AudioTool

4.6
1.62K reviews
50K+
Downloads
Content rating
Everyone
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About this app

SPL (deciBel) Meter featuring RT60, Leq, Sone, Spectrum Analyzer, Spectrogram, Chart Recorder, Signal Generator, Polarity Checker, and Mic calibration.

Recommended by "Sound and Vision" magazine. Loved by Audio Engineers worldwide: check out the Reviews!

Features: 1/1, 1/3, 1/6 & 1/12 octave RTA modes, Leq (wideband, Octave, variable duration), Sones (Loudness), RT60 (wideband, Octave), Peak Store, Spectrogram, Waterfall, Peak frequency, Impulse, Fast, Medium & Slow filters, Flat & A/C Weighting and film industry X Curve, Averaging, SPL Chart Recorder, Noise Criteria (NC and NR), White/Pink Noise, Sine, Square, Triangle, Sweep, Log Sweep, Warble, Ramp and Impulse signals & loudspeaker polarity checker, L/R select. RTA Store & Load, Hann windows, pinch to zoom, scroll to center.

Examples of recent updates (April 2019):
v8.0 New Feature: Load one or two stored spectrum files and display both alongside the realtime data.
v8.1 New Generator option: swap phase of Right stereo signal
v8.2 New Menu option "Set Resolution" allowing to set 4096, 8192, or 16384 sample lengths
v8.3 New 1/12 Octave RTA mode

Exclusive ISO 1/3 Octave Calibration - can correct for your phone's microphone response. Octave calibration discs are moved up or down to obtain a flat response, and match the overall SPL to that of an external meter. Save/Restore of Cal files (popular Dayton Audio iMM-6, MicW i436, also supported).

Use: gig measurements, home theater, acoustics, car, etc.

AudioTool FFTs sets of microphone samples. Aliasing reduced by Hann windowing. SPL calculated in realtime. Spectra may be saved, then loaded and displayed with the live spectrum. The "Store" button stores the current live spectrum - "Load" shows a list of stored spectra to select.

To hide the buttons, tap the screen. To restore them, tap again. To zoom the scale, pinch the screen. To move the scale, drag it up or down (left or right).

A pair of cursors can be shown: each can be moved to any position, and will display the SPL & time/frequency values there. The cursors can be turned on and off in the Menu.

The loudspeaker polarity checker can be used to check whether a loudspeaker is wired in phase: connect the AudioTool output to the speaker under test, select "Polarity" from the signal generator screen, then return to the RTA screen. If the speaker is out of phase (polarity reversed) AudioTool will show "Pol ---", otherwise "Pol +++" if the speaker is in phase.

The Noise Criteria function shows a set of NC contours overlaid on the 1/1 Octave RTA display and the calculated real time current NC value is also shown.

The Chart Recorder shows a moving trace of the SPL measurements over the last few minutes.

RT60 measurements (how much reverberation or echo there is in a room or hall) can be made using the "RT60" function, triggered using a loud clap (or similar) to or with Pink Noise from the AudioTool generator.

The Signal Generator generates White and Pink Noise, Sine, Square, Triangle and Ramp waves, Sine Linear and Log Sweeps, Warbles and Impulses. The generator uses multiple cycled buffers, refreshed randomly so ensuring truly random White and Pink noise.

The frequency accuracy of the Signal Generator is typically around 1%. Sine wave fidelity is good throughout most of the audio range. Other signals' leading and trailing edges will show ringing and decreasing frequency response artifacts in the upper ranges, depending on the cellphone being used.

The above description is a very terse version of the Online Manual, which may be accessed here:
https://sites.google.com/site/bofinit/audiotool

The friendly AudioTool Discussion Group can be used to request features, find/request Calibration files, or report problems. Feedback is always welcome:
http://groups.google.com/group/audiotool-discussion-group

Disclaimer: AudioTool's performance depends on your Android hardware, and is not guaranteed to meet any audio measurement or safety standards.
Updated on
Sep 1, 2023

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
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Ratings and reviews

4.7
1.49K reviews
Mark B
February 13, 2024
This is a great app with a deep toolbox for evaluating speakers & room acoustics. My only caveat is the accuracy of the app depends on the Sound Settings of your phone. I got a big "smile" response curve when I first measured a quality speaker. I later went into my phone settings and turned off all enhancers like Atmos, and chose "flat" for other eq options. NOW the signal generator outputs a flat signal. This needs to be mentioned in the app description.
6 people found this review helpful
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A Google user
November 19, 2018
Hello, do you think if it's possible to add smoothing feature? I've been using the app for measuring earphones but not having a smoothing feature (maybe there is one and I'm too dumb to find it). EDIT: average function does not get to level of smoothness that other apps i've known of (for example, arta/fftplot). check your email to see an example graph taken by arta.
8 people found this review helpful
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jjbunn
November 30, 2018
1/6 octave mode and averaging is an approximation to what is needed here. A future version of AudioTool will offer 1/12 octave mode, which should be a further improvement.
A Google user
December 4, 2019
I have been using this particular tool since inception. Light years ahead of any other. Highly and deadly accurate. It has everything you will need for Audio analyses. The ballistics of the display are far superior to any other audio app I have ever seen to date. I use it quite frequently. It does not crash, it is highly intuitive to use. 200 points on a scale of 1 to 200 points. I use it for A Range World Class commercial studio control rooms, analysis of space & Tuning of Big Speakers.
33 people found this review helpful
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What's new

Version 8.6 introduces a new method for importing Cal files (from e.g. Dayton Audio iMM6 microphones) into AudioTool. See online manual for instructions.