Tuner · Chromatic · Guitar · Violin · Recorder
Online tuner, free and with your microphone
Play a note and see whether it is in tune: the tuner shows the note and how far off it is in cents. Chromatic, or set to your instrument’s tuning. No sign-up, nothing to install.
Press the button and allow microphone access. Your audio never leaves your browser.
With a specific instrument, play a note and the tuner picks the closest one. Tap a note in the list to hear it and lock it as your target; tap it again to release it. It works best in a quiet room with one note at a time. For guitar there is a page with a headstock diagram: guitar tuner.
This is the basic tuner. In MIDI & MusicXML Player the score plays with tempo, key and instrument changes, and there are more than 5,000 scores and exercises. If you are starting on the recorder, Mi Flauta Dulce will listen through the microphone while you play; it is coming soon to Google Play and the App Store, with no date yet.
See the PlayerIn three steps
Turn on the microphone
Your browser will ask for permission. The audio is analyzed on your own device and is not sent anywhere.
Choose an instrument
Chromatic for any note, or the tuning for guitar, bass, ukulele, violin or recorder.
Play a note
The needle shows whether you are flat or sharp. Green means within 5 cents of the note.
How to tune with your microphone
A tuner measures the frequency of a sound, compares it with the nearest note and shows how far off it is in cents: one cent is a hundredth of a semitone. At 0 cents the note is exactly on pitch; the sign tells you whether it is sharp (+) or flat (−).
Tips for an accurate reading
- Find a quiet spot: background noise and other instruments confuse the reading.
- One note at a time: let it ring for a few seconds; the value settles after a moment.
- Bring the microphone closer without overloading it, and do not play too hard.
- Tune more than once: when you tighten one string, the others can drift a little.
Notes for each instrument
These are the notes in each instrument’s list, as they sound. For recorders, the sounding pitch is shown, not the written note.
| Instrument | Notes |
|---|---|
| Guitar | E2 · A2 · D3 · G3 · B3 · E4 |
| 4-string bass | E1 · A1 · D2 · G2 |
| Ukulele (GCEA) | G4 · C4 · E4 · A4 |
| Violin | G3 · D4 · A4 · E5 |
| Soprano recorder | C5 to C6 |
| Alto recorder | F4 to F5 |
The reference: A4 = 440 Hz
Most instruments are tuned with A4 at 440 Hz. Some early-music groups use other references, such as 415 Hz; the tuner lets you change it from 415 to 466 Hz.
Common questions
Is it free?
Yes. The tuner is free and does not ask for sign-up or an email address.
Is my audio recorded or sent anywhere?
No. The microphone audio is analyzed in your browser and is neither sent nor saved.
Why does it ask for microphone permission?
To hear the note you play and measure its frequency. It cannot tune without a microphone. If you blocked it, you can allow it again from the lock icon next to the page address.
How accurate is it?
It shows the deviation in cents. The reading depends on your device’s microphone, the noise in the room and playing a single note; for very fine adjustment, repeat the reading and compare it with a clip-on or pedal tuner.
Does it work with the recorder?
Yes: choose soprano or alto recorder to see its notes. A recorder’s pitch changes a little with temperature and breath pressure, and it usually rises as it warms up, so warm it up for a moment before tuning.
Why doesn’t it pick up low notes well?
Very low notes, such as a bass guitar’s, need a microphone that picks them up well. Try moving it closer to the instrument or playing a little louder.
What does “chromatic” mean?
It recognizes any note of the twelve-semitone scale, instead of being limited to the strings of one instrument.
Does it work on a phone?
Yes, in current phone and desktop browsers. The page must be opened over a secure connection (https), as it is here.
Keep making music
In MIDI & MusicXML Player you can follow the score while it plays, with tempo, key and instrument changes. And if you are starting on the recorder, Mi Flauta Dulce will guide you through six stages and listen through the microphone; it is coming soon to Google Play and the App Store, with no date yet, and its web version is currently in Spanish only.