A simple tone generator: enter a frequency and play a pure sine wave. Use it to tune an instrument (440 Hz is standard 'A'), test the range of speakers or headphones, or check your hearing. Want the current time alongside? Use the frequency clock.
Guides about Tone Generator
Frequency & hertz explained
50 Hz vs 60 Hz: Mains Hum and the Frequency of the Grid
An explanation of the grid frequency behind electrical hum and synchronous electric clocks, with a tone-generator comparison.
Tone generator uses
Binaural Beats Explained: What Two Tones Actually Do
A binaural beat is a perception created when each ear hears a slightly different tone; this article explains the physics, the evidence, and a safe way to try it yourself.
Testing speakers & hearing
Subwoofer Test Tones: Checking Bass From 20 to 200 Hz
A practical guide to using subwoofer test tones for checking bass response, crossover settings, and room modes from 20 to 200 Hz.
432 Hz vs 440 Hz
432 Hz vs 440 Hz: What the Tuning Debate Really Means
A balanced look at the 432 Hz versus 440 Hz tuning debate, explaining what concert pitch is, where the argument comes from, and why superiority claims remain unproven.
432 Hz vs 440 Hz
The History of A440: How We Agreed on Concert Pitch
The story of how musicians came to agree on 440 Hz as concert pitch, why tuning varied wildly for centuries, and the myths that have grown around the standard.
Tone generator uses
How to Tune an Instrument With a Reference Tone
A step-by-step guide to tuning any instrument by ear with a pure reference tone, from choosing the right frequency to matching pitch and avoiding common mistakes.
More frequencyclock pages
Frequently asked questions
What can I use it for?
Tuning instruments, testing speaker/headphone frequency response, informal hearing checks, and sound experiments.
Is it a pure tone?
Yes — it produces a single sine-wave frequency with no overtones.