Online tone generator
Tone Generator, right in your browser. Play a tone here, and get the app for everything else.
Turn the volume down to about 20–30% before you press Play. Pure tones sound quieter than they are.
Mix, binaural beats, noise, sweeps, a metronome, keys and effects are in the app. Every feature is free.
About the app
Tone Generator puts every signal you need on your phone. Pure tones from 1 Hz to 22 kHz, a hearing check, six colours of noise, sweeps, binaural beats, a mix of up to ten tones, a metronome and a keyboard you can play. It is made for musicians, sound engineers, students, and anyone who wants a steady sound for testing, tuning, focus or sleep. The tone above is its Tone screen, and the rest is one tab away in the app.
Features
- Tones from 1 Hz to 22 kHz - slide, tap − and + for exact steps, or type the number
- Four wave shapes - sine, square, triangle and sawtooth
- Pick a note by name in any octave, with A4 tuned from 432 to 444 Hz
- Vibrato, tremolo, ring modulation, pulse width and an on-off pulse for isochronic tones
- Mix up to ten tones at once for chords, beats and test signals
- A hearing check done the way an audiologist does it - eight pitches from 250 Hz to 16 kHz, one ear at a time, with the result as an audiogram of both ears that you can save as a PDF
- Binaural beats with a different tone in each ear, from delta to gamma in one tap
- White, pink, brown, blue, violet and grey noise that never loops, with a slow drift between the ears and a breathing swell. Lay it under a tone, a mix or binaural beats, as loud as you like
- Sweeps, linear or logarithmic, once or in a loop, with up to five legs chained together
- A playable keyboard with chords and arpeggio, and DTMF telephone tones
- A metronome from 20 to 400 BPM - tap tempo, meters from 1/4 to 12/8, subdivisions, accented or silent beats, four click sounds, a tempo trainer, and a buzz or a flash on every beat, with or without the click
- A quick settings tile and icon shortcuts start a tone, noise or the metronome in one tap. Stop from the lock screen or with the headset button
- Keeps playing with the screen off or in another app. Or stops when you leave, your choice
- Built-in bass test, hearing range sweep and speaker cleaner, plus your own named presets you can move to another phone, and the frequencies you played lately
- Sequences: setups that play one after another, each for its own time, once or in a loop
- Share a tone as a link - it opens in the app, or right here in the browser
- Export any signal to a WAV file up to five minutes long, at a set peak level in dBFS for test files
- Left/right balance for testing one speaker at a time, and the right channel's polarity flipped to check that two speakers are wired the same way
- Auto-stop from 5 minutes to 8 hours, with a gentle fade at the end
- The phone's own volume on screen, so you see the level before you press Play
- Six colours to dress the app in, each with a light and a dark side. The app icon follows your choice
- A tablet layout, 15 languages, and a guide to every control with step-by-step uses
- A one-time purchase removes the ads for good, or a short video turns them off for a day. Every feature is free either way
Audio engineering
- Band-limited synthesis using PolyBLEP and PolyBLAMP - no harsh aliasing artefacts, even at the top of the range
- Playback at your device's native sample rate, so nothing is resampled on the way out
- Waveforms matched for equal loudness - changing shape changes timbre, not level
- Smooth gain envelopes everywhere: start, stop, channel changes and the seam of a looping sweep
- Continuous-phase frequency changes - slide smoothly without zipper noise
- Pauses for calls and stops when headphones are unplugged, so a pure tone never lands in your ears at full volume
Hearing safety
A pure continuous tone puts all its energy on one frequency, and it feels quieter than it is. Start low, keep sessions to 15–20 minutes, and take extra care around 2 to 5 kHz, where the ear is most sensitive.
Questions & answers
Is this tone generator free?expand_more
Yes. It runs in your browser with nothing to install and no sign-up. Press Play, then move the slider, tap − and + or type the frequency you need.
How do I test my left and right speakers?expand_more
Tap Left or Right in the row above the Play button. The tone comes out of that side only, so you can tell at once whether the channels are swapped or one speaker is quiet.
Why can't I hear the highest or lowest frequencies?expand_more
Two reasons. Laptop and phone speakers rarely reproduce much below 100 Hz, so a low tone may be almost silent on them while headphones play it clearly. At the top, most adults stop hearing somewhere between 14 and 17 kHz, and the limit drops with age. If a high tone is silent on headphones and on speakers, it is usually your ears, not the hardware.
Why is there no sound on my iPhone?expand_more
Turn the volume up a little first. Older versions of iOS also mute browser sound while the phone is set to silent, so flip the ring switch or turn Silent Mode off in Control Center and press Play again.
Does it keep playing with the screen off?expand_more
On a computer, yes, as long as the tab stays open. Phones pause browser sound when the screen locks or another app comes up. The Tone Generator app keeps playing in the background, with a timer to stop it.
What does the app add?expand_more
Mix, binaural beats, six colours of noise, sweeps, a metronome, a playable keyboard, telephone tones, effects, your own presets, export to WAV, playback in the background and six colours to dress it in. The tabs above the readout show each of them.