TestTone

$1.99

1.5.1for iPhone, iPad

HTLab

Developer

May 3, 2026

Update Date

Music

Category

App Store

Age Rating

Apps in this category do not contain restricted content.

Apps in this category may contain mild or occasional cartoon, fantasy or real-life violence, as well as occasional or mild adult, sexually suggestive or horrifying content and may not be suitable for children under 9 years of age.

12+

Apps in this category may contain occasional mild indecent language, frequent or intense cartoon or real-life violence, minor or occasional adult or sexually suggestive material, and simulated gambling, and may be for children under 12 years of age.

17+

You must be at least 17 years old to access this App.

Apps in this category may contain frequent and intense offensive language; Frequent and intense cartoon, fantasy or realistic violence: frequent and intense adult, scary and sexually suggestive subjects: as well as sexual content, nudity, tobacco, alcohol and drugs, may not be suitable for children under 17 years of age.

TestTone Screenshots

iPad

iPhone

About 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.