Audio Tool 4+

Performance Audio

Designed for iPad

    • 3.2 • 106 Ratings
    • $1.99



This amazing collection of professional audio tools is a must have for every audio professional, home theater enthusiast, recording engineer, concert goer, and anyone else who needs a fast and easy way to measure the sound levels around them, keep rhythm or tempo, turn their iOS device into a microphone, generate test tones, calculate recording times, or quickly find the definitions of commonly used audio terms.

"At only $1.99, it is possibly the best deal available in the world of pro audio gear… This iPhone essential for engineers, producers and musicians, will justify the price in a single use."
- Russ Long, Pro Audio Review

Audio Tool currently includes these 6 great tools for your everyday audio needs: Decibel Meter Pro, Microphone Pro, Bit Calc Pro and Audio Atlas!

Decibel Meter Pro:
Decibel Meter Pro is the hottest, most feature packed decibel meter on iTunes! With killer graphics optimized for the iPhone, the Retina display and the iPad! Decibel Meter Pro has been in the Top Utilities on iTunes since it's release! Download your copy today and find out why!

Tempo Pro:
Tempo Pro turns your iOS device into an amazing metronome! Tempo Pro is so fun to use, you will be creating custom beats, tempos and rhythms for hours! You can have anywhere from 1/4 to 12/8 time, and it's so easy and fun to adjust with our custom beats fader! Tempo Pro has vibrate, and camera flash options on supported devices! Start Tempo Pro and put it in your pocket or at the edge of your vision for a great silent metronome!

Microphone Pro:
Microphone Pro turns your iOS device into a microphone with a multi-function on/off button and volume control, making it great for use as a talk-back mic in live and recording applications, karaoke, public address, or anywhere you need an easy-to-use microphone.

Scope Pro:
Scope Pro is an Oscilloscope that lets you see the sounds around you! Scope Pro takes the audio signals from your built-in microphone and draws them to your screen!

Tone Generator Pro:
Tone Generator Pro automagically creates perfect Sine Waves, Square Waves, Triangle Waves, Sawtooth Waves, Reverse Sawtooth Waves, White Noise and Pink Noise!

Bit Calc Pro:
Got a recording session tonight? Got enough drive space?

Find out now! Our fun and quick interface places the information you need most, right at your fingertips. You can set your own defaults, input in any direction, flip your phone upside down, and wow your friends with Bit Calc Pro!

Audio Atlas
What did he just call you? Never look like a fool in the presence of an audio pro again! Our Audio Atlas can supply you with the definitions you need right now. Download Audio Tool and watch your brain grow!

Try Audio Tool, you'll love it!

What’s New

Version 2.0

This app has been updated by Apple to display the Apple Watch app icon.

iOS 9 support
Redesigned interface
Fixes a crashing problem on iPhone 6s and 6s Plus devices.
Change weighting & rotation modes on main screen.
iPhone 5, 6 and 6 Plus screen size support
Various bug fixes

Ratings and Reviews

3.2 out of 5
106 Ratings

106 Ratings

audio guy ,

Not quite there yet :(

While this latest update at least fixes the SPL meter that apparently stopped working when I upgraded to iOS9, the app is still quite buggy on my iPhone 6. Maybe it’s just me, but it feels pretty far from stable. For example, if I go to the tone generator and then change some of the settings, make it generate a tone, I can’t seem to get the tone to stop unless I make some changes to the scope. Pressing the play/pause button doesn’t seem to do anything but lower the level a bit. Maybe there are 2 generators and I’m only stopping one of them? Just feels buggy to me. But the graphics are quite great! I look forward to it being 100% stable!

Rocketath69 ,

A downgrade from previous version

Although there are some added features within the app I DEFINITELY MISS the manual "Tone Sweep" that was in the older version.
As a sound engineer this feature used to be quite handy in "live" situations where I could be mixing a band in a loud environment and listen to the frequency which was "loading up" in the room while holding the phone to my ear and manually scrolling the tone sweep until it matched. Then I'd just look at the phone and "voila" ...there's the trouble spot! Then I could address the specific frequency with the console parametric EQ.

The best part of this was just being able to sweep until the match was made BY EAR...
I have other analyzer apps but they are more full-band and they measure all the noise within the environment so the reading is not as precise as by ear.
HUGE MISTAKE in losing that feature, the new "sweeps" are nice in a quiet room where you have some time to spend alone with the PA system but NOTHING beat that old feature in my ear.
Also buggy now

motivo ,

Need some tuning

I like this app it does have some awesome reading tools, some i use some times and some i use i use three or four time a year. but they are useful tools that provide information that every person needs nowadays like the decibil reading. But the decibil reading tool need some tuning every time i try to used it it closes it self I delete and install it again but that didn’t work. so I’ll probably will have yo look for another decibil reading tool.

App Privacy

The developer, Performance Audio, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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