A tuner, and everything beyond. All of tuning, for every player, in one place
A ±1-cent tuner, joined by a pitch coach, just-vs-equal temperament listening, and training tools (long tone, drift meter, range test). Transposing display (B♭/E♭/F/A), A=442, drone. In your browser, right now.
Sound familiar?
Your tuner is lying
Most tuners use simple FFT algorithms. Inaccurate for low notes and overtone-rich instruments.
You can't see progress
Regular tuners don't save data. You never know if you're actually improving week-to-week or month-to-month.
No instrument transposition
Bb clarinet players see wrong notes. Your F horn looks impossible to tune. No transposition kills productivity.
KUON TUNER PRO solves everything.
YIN algorithm delivers ±1 cent accuracy. Transposition, three temperaments (equal / just / Pythagorean) and a sustained drone. The needle is median-filtered, steady, never jumpy.
6 Features
YIN Accuracy
It reads pitch with YIN, a method from academic research. Compared with reading spectral peaks directly, it mistakes the octave less often, and it displays down to one cent.
Transposition
Select your instrument (Bb/Eb/F/A) and notes automatically display in concert pitch. No mental math needed.
Three Temperaments
Equal, just intonation and Pythagorean, with a selectable tonic. Practise pure thirds for string quartets and choirs.
A Steady Needle
Median filtering and smooth tracking keep the needle readable. A real graduated meter shows ±50 cents precisely.
Drone Tone
Sustain any reference note in any octave. Train your ear, not just your eye. Ideal for long-tone practice on winds and strings.
Reference Pitch Control
Adjust from 415 Hz (Baroque) to 466 Hz (bright modern). Match your orchestra's pitch standard instantly.
Just 3 Steps
Select Instrument
Choose your instrument type. Transposition happens automatically.
Allow Microphone
Click "Allow" when the browser asks for microphone access. All processing happens locally, your data never leaves your device.
Play & Tune
See your pitch in real-time. Green zone (±2 cents) means you are in tune.
Who Is This For?
Orchestra Musicians
A=442Hz, perfect intonation required. YIN accuracy ensures compliance.
Wind Musicians
Bb/Eb transposition is daily reality. Automatic display solves confusion.
String Players
Just intonation is essential. Detect pure intervals with ±1 cent precision.
Music Exam Candidates
Track intonation improvement month-to-month. Build confidence before auditions.
vs. Free Tuners
| Feature | Free Tuner Apps | KUON TUNER PRO |
|---|---|---|
| Accuracy | ±3 cents (FFT) | ✓ ±1 cent (YIN) |
| Transposition | None (concert pitch only) | ✓ Bb/Eb/F/A supported |
| Temperaments | Equal only | ✓ Equal / Just / Pythagorean (with tonic) |
| Drone Tone | None | ✓ Any note, any octave |
| Cost | ¥0 (with ads) | ✓ ¥0 (ad-free) |
Real Stories
Clarinet Student
"Finally understands why Bb clarinet sees different notes. Transposition solves 3 years of confusion."
Violin Student
"Uses just intonation mode in string quartet rehearsals. Pure thirds can be checked by both eye and ear."
Flute Student
"Plays long tones against the drone. Tunes by ear first, then checks with the needle, the right order."
Technology
Frequently asked questions
Is it free? Do I need an account?
It is free. No sign-up, no login. It works the moment you open it in a browser, and there are no ads.
Does it handle transposing instruments such as the B flat clarinet or E flat saxophone?
Yes. You can choose B flat (clarinet, soprano and tenor saxophone, trumpet), E flat (alto and baritone saxophone, E flat clarinet), F (horn, cor anglais) and the A clarinet. The note you read in the part is the note it shows.
Can I tune to 442 Hz?
Yes. The reference pitch moves from 415 to 466 Hz in steps of one hertz, so 442 and 443 Hz for wind bands and orchestras, and 415 Hz for early music, are all there.
Is the sound from my microphone sent anywhere?
No. All the processing happens inside your browser. The sound never leaves your device.
Can I tune in just intonation?
Yes. You can switch between equal temperament, just intonation and Pythagorean tuning. For the last two you also choose the tonic they are built on.
Does it help when two or more players tune together?
Yes. The ensemble screen counts the beats you hear when two or more players hold the same note. When the beating stops, you are in tune.
Accelerate your progress. Start tuning with precision. Free, right now.
No signup needed. Works in your browser.
If your instrument is a piano, tuning needs specialised measurement. The dedicated piano tuner lives here.
KUON PIANO →Tuning, instrument by instrument
Each page opens the tuner with the transposition and reference pitch already set, and tells you which written note that instrument plays when the group tunes.
- Flute
- Oboe
- Bassoon
- B flat Clarinet
- A Clarinet
- B flat Trumpet
- Alto Saxophone
- Tenor Saxophone
- Baritone Saxophone
- Soprano Saxophone
- French Horn
- Trombone
- Euphonium
- Tuba