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Knock to Tune

Tap a glass, mug or pipe and it names the note it rang at — plus a mode that tells you how much water to pour to tune a glass to any pitch.

  • 🎧 Audio Tool
  • ✓ Free
  • ✓ No sign-up
  • ✓ Private — runs in your browser
  • ✓ Any device
🎤

Mic listening isn't available here

Your browser doesn't support live microphone input (or the page isn't on HTTPS). Open this on a phone or a modern desktop browser over HTTPS to tap-and-tune any object.

mic

detected peak · % confidence

👋 Tap something!

Flick a glass, mug, table or pipe near the mic — I'll catch its ring.

Microphone blocked 🔒

Allow mic access for this site (tap the 🔒 / camera icon in your address bar), then press Start listening again.

Resonance fundamental highlighted
Overtone series (harmonics of the fundamental)
Recent taps
🔔

Every object has a note

Press Start listening, then tap a glass, mug or table near your mic to hear its hidden musical pitch.

Target note

your glass

Last tap:
flat ♭on targetsharp ♯
🍷

Sing a glass into tune

Pick a target note, press Start listening, then tap your glass. Add or remove water as I guide you, and re-tap until it locks in.

Concert pitch (A4)
Tap sensitivity

Lower = only loud, clean knocks. Higher = catches gentle taps (but more false triggers).

Note labels
Play the note back on capture

100% private — audio is analysed on your device and never uploaded.

Why you’ll love Knock to Tune

Instant & freeNo signup, no paywall, no limits — Knock to Tune works the moment the page loads.
Completely privateEverything runs in your browser. Nothing you enter is ever uploaded or stored on a server.
Works on any deviceFully responsive and touch-friendly — use it on your phone, tablet or desktop.
Instant soundPlays in real time in your browser via the Web Audio API — headphones recommended.

How to use it

  1. 01

    Open it

    No download and no login — the tool is ready right at the top of this page.

  2. 02

    Use it

    Enter your details or start interacting. Everything updates live as you go.

  3. 03

    Get your result

    Copy, download or share your result in a single tap. That’s it.

About Knock to Tune

Knock to Tune is a free browser-based tap note finder that instantly identifies the pitch of any object. Simply tap a glass, mug, pipe, or other resonant surface, and the tool names the exact musical note it produces by analyzing its resonant frequency. No signup needed, and all analysis happens in your browser—your audio data never leaves your device.

The tool includes a dedicated mode for tuning musical glasses with water. Tell it which note you want, and it calculates precisely how much water to pour into any glass to achieve that exact pitch. This takes the guesswork out of creating DIY glass instruments or setting up water-filled resonators for acoustic experiments.

Whether you're exploring music theory, building a set of musical glasses, diagnosing acoustic properties of objects, or simply curious what notes household items produce, Knock to Tune gives you instant feedback without ads, paywalls, or any setup required.

Popular uses

  • ✦ Tuning a set of musical glasses for performances or party tricks without trial and error.
  • ✦ Identifying the pitch of ringing objects you find to understand their acoustic properties.
  • ✦ Creating a DIY water-bottle musical instrument by calculating exact fill levels for specific scales.
  • ✦ Teaching music theory by letting students discover the pitches hidden in everyday objects.
  • ✦ Testing material resonance in workshops or studios to understand how different vessels vibrate.

Frequently asked questions

How accurate is the note detection when I tap an object?
The pitch detection is accurate to within a semitone for most household objects. Clarity depends on how cleanly the object resonates—a well-tapped wine glass will give clearer results than a dull thud on plastic. The tool shows you both the detected note and how confident it is in that detection.
Can I really tune a glass to play a specific note?
Yes. The water-tuning mode calculates the water volume needed based on the glass shape and target pitch. The relationship between water level and resonant frequency is predictable, so it tells you exactly how full to fill the glass. Actual results depend on glass shape consistency and how precisely you measure.
Do I need to create an account or install anything?
No. Knock to Tune runs entirely in your web browser with no signup, login, or software installation. Open it and start tapping—your browser handles all the analysis.
Is my audio data stored or shared?
No. The tool processes audio locally in your browser only. Nothing is recorded, uploaded, or stored anywhere. The moment you close the tab, no trace remains.
Is Knock to Tune free to use?
Knock to Tune is 100% free — no signup, no watermarks and no usage limits. It’s one of 200+ free tools we build and give away.
Why do I tap once before sound plays?
Browsers require a single tap before playing audio. After that first tap, everything works instantly.

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