# Tone Generator EX

> Audio tone generator with adjustable frequency, waveforms, and background playback. (iPhone/iPad app by An-Che Lee.)

- Source: https://appshunter.io/ios/app/tone-generator-ex/id1462601423 (this page in markdown: same URL + `.md`)
- Developer: [An-Che Lee](https://appshunter.io/developer/1314851569)
- Category: Utilities, Education
- Price: Free
- Rating: 4.79/5 from 439 App Store ratings · 51 written reviews indexed
- Age rating: 4+
- Requires: iOS 10.0 · 29 MB
- Languages: English
- Released: 2019-05-09
- Data updated: 2026-08-25
- Monetization: ad-supported
- User reviews in markdown: https://appshunter.io/ios/app/tone-generator-ex/id1462601423/reviews.md

## What is Tone Generator EX?

Tone Generator EX is an audio tone generator. It provides following features:

● Frequency range from 15Hz to 22KHz.
● Can play 4 different waveforms: Sine/Square/Sawtooth/Triangle 
● Auto-off timer.
● Playback running in background.
● Playback can be controlled from the notification drawer, lock screen or headset button without having to reopen the APP.
● Auto-pause on incoming call, alarm, etc.
● You can create your own presets.
● Set frequency by selecting a music note.

## Key features

- Frequency range 15Hz to 22KHz
- Sine, Square, Sawtooth, Triangle waveforms
- Auto-off timer
- Background playback
- Notification drawer control
- Create custom presets
- Set frequency by music note

## What do users think of Tone Generator EX?

Overall sentiment: positive

**Pros**

- 👍 Clean, intuitive, and elegant interface design
- 🎵 Precise frequency control with decimal accuracy
- 💰 Completely free with no ads or subscriptions
- ⚙️ Customizable A440 tuning standard adjustment
- 💾 Preset saving and loading functionality
- ⏱️ Built-in timer feature
- 🎹 Musical keyboard with note frequency display
- 🔊 Multiple waveform options (sine, square, sawtooth)
- ⚡ Instant response and smooth operation
- 🎯 Accurate tone generation verified by users

**Cons**

- 📉 Limited frequency range (minimum 15Hz, maximum needs extension)
- 🚫 No direct frequency input via typing
- ⏸️ No export functionality for generated tones
- 🔇 Clicking sounds during frequency adjustments
- 📱 No stereo output capability
- 🔄 Presets not automatically sorted numerically
- ⚠️ Hasn't been updated in over two years
- 🎚️ No duty cycle control for waveforms

**Commonly reported bugs**

- App crashes and won't play after initial use
- Requires unnecessary credit card information
- Potential compatibility issues with newer iOS versions

**Most requested features**

- Extend frequency range to 10Hz or lower (0-12Hz requested)
- Extend upper frequency range to support .4-12Hz adjustments
- Direct frequency input by typing instead of dial adjustment
- VST3/AUv3/desktop plugin version for DAW integration
- Frequency sweep functionality with adjustable speed
- Automated frequency sweep with smooth ascending/descending
- Export generated tones to audio files
- Stereo output capability
- Automatic numerical sorting of presets
- Play presets directly from list with individual play buttons
- Output level attenuator in dB
- Option to disable clicking sounds during frequency changes
- Dual tone generation (play two frequencies simultaneously)
- Paid ad-free version option
- Duty cycle control for square waves

## Recent user reviews (10 of 51)

All indexed reviews: https://appshunter.io/ios/app/tone-generator-ex/id1462601423/reviews.md

### 5/5 — Easy to use

*2026-06-13, version 2.4*

Does exactly what I need, quickly, easily, with no extra distractions.

### 5/5 — Good app

*2026-05-27, version 2.4*

Cool as !!!

### 5/5 — Perfect tone generator

*2026-05-26, version 2.4*

It also has a timer 99 minutes. Very impressive app

### 5/5 — Good app

*2026-03-21, version 2.4*

Cool as !!!try it

### 4/5 — Question

*2026-01-11, version 2.4*

How can we adjust for .4-12 hertz ? That’s would be so cool if there was an up date

### 5/5 — The Best Tone Generator I’ve Ever Used.

*2025-10-22, version 2.4*

I’m a musician, and this app has become one of my go-to tools. It’s not just another tone generator — it’s actually useful. The built-in keyboard that lets you hear each note and see its exact frequency is brilliant. It’s perfect for composing, tuning, referencing pitches, and reaching that low-end response — everything just works the way it should. 

Most tone apps feel like technical utilities. This one feels musical. The layout is clean, intuitive, and it reacts instantly. Whoever designed it clearly understands how musicians think and work.

I have a request however door the developer. No, it’s a plea. 
If the frequency range could be extended to 10hz and I’d love to see a VST3 / AUv3 / desktop plugin version of this. It’d be a perfect addition to any DAW — not just for testing tones.

This app is accurate, reliable, and free — easily the best tone generator I’ve found on mobile. Don’t change the formula; just give it a plugin version and it’s perfect. Please oh please.

### 5/5 — Awesome app

*2025-10-11, version 2.4*

It does what it says and it does it just fine. I use it with pair of bone conductor speakers and I can feel the vibration on my skin. The timer feature is great too. Thanks for this app and keeping it free.

### 5/5 — So far it works great

*2025-06-17, version 2.4*

Does what it says!  No ads..

### 5/5 — Great app

*2025-06-05, version 2.4*

I have only written a few reviews since getting an Iphone 4s and this app is awesome. I hope it gets updated to be able to conduct sweeps and save them. Its just such a well designed app and free.  Awesome!

### 5/5 — Great

*2025-05-19, version 2.4*

It’s awesome. Wish it went a little lower

## Frequently asked questions about Tone Generator EX

### What does Tone Generator EX do?

Tone Generator EX is an audio tone generator that allows you to create a wide variety of sound frequencies. It supports a broad frequency range from 15Hz to 22KHz and can play four different waveforms: Sine, Square, Sawtooth, and Triangle.

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

Key features include a broad frequency range, support for four distinct waveforms, an auto-off timer, and background playback. You can also control playback from your notification drawer or lock screen, and it automatically pauses for incoming calls or alarms. The app allows you to create custom presets and set frequencies by selecting music notes.

### Is Tone Generator EX free to use?

Yes, Tone Generator EX is free to use. The application is supported by advertisements.

### Can I use Tone Generator EX while using other apps?

Yes, playback can run in the background, meaning you can continue to use other applications on your device while the tone is generating. The app also supports playback control from the notification drawer, lock screen, or headset button without needing to reopen the app.

### What are some common use cases for Tone Generator EX?

This app is useful for various purposes such as audio testing and calibration, tuning instruments, or for experimental sound design. Users can also create custom presets for frequently used tones or set frequencies based on musical notes for easier reference.

## Version history (last 5 releases)

### 2.4 — 2021-02-02

New musical note selection UI.

### 2.1 — 2019-05-27

Minor bug fixes.

### 2.0 — 2019-05-25

New "frequencies of music notes" dialog.

### 1.1 — 2019-05-10

1. New save/load presets function.
2. Correct the link for 'rate this app' menu.

### 1.0 — 2019-05-08

No release notes.

## Apps similar to Tone Generator EX

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Frequency Sound Generator App](https://appshunter.io/ios/app/frequency-sound-generator-app/id1238160553) | 4.5 (4,832) | Free | Utilities |
| [Audio Function Generator](https://appshunter.io/ios/app/audio-function-generator/id768229610) | 4.7 (2,183) | Free | Utilities |
| [Sonic Pitch Sound Generator](https://appshunter.io/ios/app/sonic-pitch-sound-generator/id1187701748) | 4.5 (1,821) | Free | Utilities |
| [Tone Generator Speaker Cleaner](https://appshunter.io/ios/app/tone-generator-speaker-cleaner/id1671426872) | 3.6 (18) | Free | Utilities |
| [Frequency: Sound Generator](https://appshunter.io/ios/app/frequency-sound-generator/id6474342664) | 4.7 (340) | Free | Utilities |
| [Generate Frequency Sounds Hz](https://appshunter.io/ios/app/generate-frequency-sounds-hz/id1516257706) | 3.6 (14) | Free | Utilities |

## More apps by An-Che Lee

- [Metronome EX](https://appshunter.io/ios/app/metronome-ex/id1314851570)
- [Ambience EX - White noise](https://appshunter.io/ios/app/ambience-ex-white-noise/id1457949916)

All apps by An-Che Lee: https://appshunter.io/developer/1314851569

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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 2026-08-25.*