# TestTone — Test Signal Audio Generator

> Test Signal Audio Generator (iPhone/iPad app by HTLab.)

- Source: https://appshunter.io/ios/app/testtone/id384289230 (this page in markdown: same URL + `.md`)
- Developer: [HTLab](https://appshunter.io/developer/384289233)
- Category: Music, Utilities
- Price: $1.99
- Age rating: 4+
- Requires: iOS 15.6 · 8 MB
- Languages: American English
- Released: 2010-07-31
- Data updated: 2026-08-11
- User reviews in markdown: https://appshunter.io/ios/app/testtone/id384289230/reviews.md

## What is TestTone?

This test signal generator is ideal for checking audio equipment and confirming audible frequency ranges.It can play sine, triangle, sawtooth, and square waves from 20 Hz to 20 kHz, as well as white noise and pink noise.

Features
	•	You can switch between preset frequencies, white noise, and pink noise using the frequency preset buttons.
You can also tap the frequency display area to enter any desired frequency manually.
The frequency can also be adjusted using the left/right buttons or by tapping the frequency display.
	•	Supports switching between sine, triangle, sawtooth, and square waveforms.
	•	Playback starts or stops by tapping the ON/OFF button or the icon at the top.

Note
Playing at high volumes may cause hearing damage or damage to your audio equipment. Please use with caution.

## Chart rankings

- #182 in Top Paid · Music (US App Store)


## Version history (last 5 releases)

### 1.5.1 — 2026-05-03

bugfix.

### 1.5 — 2025-11-06

Fixed a bug.

### 1,4 — 2025-10-28

In addition to sine waves, the app can now generate triangle, sawtooth, and square waves.
The user interface has also been updated.

### 1.3 — 2024-03-03

Fixed minor bugs

### 1.2 — 2024-02-22

UIを更新しました

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## More apps by HTLab

- [Time_Tools](https://appshunter.io/ios/app/time-tools/id1603823695)
- [EQ-Player](https://appshunter.io/ios/app/eq-player/id6752549499)
- [MultiWeb.View](https://appshunter.io/ios/app/multiwebview/id6753702786)
- [AudioAnalyzerHT](https://appshunter.io/ios/app/audioanalyzerht/id6754418363)
- [見る補聴器](https://appshunter.io/ios/app/id6754530523)

All apps by HTLab: https://appshunter.io/developer/384289233

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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 2026-08-11.*