers the CPU, memory, storage capacity, battery health and charge cycles, display, cameras, installed sensors and network connectivity. Live charts follow CPU load, memory pressure, storage use and thermal state in real time.

Hardware and sensor tests double as an iPhone sensor check: level and compass, magnetometer, barometer, gyroscope, accelerometer, GPS accuracy, an iPhone proximity sensor test, ambient light and microphone input level, plus a dead pixel test for phone displays. The metal detector reads the magnetometer, the same sensor the compass uses, so it reacts to ferrous metal and to magnets. It is not an industrial detector and it will not find gold. The decibel reading is the microphone's own, uncalibrated, so it is good for comparing one room with another and not for a legal noise measurement.

A Home Screen widget shows CPU usage, memory use and available storage at a glance, and you can export a report of your device status as a PDF and share it by email or AirDrop, or keep it for your records.

It is useful for power users who want to see exactly what a device is doing, for developers checking hardware capabilities, and for people who like reading system specifications. The app can only show what the sensors of your own iPhone or iPad expose.