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.
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.
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.
Every object has a note
Press Start listening, then tap a glass, mug or table near your mic to hear its hidden musical pitch.
your glass
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.
Lower = only loud, clean knocks. Higher = catches gentle taps (but more false triggers).
100% private — audio is analysed on your device and never uploaded.
Why you’ll love Knock to Tune
Instant & free
No signup, no paywall, no limits — Knock to Tune works the moment the page loads.
Completely private
Everything runs in your browser. Nothing you enter is ever uploaded or stored on a server.
Works on any device
Fully responsive and touch-friendly — use it on your phone, tablet or desktop.
Instant sound
Plays in real time in your browser via the Web Audio API — headphones recommended.
How to use it
Open it
No download and no login — the tool is ready right at the top of this page.
Use it
Enter your details or start interacting. Everything updates live as you go.
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
Frequently asked questions
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.
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.
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.
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.
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.
Browsers require a single tap before playing audio. After that first tap, everything works instantly.
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