What frequency range does the tone generator support?
This tone generator accepts exact frequencies from 20 Hz through 20000 Hz, and the note controls stay inside that same audible range.
Play a steady 438 Hz reference tone
Octave: 4
Note: A
Generator
Gain: 0 dB
Need a quick reference pitch?
Use the Tone Generator app or extension for steady pitches during tuning, rehearsal, ear training, and sound checks when you want the note or exact Hz ready right away.
Common questions
How do note and octave mode work here?
The note control picks one chromatic note from C through B, and the octave control chooses the register from 1 through 8. Together they calculate the reference frequency automatically using standard equal-tempered tuning with A4 at 440 Hz.
Can I enter an exact Hz value manually?
Yes. Click the frequency readout, type the number you want, and set it directly. This is useful when you want repeatable sound-check or ear-training targets instead of note names.
Does the tone generator stay on my device?
Yes. The tone is generated locally with your device audio engine, so playback starts there without a server-side audio step.
Why start on an exact number
438 Hz opens in exact-frequency mode, which is the fastest way to keep the reference tied to one fixed value instead of recalculating it from note and octave controls.
Where this frequency is useful
A fixed reference like 438 Hz works well for repeatable checks, tuning comparisons, ear-training drills, and sound-system tests where the number matters as much as the sound.
How to move from here
If you decide a note name is easier to work from, move the note or octave sliders and the preset will switch back into note mode.
Nearby presets
435 Hz Tone Generator
Tone generator preset for 435 Hz in exact-frequency mode with gain control and quick access to nearby fixed references.
435 Hz
440 Hz Tone Generator
Tone generator preset for 440 Hz in exact-frequency mode with gain control and quick access to nearby fixed references.
440 Hz
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