SuperTuner – Free Online Tuner

SuperTuner is a free, browser-based chromatic tuner that uses your device’s microphone to detect pitch in real time. It helps musicians tune guitars, basses, violins, and other stringed instruments accurately—no downloads or logins required.

SuperTuner works with most string and fretted instruments including guitar, bass, ukulele, violin, viola, cello, mandolin, banjo, sitar, pedal steel, lap steel, tres, and cuatro. You can also use it to tune brass, woodwinds, and even voice practice.

SuperTuner supports standard EADGBE tuning by default, plus popular alternates like Drop D, Open G, Open D, DADGAD, and half-step down. Chromatic mode allows any custom or experimental tuning.

When you play a note, SuperTuner listens through your microphone, analyzes the pitch frequency, and displays how sharp or flat it is compared to the target note. The LED meter and frequency readout update instantly for precise feedback.

Yes — SuperTuner is completely free to use. It runs locally in your browser and doesn’t collect personal data or require registration. You can use it anytime on desktop or mobile.

Yes. SuperTuner works equally well for acoustic and electric instruments. Just make sure your device’s microphone can clearly hear the note being played.

Yes. SuperTuner runs smoothly on iOS and Android browsers like Safari and Chrome. It’s fully responsive and works great with built-in phone microphones.

The reference tone generator is a built-in sound source that plays a steady note at a chosen pitch (like A4 = 440 Hz). It lets you tune by ear instead of relying solely on visual feedback. It’s especially useful for ear training and ensemble work where all players tune to the same tone.

When you select a note and waveform, SuperTuner’s tone engine synthesizes a continuous digital tone at that exact frequency using your browser’s Web Audio API. It plays through your device’s speakers or headphones, producing a pure, stable reference pitch.

Choose the note you want to match—commonly A4, but you can pick any. Adjust the volume and waveform (sine, triangle, or square) to your liking. Then play your instrument and slowly adjust its tuning until the two pitches blend smoothly and no “beating” is heard.

Yes. When you change instrument presets, the reference tone automatically updates to match that instrument’s typical tuning range. For example, switching from guitar to violin adjusts the tone bank to violin-friendly reference notes.

Yes. SuperTuner includes 432 Hz (sometimes called “Verdi tuning”) as a selectable reference pitch. You can switch between 440 Hz, 432 Hz, and other options in the A4 menu to fit your musical style or personal preference.

440 Hz is the current global concert standard (A4 = 440 Hz). 432 Hz is slightly lower in pitch—about 32 cents flat—and some musicians find it produces a warmer, more relaxed sound. Both are perfectly valid; the difference is a matter of taste and context.

In addition to 440 Hz and 432 Hz, SuperTuner offers 415 Hz (Baroque), 442 Hz (European orchestral), 455 Hz (Beethoven fork), 460 Hz (choir), and others. These presets make it easy to match historical temperaments or regional standards.

Using your ear to align with a live tone develops musical intuition. Instead of chasing a meter, you listen for resonance and beat frequencies—the same way orchestras and vocal ensembles tune together. This approach builds stronger pitch awareness and a more musical sense of intonation.

SuperTuner uses your device’s microphone input via the Web Audio API. The incoming sound is analyzed through a high-resolution Fast Fourier Transform (FFT) to detect the fundamental frequency in real time. The system then calculates the nearest note, deviation in cents, and updates the LED and frequency displays instantly for precise visual feedback.

Yes, in chromatic mode you can tune any instrument that produces a steady pitch — including trumpet, flute, clarinet, saxophone, or voice. The tuner will detect and display the nearest note and frequency.