# Audio Function Generator — Frequency and Signal Generator

> Powerful and intuitive audio function and signal generator for tone creation and testing. (iPhone/iPad app by Thomas Gruber.)

- Source: https://appshunter.io/ios/app/audio-function-generator/id768229610 (this page in markdown: same URL + `.md`)
- Developer: [Thomas Gruber](https://appshunter.io/developer/342699861)
- Category: Utilities, Music
- Price: Free with in-app purchases
- Rating: 4.70/5 from 2,191 App Store ratings · 271 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.5 · 14 MB
- Languages: American English, French (France), German (Germany), Japanese, Korean, Brazilian Portuguese, Chinese (Simplified, China), European Spanish
- Released: 2013-12-09
- Data updated: 2026-09-02
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/audio-function-generator/id768229610/reviews.md

## What is Audio Function Generator?

This is the highly recommended and praised Function Generator App - an amazingly great and powerful tone generator. Enriched with a vast amount of features yet it is extremely intuitive and designed for simplicity.

Get to know this great App now! It is very well maintained and has received considerable upgrades over the past years.

So, … what can you do with this App?

• PLAY TEST TONES Sine, Rectangular, Triangular and Sawtooth.

• PLAY FREQUENCY SWEEP TEST TONES in both directions (minimum to maximum frequency and maximum to minimum frequency). 

• PLAY VOLUME SWEEPS (from minimum to maximum volume).

• Try the SWEEP REPEAT / WOBBLE function.

• Try the MUSIC TONES PLAYBACK.

• Experiment with the huge FINE TUNE SELECTON, PRESETS SELECTION!

• Or create your own CUSTOM PRESETS!

• And SAVE an endless amount of CONFIGURATIONS (Frequency, Sweep, Noise) for later quick access and direct playback function.

• Even play back different kinds of NOISE – White, Pink, Violet, Grey, Brown, Blue is also supported.

The Function Generator is AMAZINGLY INTUITIVE and SIMPLE to use!


AND THESE ARE THE ADVANCED SETTINGS/FEATURES (upgrade to PRO required):
=> Extending The Frequency Range (1Hz - 21kHz)
=> Extending The Sweep Times (0.1s - 600s)
=> Changing Min/Max Slider Frequency Ranges 
=> Changing Max Sweep Time Slider Range
=> Changing Signal Amplitude
=> Enabling Of The Sweep Repeat / Wobble Function
=> Frequency Slider Setting to Linear or Logarithmic
=> Left/Right Channel Individual Selection
=> Permanently Saving Custom Presets
=> Saving Of Endless Number Of Audio Configurations
=> Phase Out Setting (custom phase shift of the generated signal)
=> BPM (Beats per Minute) Feature
=> Dual Function Generator
=> MultiTone Generator (playback of up to eight individual tones)
=> Background Theme Selection (Light/Dark)

Check out the tutorial page: www.ee-toolkit.com/audio-function-generator

## Key features

- Generate sine, square, triangle, and sawtooth tones
- Frequency and volume sweep generation
- Noise generation (white, pink, violet, etc.)
- Custom preset creation and saving
- Extended frequency range (PRO feature)
- Multi-tone playback (PRO feature)

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Upgrade to PRO | $12.99 | one-time |


## What do users think of Audio Function Generator?

Overall sentiment: neutral

**Pros**

- 👍 Great app
- 🎶 Helps with Tinnitus
- 💯 Best app I've paid for
- 🔍 Highly recommended
- 🎨 Attention to detail
- 🔧 Useful for testing and calibrating
- 🚀 Excellent functionality
- 🤖 Intuitive interface
- 🎛️ Comprehensive features

**Cons**

- 🐛 Crashes
- 💰 Deceptive/Money hungry
- 🔒 Basic features paywalled
- 🔒 Limited without paying
- 🔒 Removed functionality to push paid version
- 🔒 Frequencies locked behind paywall
- 🔋 High battery consumption

**Commonly reported bugs**

- Crashes on launch
- Volume slider issues
- Airplay not working
- Sound distortion when display is active

**Most requested features**

- Add download/save feature for custom sounds
- Improve sweep function (continuous mode, better frequency control)
- Add more multi-frequency rows
- Implement 432Hz base frequency option
- Add phase control for noise generators
- Improve accessibility (VoiceOver support)

## Recent user reviews (10 of 271)

All indexed reviews: https://appshunter.io/ios/app/audio-function-generator/id768229610/reviews.md

### 1/5 — Under 100hz locked

*2026-08-17*

That looks beautiful, but the free version doesn't give you anything under 100 Hz. Was going to buy some PA speakers and wanted something to test, but without this functionality, I'll never think about upgrading.

### 5/5 — 👍🏼🔥

*2026-07-21, version 9.2.0*

Спасибо, это то что я искал.

### 5/5 — Well done!

*2026-07-08, version 9.2.0*

This app is very well designed and useful for an array of tasks.  I love it and highly recommend it!

### 1/5 — Worst app I’ve ever tried in my whole life

*2026-05-10*

This is the most poorly designed app I’ve ever seen in my whole life. I work with software and apps all the time. I’ve seen all kinds, but this takes the cake as the absolute worst. Horrible user experience. There is literally no way to just set a frequency and have it play indefinitely. That’s not even an option. The frequency constantly rises when you said it at one thing and it gets higher and higher and then it cuts off after a certain amount of time. There is absolutely no option to make the frequency stay steady. There is no option to make it play indefinitely. All of the commands and the buttons are grouped in a horrible way

**Developer response:** Hello there! You are describing one of the App’s most powerful features: the Sweep mode :)

A sweep generator is supposed to continuously change frequency over time — that’s literally its job. And the Audio Function Generator does this extremely well, as you can see from the other reviews. 

What you were looking for was the fixed/static tone mode, the first tab in the App, where the frequency stays constant indefinitely (or until your dog starts judging you).

We do appreciate the passionate feedback though — few things in life are as dramatic as accidentally discovering how a sweep generator works.

### 1/5 — A. F. G.

*2026-03-28, version 9.1.0*

Can’t do anything without upgrading to the paid subscription.

### 5/5 — VERY SOLID APP!!

*2026-02-14, version 9.0.1*

Seemingly almost zero complaints aside from the stop playback timer not functioning as intended. Other than that a very solid and a highly recommended purchase for those wanting such utility!

### 5/5 — Additional Functionality Suggestion

*2026-02-02*

Add notch filter to noise function, so that app can potentially be used for tinnitus relief. Include adjustable frequency for upper and lower drop off points and Q adjustability.

### 2/5 — Kein 50 Hz Test mehr

*2026-01-28, version 9.0.1*

Leider muss man das App kaufen um einen soundtest unter 100 hz machen zu können. Das ging vor einiger Zeit noch!

### 4/5 — why TWO signal generators, big $$$

*2025-12-19, version 8.4.0*

hey Thomas!  greetings from Cowgary! great work!! amazing functionality, flexibility, usability and excellent engineering in these apps! i have used three of your apps without knowing you were the author of each. i'm a journeyman, technician, technologist, engineer, musician, editor, dev, etc, so its a no-brainer i would find and use your apps. Outstanding work! All your apps deserve 5 STARS across the board, no question! however i must apologize that i have not used your TWO signal generators enough, less than 10 hours, to know why you have two, and even worse today when i need a full-featured PRECISION SIGNAL GENERATOR i see they are both a little pricey ($20+can on appstore) and the package deal of $36+can for two generators and a circuits app (i'm not likely to use) is really no bargain for me when i only need one generator. So i can't decide which one to purchase until i learn much more about both of them.....  and in the back of my mind i am wondering if there are any other precision signal generators that will do the peculiar job i need (spectral sweeps) and don't cost as much. I have a lot going on in the lab so my frequency sweeps project will have to be back-burnered for now. the last thing i need is to blow $24can on the wrong generator app. (yeah, i already have at least ten signal generator apps)

### 4/5 — Great app

*2025-11-07*

Thanks for the help with creating this app, it’s been a beautiful way to enhance my knowledge of frequency and help me discover more possibility with the world around me. keep up the good work, 
With much love and resolve, Nige

## Frequently asked questions about Audio Function Generator

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

This app functions as a powerful and intuitive tone and signal generator. It allows users to create and play various audio test tones, including sine, rectangular, triangular, and sawtooth waves. You can also generate frequency and volume sweeps, experiment with different types of noise, and save custom presets for quick access.

### What are the key features of the Audio Function Generator?

Key features include the ability to play standard test tones, perform frequency and volume sweeps, generate various noise types, and create/save custom presets. Advanced features, available with a PRO upgrade, extend the frequency range, sweep times, allow for individual channel selection, and enable multi-tone playback.

### Is the Audio Function Generator free to use?

The app is free to download and use with its core functionalities. However, certain advanced features, such as an extended frequency range, longer sweep times, and multi-tone generation, require an upgrade to the PRO version.

### What kind of tones can I generate with this app?

You can generate several fundamental test tones, including Sine, Rectangular, Triangular, and Sawtooth waves. The app also supports playing music tones and various types of noise like White, Pink, Violet, Grey, Brown, and Blue.

### Who would benefit from using the Audio Function Generator?

This app is beneficial for a wide range of users, including audio engineers, technicians, hobbyists, and musicians who need to test audio equipment, calibrate sound systems, or experiment with sound frequencies. Its intuitive design makes it accessible for both beginners and advanced users.

## Version history (last 5 releases)

### 9.3.0 — 2026-09-02

User interface improvements for the DualTone generator
Sequence Playback (MultiTone) UI optimisations
Dark Mode improvements

### 9.2.0 — 2026-05-30

Smaller fixes and improvements

### 9.1.0 — 2026-02-28

Fantastic news for all the Sweep fans! The new version of the App introduces an enhanced AudioEngine that supports advanced Sweep options. An additional menu has been added to the Sweep Tab for a combined Volume+Frequency Sweep combination.

All Sweep Features:
- Frequency Sweep
    - low => high, high => low
    - repeat mode, siren mode
    - fixed or variable steps
    - custom sweep time
- Volume Sweep
    - set amplitude at start, set amplitude at stop
    - repeat mode, siren mode
    - custom sweep time
- Combined Frequency+Volume Sweep
    - low => high, high => low
    - set amplitude at start, set amplitude at stop
    - repeat mode, siren mode
    - fixed or variable steps
    - custom sweep time

In addition the new AudioEngine now supports improved on/off frequency ramping and a better handling of gain changes (smoothing).

Other changes/improvements:
- issue with playback Stop Timer fixed
- catching corner cases when closing app and stopping playback (soft ramp down)

### 9.0.1 — 2026-01-19

• Improvements when running the App on macOS / Apple Silicon
• Sweep improvements while repeat is active (frequency dependent volume ramping)
• added crossfading support for the balance setting

### 9.0.0 — 2026-01-08

• This update introduces major enhancements to all the popovers across the app, with a refreshed design throughout the app that better aligns with the visual improvements introduced in iOS 26.
• All popovers received a major design overhaul, better readability, larger content and improved usability
• In addition to the updated UI, we’ve also included several smaller fixes and performance improvements to ensure the best App experience.

## Apps similar to Audio Function Generator

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Sonic Pitch Sound Generator](https://appshunter.io/ios/app/sonic-pitch-sound-generator/id1187701748) | 4.5 (1,821) | 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 |
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| [Noise Guru: Decibel Meter](https://appshunter.io/ios/app/noise-guru-decibel-meter/id6444836813) | 4.6 (299) | Free | Utilities |
| [Frequency Sound Wave Generator](https://appshunter.io/ios/app/frequency-sound-wave-generator/id6478711398) | 4.8 (75) | Free | Utilities |

## More apps by Thomas Gruber

- [EE ToolKit PRO](https://appshunter.io/ios/app/ee-toolkit-pro/id368780426)
- [EE ToolKit](https://appshunter.io/ios/app/ee-toolkit/id391792609)
- [EE ToolKit PRO for iPad](https://appshunter.io/ios/app/ee-toolkit-pro-for-ipad/id393145367)
- [Audio Function Generator PRO](https://appshunter.io/ios/app/audio-function-generator-pro/id895074703)
- [Resistor ToolKit, Color Codes](https://appshunter.io/ios/app/resistor-toolkit-color-codes/id1058581945)

All apps by Thomas Gruber: https://appshunter.io/developer/342699861

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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 2026-09-02.*