AudioTool

8.6.5

jjbunn

4.58

1,601 reviews

50,000+
Downloads

$7.99

AudioTool: Fully Featured SPL, dB and Sone Meter, plus Audio Spectrum Analyzer

AudioTool is a comprehensive SPL, dB and Sone meter with a real-time spectrum analyzer, built for serious acoustics work on Android. It carries regional MUSIC_AUDIO ranks (DE #19, FI #20, ID #20) and a strong 4.58 rating from 1,597 reviews. With 50,000+ total downloads and 230 downloads in the last 30 days, the app shows a long market presence across 5692 days.

Pros & Cons

Broad, professional-grade measurement toolkit (SPL, dB, Sone, spectrum, RT60, NC/NR)
Real-time data visuals with RTA store/load
ISO 1/3 octave calibration support for microphone response
Extensive signal generation options and waveform variety
Store/Load spectra for easy comparisons and calibration workflows

Steep learning curve due to the breadth of features
Performance and results depend on the underlying Android hardware and may not meet external standards in all cases
No mandatory cloud syncing; may feel heavy for casual users

About AudioTool

AudioTool is a music & audio app developed by jjbunn.

Download Statistics

AudioTool has been downloaded 62 thousand times. In the last 30 days, the app was downloaded 230 times. It is ranked #10 in music & audio.

User Ratings

AudioTool is rated 4.58 out of 5 stars. The rating is based on 1.6 thousand ratings.

App Information

AudioTool costs $7.99 to download. The APK download size is 3.43 MB. The latest version available is 8.6.5. The last update was on March 2, 2026.

Technical Requirements

AudioTool requires Android 5.0+ or higher. The app has a content rating of Everyone. The app has been available on Google Play October 2010.

Description

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.

Recent changes:
8.6.5 Adjust Generator layout to avoid Status Bar

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More data about AudioTool

Price	$7.99
Total downloads	62 thousand
Recent downloads	230
Rating	4.58 based on 1.6 thousand ratings
Ranking	Top ranked
Version	8.6.5
APK size	3.43 MB
Number of libraries	29
Designed for Android	5.0+
Suitable for	Everyone
Ads	NO ads

App Performance Report

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Alternative downloads for the AudioTool app

AudioTool compared with similar apps

Common keywords of similar apps

Audiotool Generator Octave Polarity Pink Sine Phase Screen Chart Recorder Checker Store Nc White Loudspeaker Select Load Files Set Response Shows Speaker Group Sone Leq Spectrogram Check Wideband Impulse Flat Criteria Square Triangle Sweep Log Ramp Spl Noise Audio Spectrum Signal Rta Calibration Frequency Meter Display Measurements Analyzer Features Peak

Keywords missing from this app

Sound Level Db Time Decibel Real App Device Usb Devices Measure Amplitude Fft Dba Measurement Levels Weighting Pressure Test Microphone Measuring Analysis Hearing Values Data Tool Mode Calibrated Pro Recent Mictester Reference User Professional Monitor Range

Google Play Rating history and histogram

Rating history

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Downloads over time

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AudioTool has been downloaded 62 thousand times. Over the past 30 days, it has been downloaded 230 times.

Changelog of AudioTool

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Developer information for jjbunn

jjbunn

jjbunn@gmail.com

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Comments on AudioTool for Android

★★★★☆ HK Federation · Dec 27, 2021

The app gets the job done. However, some of the tools lack explanation, and you'll have to dive into an online tutorial to learn what they do. The valley tool is unsophisticated and require multiple clicks if you want to refresh. Same for comparing multiple saved curves. The tool has lots of functionality though and is not missing any core features for audio tuning. Also, calibration is compatible with most RTA mics.

★★★★★ Tim Rolufs Sr. · Mar 18, 2024

Excellent app, even better with the Dayton audio imm-6 external microphone. Well worth the price. I used it at a local outdoor concert to measure the frequency ranges of the instruments being played and the spl of the concert was 105 near the speakers and a constant 100 at my seat. I look forward to using it in my basement, car and my son's truck.

★☆☆☆☆ Geocentric · Apr 1, 2025

It's not accurate at all from 30 HZ to 70 HZ or so. Reads extremely low from 30 to 60hz range compared to spectroid with same mic and position. My 30hz isn't almost 30 decibels less than peak bass. For speakers and earphones it is saying it has basically zero low end. High resolution set on "flat" and it's way off until around 70hz. Not my mic or me at all. Spectroid is more accurate and it's free. What is going on with high-end reading? Can't tune bass with this at all. Used calibration file too

★☆☆☆☆ M W · Jun 27, 2023

I have a Dayton Mic. A Motorola Stylus phone. I have no Audio Tool folder on my phone. I can only move my Calibration File to internal storage on my phone, I have no way of getting the Audio Tool Folder into my internal storage. I've saved files on the Audio Tool app but this does not help me find a way to move my calibration into Audio Tool. After Using 1/3 Octave Calibration I am unable to Load Cal. If I can't load my Cal File I'd like my money back please.

Google Play Rankings for AudioTool

Top rankings

Rank	Country	Category	List
21	United States	Music & Audio	Top Paid
97	Netherlands	Overall	Top Paid
10	South Korea	Music & Audio	Top Paid
10	Sweden	Music & Audio	Top Paid
11	Brazil	Music & Audio	Top Paid
116	Switzerland	Overall	Top Paid
121	Australia	Overall	Top Paid
122	Poland	Overall	Top Paid
14	Australia	Music & Audio	Top Paid
93	Switzerland	Applications	Top Paid

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Ranking history in Switzerland

Ranking history

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Technologies used by AudioTool

5 permissions · 29 libraries

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Trust & Safety: Permissions requested include MODIFY_AUDIO_SETTINGS, READ_EXTERNAL_STORAGE, RECORD_AUDIO, WRITE_EXTERNAL_STORAGE, and the DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION. AudioTool notes that performance depends on Android hardware and does not guarantee adherence to audio measurement or safety standards.

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More apps

AudioTool

AudioTool: Fully Featured SPL, dB and Sone Meter, plus Audio Spectrum Analyzer

Pros & Cons

About AudioTool

Download Statistics

User Ratings

App Information

Technical Requirements

More data about AudioTool

Alternative downloads for the AudioTool app

AudioTool compared with similar apps

Common keywords of similar apps

Keywords missing from this app

More from jjbunn

Google Play Rating history and histogram

Downloads over time

Changelog of AudioTool

Developer information for jjbunn

Share AudioTool

Comments on AudioTool for Android

Google Play Rankings for AudioTool

Top rankings

Ranking history in Switzerland

Technologies used by AudioTool