# Frequency Generator

Set a frequency, choose a waveform and press play. The generator holds one steady tone in the browser, names the closest note, and takes presets, octave jumps and a volume control.

> Canonical: https://aimusicis.com/frequency-generator

## A frequency generator that holds one steady tone

A single tone is a reference: it shows whether a speaker rattles, whether two headphones match, and which low notes a room will carry. This generator keeps one oscillator running while you change the frequency, the waveform and the volume underneath it.

### The whole audible range on one slider

The slider covers 20 Hz to 20 kHz and travels by an equal distance per octave, so the bottom of the range is as easy to land on as the top.

### Four waveforms, changed while it plays

Sine, square, triangle and sawtooth come from the browser's own oscillator, and the waveform can be switched without stopping the tone.

### Presets, octave jumps and a note name

Common reference frequencies are one press away, the octave buttons halve or double the current tone, and the nearest note is named as you move.

## Play a tone in three steps

### Choose a frequency

Drag the slider, press a preset, or type the number. The plus and minus buttons move by one percent for fine tuning.

### Choose a waveform

Sine is the purest tone. Square, triangle and sawtooth add harmonics that make the pitch easier to place on a small speaker.

### Set the volume and press play

The tone starts at a quarter volume. Stopping it fades the sound out and closes the browser's audio context.

## Range, waveforms and levels

### 20 Hz to 20000 Hz

The range the generator covers, from the bottom of a subwoofer to the top of what an ear can follow.

### 4 waveforms

Sine, square, triangle and sawtooth, all produced by a single oscillator.

### 7 presets

174, 285, 396, 440, 528, 1000 and 8000 Hz are one press away, and the octave buttons move from any of them.

### 25% default volume

The tone starts below half level, loud enough to hear and quiet enough not to clip a small speaker.

## Who plays a test tone

### Anyone checking a speaker or headphones

Sweep the frequency and listen for a rattle, a gap at the low end, or a channel that drops out before the other one.

### Musicians tuning by ear

Play 440 Hz as a reference, or use the octave buttons to reach the register of the instrument you are tuning.

### Producers testing a room

Play a low tone and walk the room to find where a bass note builds up and where the same note disappears.

## Tools related to Frequency Generator

### [Key & BPM Finder](https://aimusicis.com/key-bpm-finder)

### [Audio Spectrum Analyzer](https://aimusicis.com/audio-spectrum-analyzer)

### [Reverb Calculator](https://aimusicis.com/reverb-calculator)

### [Chromatic Tuner](https://aimusicis.com/tuner)

## Frequency Generator FAQ

### What frequencies can the frequency generator play?

The frequency generator covers 20 Hz to 20000 Hz, which is the range most people can hear, and moves in steps of one hertz anywhere inside it.

### Which waveforms does the frequency generator offer?

The generator offers sine, square, triangle and sawtooth, the four waveforms a browser oscillator can produce. Noise is not among them, because noise needs a different kind of source.

### What is a steady tone useful for?

A steady tone is a reference anyone can check against. It reveals a rattling speaker, a mismatch between two headphones, and the frequency at which a room starts to boom.

### How loud does the frequency generator play?

The tone starts at 25 percent volume and can be raised to full. The generator caps the output gain below full scale so a laptop speaker distorts less at the top of the range.

### How does the nearest note readout work?

The note readout names the closest equal-tempered note to the frequency you set, using A4 at 440 Hz as the reference, so 440 Hz reads A4 and 220 Hz reads A3.

### Is a test tone safe to play at full volume?

A test tone is safe at a low level and less so as the volume rises, because a sustained tone at full volume can damage hearing. The tone plays through the browser and cannot be recorded or exported, so a quiet level and a short test are the safer habit.

### Why is there no sound when I press play?

Browsers allow audio only after a user gesture, so the generator opens its audio context on the play press itself. If the tone is still silent, check the system output and the volume control on the page.

### Does the frequency generator use credits or an account?

Credits and sign-in are not involved at all: the tone is produced in the browser, so nothing leaves the page while it is playing.

### How many credits does Frequency Generator use?

Frequency Generator runs in the browser and draws zero credits.

## Keep the tone as your reference

Play 440 Hz before you tune, or leave the tone open while you check a mix on a second speaker.

_Last updated August 28, 2026_