FranJAM Apps

ProAudio Tools 4.0

A sound level meter you can calibrate.

Sound level meter, real-time spectrum analyzer and tone generator for Android. Everything is measured on the phone, and nothing is sent anywhere.

Get it on Google Play See what's inside →

FreeAndroid 6.0 and laterSince 2013

Sound level meter reading 55.9 dB(C) on a needle gauge, with LCeq, max, min and LCpeak below

What's in it

Sound level meter in big-number view

Sound level meter

  • A and C frequency weighting (IEC 61672-1)
  • Fast, Slow and Impulse time weighting
  • LAeq, max, min and LCpeak
  • Needle or big-number view, 30 s history
  • Flip the display to point the mic at the source
Spectrum analyzer showing 1/3-octave bands in dB SPL with peak hold

Spectrum analyzer

  • 1/1, 1/3 and 1/6 octave, 25 Hz – 20 kHz
  • Levels in dB SPL with Z, A or C weighting
  • Peak hold, peak frequency and musical note
  • Freeze, and save a reference curve
Tone generator with a frequency dial set to 1.00 kHz

Tone generator

  • Sine, pink and white noise
  • Frequency dial, 20 Hz – 20 kHz
  • Type an exact frequency, or pick a preset
  • Level follows the phone's media volume

Accuracy

Every phone microphone has a different sensitivity, so out of the box readings are indicative. Hold the phone next to a reference sound level meter, play steady noise, and the app measures the offset for your exact phone. Weighting filters follow IEC 61672-1 and averages are true energy averages.

A phone is not a certified Class 1 or Class 2 instrument and should not be used for legal measurements. The first version of the app, released in 2013, was calibrated against a Brüel & Kjær Type 2236 Class 1 meter.

Privacy

The only permission is the microphone. Audio is processed in real time and never recorded, stored or uploaded. The app has no internet access, no analytics and no ads. Privacy policy

Roadmap

Night Log In development
Leave the phone running overnight and get a morning report of noise events: when they happened, how loud, and for how long. For neighbour, sleep and rental noise problems.
Calibration for more phones Ongoing
Popular models measured against a reference microphone, so readings are accurate without setup. Until your phone is covered, calibrate it yourself in the app.