Show HN: Tone Generator

Aug 02, 2026 02:31 PM - 2 hours ago 1

No instal · Works connected your device

Play immoderate reside from 1 Hz to 20,000 Hz correct successful your browser. Pick a pitch, take a sound shape, and property play. This free hz generator and frequency generator useful connected immoderate device, pinch thing to download.

Balance Center

Left Center Right

Waveform

Turn your measurement down earlier you property play. Some tones are acold louder than they look, and tin wounded your ears aliases your speakers.

Popular frequencies

Play one, aliases stack respective — each pinch its ain measurement and waveform.

What is simply a reside generator?

A reside generator plays 1 cleanable sound astatine the transportation you choose. You type a number successful hertz (Hz) and the instrumentality plays that nonstop tone. It each happens wrong your browser, truthful the sound starts the infinitesimal you property play. Nothing to download, thing to group up.

You tin play a debased 40 Hz reside that you consciousness much than hear, a mediate reside for illustration 440 Hz, aliases a 15,000 Hz reside adjacent the apical of quality hearing. Some group telephone this an hz generator; others telephone it a frequency generator. Same thing.

Why group usage one

Any pitch

Play thing from 1 Hz to 20,000 Hz. Type a number, aliases measurement it 1 hertz astatine a time.

Four sound shapes

Sine is the cleanest tone. Square, sawtooth and triangle sound fuller and sharper.

Left and right

Send the sound to 1 broadside aliases support it centred, truthful you tin trial each speaker connected its own.

Changes correct away

Move a slider and the sound follows while it plays. No stopping and starting.

Easy to share

Copy a nexus that remembers your tone. Anyone who opens it hears the aforesaid thing.

Works connected immoderate device

Phone, tablet aliases machine — the instrumentality behaves the aforesaid connected each of them.

Ways to usage it

Test speakers and headphones. Sweep done a fewer tones to find buzzing, rattles, aliases a broadside that plays quieter than the other.
Check your hearing. Raise the transportation slow and announcement wherever the reside disappears for you.
Tune an instrument. Hold a dependable statement and lucifer your instrumentality to it by ear.
Ease ringing ears. Play a soft reside adjacent to the ringing you hear. Keep the measurement low.
Teach really sound works. Show pitch, waves and wave pinch nary other instrumentality successful the room.
Set up audio gear. Feed a known reside into a mixer aliases amp to group levels earlier a show.

How do you prime the correct frequency?

Start pinch what you're trying to hear. Around 20 to 60 Hz is wherever subwoofers live, truthful that scope shows up rattles successful a car doorway aliases a loose speaker grille. The mediate of the range, astir 200 Hz to 2 kHz, is wherever voices sit, and it's the easiest spot to judge whether 2 speakers are matched. Above 10 kHz you're testing tweeters and your ain ears astatine the aforesaid time.

For tuning, 440 Hz is the modular A that astir orchestras and apps use. Use the sine style for thing you want to lucifer by receptor — the different shapes adhd other tones connected apical and make transportation harder to judge.

What the sound shapes really do

A sine activity is simply a azygous wave and thing else. It sounds smooth, almost hollow, and it's the correct prime for testing and tuning.

Square, sawtooth and triangle waves stack other frequencies connected apical of the 1 you picked. That's why they sound brighter aliases buzzier astatine the aforesaid number of hertz. Square waves are useful for proceeding whether a speaker distorts; sawtooth is person to a synth aliases a drawstring sound; triangle sits successful betwixt and is gentler connected the ears than square.

Common questions

What tones tin I play?

Anything from 1 Hz to 20,000 Hz. Most group perceive astir 20 Hz to 20,000 Hz, and that scope narrows pinch age. Small aliases inexpensive speakers often can't reproduce the very debased aliases very precocious tones moreover though the instrumentality is still sending them.

Is it safe to play large tones?

Turn the measurement down first, past bring it up slowly. This matters astir pinch precocious tones and pinch headphones. Loud tones held for a agelong clip tin harm your proceeding and your speakers. Stop if a sound feels crisp aliases painful.

Which waveform should I use?

Sine, unless you person a logic not to. It's the purest tone, truthful it gives you the clearest publication connected transportation and connected really a speaker behaves. Square, sawtooth and triangle are amended erstwhile you want a fuller, brighter sound.

Can I tune an instrumentality pinch this?

Yes. Pick the transportation you request — 440 Hz for a modular A — group the style to sine, and lucifer your instrumentality by ear. The statement sanction nether the number and the "Pick a note" fastener some thief you onshore connected the correct transportation quickly.

Do I request an net connection?

Only to unfastened the page. After that the sound is made connected your ain device, truthful it keeps playing moreover if your relationship drops.

Can I play much than 1 reside astatine once?

Yes. The celebrated frequencies database lets you stack up to 8 tones together, each pinch its ain measurement and waveform. For afloat power complete each tone, usage the aggregate reside generator.

Why does thing hap erstwhile I property play?

Check that your instrumentality isn't muted and that the measurement slider connected the page isn't astatine zero. Very debased tones beneath astir 30 Hz are besides inaudible connected telephone speakers — they simply can't move capable air.