Online Tuner
Real-time chromatic pitch detection via microphone.
Perfect for guitar, bass, ukulele, and wind instruments.
🔒Microphone audio is never sent to any server. All processing is local.
About
A chromatic tuner that analyzes real-time audio from your microphone using the Web Audio API and displays the detected note name, octave, and cent deviation. Works with guitar, bass, ukulele, wind instruments, and any pitched instrument. Pitch detection uses the YIN algorithm. All processing is local — audio never leaves your browser.
How to Use
Allow Microphone
Click "Start Tuning" and grant microphone access when prompted.
Play a Note
Sound a note on your instrument. The note name and frequency appear automatically.
Tune to Center
Adjust your tuning peg until the cent meter needle lands at 0.
Glossary
- Chromatic Tuner
- A tuner that detects all 12 semitones in real time, not limited to a specific instrument.
- Cent
- A unit of pitch measurement. One semitone = 100 cents. ±5 cents is considered well in tune.
- A4 = 440 Hz
- The most common international reference pitch. The A above middle C has a frequency of 440 Hz.
- Equal Temperament
- The modern standard tuning system dividing an octave into 12 equal semitones.
- YIN Algorithm
- A pitch detection algorithm based on autocorrelation, known for stable performance across a wide frequency range.
- Web Audio API
- An HTML5 API for real-time audio processing in the browser. Enables microphone input and analysis.
FAQ
- Q.Which instruments are supported?
- Any pitched instrument — guitar, bass, ukulele, violin, wind instruments, piano, etc.
- Q.Is my audio sent to a server?
- No. All processing is performed locally in your browser via Web Audio API.
- Q.How accurate is it?
- Approximately ±2 cents using the YIN algorithm with fftSize=4096. Best results in a quiet environment.
- Q.Can I change the A4 reference?
- Yes. Use the slider to set A4 between 432 and 446 Hz in 1 Hz steps.
- Q.Does it work on mobile?
- Yes, but iOS Safari requires a user gesture (button tap) to start AudioContext. Auto-start is not possible.
Use Cases
Guitar Tuning
Tune your guitar quickly before practice or performance.
Wind Instrument Intonation
Check intonation for band rehearsals with adjustable A4 reference.
Violin Pitch Checking
Monitor intonation while bowing.
Music Education
Visually learn which notes correspond to which pitches.
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