A cents-accurate browser tuner for guitar. Six tuning presets, adjustable A4 reference, fullscreen focus mode for live use. Built on the Web Audio API and the open-source McLeod Pitch Method — your microphone stream stays in the browser.
The tuner needs access to your mic to listen for pitch. Audio is analysed in your browser only — nothing is sent anywhere.
Play a note
Standard · E A D G B E
Tuning
What is a chromatic guitar tuner?
A chromatic guitar tuner listens to your instrument and tells you which note you're playing and how many cents you're off pitch. This is a free browser-based chromatic tuner with cents-accurate detection, six tuning presets (Standard, Drop D, DADGAD, Half-step down, Open G, Open D) and an adjustable A4 reference for orchestral and alternative tunings.
How to use
Six steps from cold strings to in tune. Same flow whether you're tuning up before a lesson or quickly retuning between songs at a gig.
Click "Turn on the mic". Your browser will ask for permission. The audio stream is analysed locally — nothing is sent to a server.
Standard EADGBE is the default. Tap any other preset (Drop D, DADGAD, Half-step down, Open G, Open D) to switch — the string indicators update immediately.
Most playing happens at A4 = 440 Hz. Bump it up or down with the + / − buttons if you're tuning to an instrument at 442 (orchestral) or 432 (alternative tuning).
Pluck one string at a time, clearly. The tuner detects the pitch and shows the closest note. The matching string indicator below lights up sage green.
The needle shows how many cents you're off. Aim for the centre. When you're within ±5 cents, the needle and note name turn sage green to confirm you're in tune.
If you're flat, tune up. If you're sharp, tune below the target then back up — bringing the string up to pitch keeps the peg under load so the tuning holds.
FAQ
What tutors and learners ask us about the tuner, microphone permissions, and tuning accuracy.
localStorage so you don't need to reset it each visit.pitchy library), which is accurate to within ±1 cent under normal conditions — well below the threshold of human hearing for pitch difference. A clarity threshold of 0.92 filters out background noise, and a 6-frame median smooths the reading so the needle doesn't twitch.How it works
The tuner uses the McLeod Pitch Method via the open-source
pitchy library — accurate down to the low E (82 Hz)
on a half-decent built-in mic. Confidence filtering keeps the needle
from twitching when you're not actually playing.
When you're within ±5 cents the needle and note name go sage green. When you're flat or sharp, ember. Aim for the centre and hold steady for a moment — the reading averages itself over the last few frames to keep things calm.
No data leaves your browser. The mic stream is opened, analysed locally, and torn down as soon as you stop. Clicking "Stop mic" or navigating away releases the device.
Pro tip
"Tune up to a note, not down. Bringing the string up to pitch keeps the tuning peg under load and stops it slipping mid-set."
— From the journal
Pair it with
The metronome →
Most students who quit cite 'lack of progress' — and the fix starts with a structured lesson and a measurable practice plan. The tuner is step one.
A practical five-block lesson template (warm-up, technique, repertoire, theory, homework) with timing splits for 30/45/60 minute lessons.
Why an out-of-tune guitar is worse than no practice at all, and how to build the set/log/review loop that makes home practice happen.
Once you are in tune, the metronome is what makes practice measurable. Drift-free, no ads, no signup — works on any device.