# Audio Signal Generator — Tone and Noise Test Utility

> Utility app for generating various audio test tones and noise signals. (iPhone/iPad app by Media Punk Studios.)

- Source: https://appshunter.io/ios/app/audio-signal-generator/id543661843 (this page in markdown: same URL + `.md`)
- Developer: [Media Punk Studios](https://appshunter.io/developer/432317871)
- Category: Utilities, Music
- Price: Free with in-app purchases
- Rating: 4.20/5 from 85 App Store ratings · 105 written reviews indexed
- Age rating: 4+
- Requires: iOS 11.0 · 13 MB
- Languages: American English
- Released: 2012-08-01
- Data updated: 2026-06-10
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/audio-signal-generator/id543661843/reviews.md

## What is Audio Signal Generator?

Signal Generator is an app that produces audio test tones. The basic app produces sine waves, and it can be extended and customized (via in-app purchases) to produce white noise, pink noise, frequency sweeps, and (on iPhone 4 and better) square waves, sawtooth waves, and triangle waves.

• Free Tone Generator. The app includes a free sine wave generator that generates signals from 20 Hz to 20 kHz, with a 48 kHz sample rate, 16-bit samples, and 96 dB of dynamic range. Frequency control via logarithmic knob or keyboard input.

• Pro Tone Generator. (Optional in-app purchase). Extends the frequency range down to 1 Hz, and adds stereo control and buttons to increment the frequency in steps. Anti-aliased square waves, sawtooth waves, and triangle waves are generated with aliasing kept to -54 dB or less. 

• Noise Generator. (Optional in-app purchase). Produces white noise, pink noise, and brown noise. Pink noise falls off at 3 dB per octave (±1 dB). Brown noise falls off at 6 dB per octave. Option for stereo uncorrelated noise, or mono correlated noise.

• Frequency Sweeps. (Optional in-app purchase). Adjustable start and stop frequencies. Linear or logarithmic sine wave frequency sweeps. Single shot sweeps, repeating upward sweeps, and upward/downward sweeps.

This app can be used to:

• Test Speakers and Headphones
• Balance your Home Theater System
• Tune Your Car Audio System
• Mask Environmental Noise
• Burn In Headphones
• Tune Musical Instruments

## Key features

- Sine wave generation
- White and pink noise generation
- Frequency sweeps
- Square, sawtooth, and triangle waves
- Stereo and mono output
- Adjustable frequency control

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Noise Generator | $2.99 | one-time |
| Tone Generator Pro | $2.99 | one-time |
| Sweep Generator | $2.99 | one-time |


## Recent user reviews (10 of 105)

All indexed reviews: https://appshunter.io/ios/app/audio-signal-generator/id543661843/reviews.md

### 5/5 — Many Uses

*2025-09-21*

This is great for testing PA systems, individual speakers, crossovers, finding rattles/buzzes in speakers or studios or showing off your subwoofers to friends & neighbors.
GET IT!!

### 2/5 — Major Problem

*2025-03-10, version 1.8.0*

Hey, team.  I have tried a reinstall, to no avail.  Menu screen is blank.  Once was a great app.  This year has been glitchy.   Ty

### 1/5 — User interface is trash

*2025-01-01, version 1.8.0*

Paid for ad free and sweep function.
Selecting menu goes to blank screen.
Ap stops functioning after this.
Also ads keep appearing.
Total waste of time and money…

### 1/5 — not working

*2024-12-14, version 1.8.0*

Ios 18 on ipad it now does now give tone out

### 3/5 — Needs update

*2024-07-13, version 1.8.0*

Was good for years until now on new iPhone models it glitches out and the sound sweep can sound sound alien like. Only the clean sweeps will work for me no my using either left or right sweeps.

### 5/5 — Murdered Out Baggers LLC.

*2024-01-12, version 1.8.0*

I Customize Harley Davidson motorcycles for a living and a lot of them want high end stereo systems on them. So I use it with a few SMD tools and an Audio Control DM-RTA to adjust the DSP on the system for the best overall sound you could want. I bought 3 different ones. The Tone tester and the pink noise generator as well as the sweep tone generator. Love them all. They don’t time out or stop for any reason.

### 4/5 — Speaker test

*2023-08-27, version 1.8.0*

Great for a quick speaker test. 
Is the output voltage constant over 20-20k?

### 5/5 — College

*2022-09-21, version 1.8.0*

This is an amazing app especially when pursuing a career in audio engineering/music production

### 1/5 — Didn’t work

*2022-02-10, version 1.8.0*

Couldn’t get it to make any sound at all on iPhone 12 Pro

### 5/5 — 5 years of testing and tuning

*2022-01-05*

I’ve had this app for five years I am a car audio installation technician. I have use this app to tune thousands of installs. It is definitely worth purchasing the extra add-ons. I don’t think there would be another app I would ever want to use for Signal generation and tone generator

## Frequently asked questions about Audio Signal Generator

### What does the Audio Signal Generator app do?

This app generates various audio test tones and noise signals. The basic version offers sine waves, while in-app purchases unlock features like white noise, pink noise, frequency sweeps, and different wave types such as square, sawtooth, and triangle waves.

### What are the key features of the Pro Tone Generator?

The Pro Tone Generator, available via in-app purchase, extends the frequency range down to 1 Hz. It also adds stereo control, buttons for incremental frequency adjustments, and generates anti-aliased square, sawtooth, and triangle waves with minimal aliasing.

### How is the app monetized?

The app is free to download and use for basic sine wave generation. Additional features like advanced wave types, noise generation, and frequency sweeps are available through optional in-app purchases.

### What are some common use cases for this app?

Users can employ this app to test speakers and headphones, balance home theater systems, tune car audio systems, mask environmental noise, burn in new headphones, and tune musical instruments.

### Is this app compatible with older iPhones?

The app can generate square waves, sawtooth waves, and triangle waves on iPhone 4 and better. The core sine wave generation and noise features are generally available across compatible devices.

## Version history (last 5 releases)

### 1.8.0 — 2019-12-03

Play/pause function is independent of gain settings.
Frequency sweep time extended from 0.2 to 60 seconds.
Noise source can be set to correlated (mono) or uncorrelated (stereo).
Frequency range boundaries conform to ISO frequencies.

### 1.7.3 — 2015-07-08

Fixed a crash that would occur during start up under certain conditions. Fixed the sweep mode button forgetting its last state.

### 1.7.2 — 2015-01-24

Fix for a UI issue. (A number of buttons performed the wrong function. Thanks for the feedback!)

### 1.7.1 — 2015-01-11

Slower frequency sweeps. Up to 32 seconds.

### 1.7.0 — 2014-12-16

Extended the frequency range to include infrasonic frequencies as low as 1 Hz for the Tone Generator, and 2 Hz for the frequency sweep. Frequency sweeps now include an up/down mode and a real-time frequency display. Also includes other various improvements.  Updated for iOS 8.

## Apps similar to Audio Signal Generator

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Audio Function Generator](https://appshunter.io/ios/app/audio-function-generator/id768229610) | 4.7 (2,144) | Free | Utilities |
| [Noise Generator: Full Spectrum](https://appshunter.io/ios/app/noise-generator-full-spectrum/id1206450560) | 4.7 (1,956) | Free | Utilities |
| [Frequency Sound Generator App](https://appshunter.io/ios/app/frequency-sound-generator-app/id1238160553) | 4.5 (4,832) | Free | Utilities |
| [Frequency: Sound Generator](https://appshunter.io/ios/app/frequency-sound-generator/id6474342664) | 4.7 (340) | Free | Utilities |
| [Tone Generator Speaker Cleaner](https://appshunter.io/ios/app/tone-generator-speaker-cleaner/id1671426872) | 3.6 (18) | Free | Utilities |
| [Sonic Pitch Sound Generator](https://appshunter.io/ios/app/sonic-pitch-sound-generator/id1187701748) | 4.5 (1,821) | Free | Utilities |

## More apps by Media Punk Studios

- [Nebulous Theremin Synth](https://appshunter.io/ios/app/nebulous-theremin-synth/id806448928)

All apps by Media Punk Studios: https://appshunter.io/developer/432317871

## Related topics

[audio signal generator](https://appshunter.io/ios/topics/audio-signal-generator) · [audio test tone generator](https://appshunter.io/ios/topics/audio-test-tone-generator) · [car audio tuning](https://appshunter.io/ios/topics/car-audio-tuning) · [audio test tones](https://appshunter.io/ios/topics/audio-test-tones) · [audio frequency generator](https://appshunter.io/ios/topics/audio-frequency-generator) · [pink noise generator](https://appshunter.io/ios/topics/pink-noise-generator)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*