All 15 tools.
Each page names the sensor behind the tool, the units it reports, and where phone hardware stops being trustworthy.
Meters
4 tools
Sound level meter
Built-in microphone
A phone can show you useful relative sound levels — quiet room versus busy street versus power tool — but it is not a…
Metal detector
Magnetometer (the compass sensor)
A phone detects metal by watching its compass sensor for distortions in the magnetic field. That works well for iron…
Light meter
Ambient light sensor
A phone reports illuminance in lux using the small ambient light sensor near its earpiece. It is good for checking…
Audio spectrum analyzer
Built-in microphone
The spectrum analyzer splits what the microphone hears into frequency bands, so you can see which pitches are present…
Motion & position
6 tools
Bubble level
Accelerometer
The accelerometer senses which way gravity points, so a phone can act as a spirit level. It is genuinely useful for…
Compass
Magnetometer, tilt-compensated by the accelerometer
A phone finds north by measuring the Earth's magnetic field. It points to magnetic north rather than true north, and…
Accelerometer readout
Accelerometer
The accelerometer measures acceleration along three axes, including gravity. A phone lying still reads about 9.81…
Gyroscope readout
Gyroscope
The gyroscope measures how fast the phone is rotating, not which way it is facing. Many budget phones do not have one…
Magnetometer readout
Magnetometer
The magnetometer reports magnetic field strength in microtesla on three axes. Away from interference the total reads…
Gyro spin meter
Gyroscope
The spin meter converts the gyroscope's rotation rate into revolutions per minute. It works for anything the phone can…
Camera tools
2 tools
QR and barcode scanner
Camera
The camera reads QR codes and barcodes and shows you what they contain. On recent Android versions the built-in camera…
Camera heart-rate check
Camera with LED flash
Covering the camera and flash with a fingertip lets the phone see the colour change of blood pulsing through your…
System & utilities
4 tools
Flashlight with strobe and SOS
Camera LED (an output, not a sensor)
Drives the camera LED as a torch, with a strobe mode and an SOS pattern in Morse code.
Vibration tester
Vibration motor (an output, not a sensor)
Triggers the phone's vibration motor so you can check that haptics work and how strong they feel. Useful when…
Device and sensor dashboard
The Android sensor framework itself
Lists every sensor the device reports, with its vendor, range, resolution and power draw — the direct answer to…
Proximity sensor tester
Infrared proximity sensor
Tests the sensor that blanks your screen during calls. On most phones it reports only two states, near and far, rather…
Data logging
1 tool
Every sensor your phone has, in one app.
15 tools and a multi-sensor CSV logger. Free, with a one-time remove-ads purchase.
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