Lumituner

Professional strobe tuner for web, tablet, and mobile. Your microphone feeds a rotating disc — when the pattern locks still, you're in tune. Built by luthier David Ehlers for players and builders who need precision, not guesswork.

Supports guitar, bass, ukulele, banjo, mandolin, and fiddle with multiple tunings each. Auto mode tracks the nearest string as you play, or lock to a specific string manually.

Create custom tunings with exact Hz targets per string — useful for alternate tunings, scordatura, or period instruments. The strobe measures deviation from your defined frequencies.

Select a temperament — Equal, Just, Pythagorean, Meantone, Werckmeister, or Young II — to shift all string targets accordingly. Apply stretch compensation to correct for string inharmonicity on acoustic guitar, electric guitar, bass, or ukulele.

Use Precision to dial in your A4 reference, tolerance, and response speed. Choose from five tuned pitch detection algorithms — Autocorrelation, YIN, MPM, AMDF, and Cepstrum — optimized for different instruments and playing styles. Tap the play button next to any string to hear its reference tone.

New: Share your instrument setup with clients via read-only links. In Luthier Mode, capture full intonation data, attach photos, and generate shareable snapshots — all synced to the cloud.

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A full setup workstation for luthiers and guitar technicians. Capture open-string and 12th-fret harmonic readings for each string — saddle compensation distances are calculated automatically. Attach photos of the instrument, log session notes, record specs like nut height, action, and relief, and generate a read-only share link for clients. All sessions are saved to the cloud and organized by instrument.

Exposes five pitch detection algorithms tuned for setup work — Autocorrelation for clean signals, YIN for lower octave-error rates, MPM for smooth tracking through bends and vibrato, AMDF for low-CPU situations, and Cepstrum for instruments with strong upper harmonics.

Available on screens 700px wide or larger.

♭ Flat

♯ Sharp

In Tune

The strobe disc rotates based on the difference between your pitch and the target. Counterclockwise (↺) means flat — tune up. Clockwise (↻) means sharp — tune down. When the pattern locks still, you're in tune.

Faster spin = further off The speed of rotation shows how far out you are. A slow drift means you're close; rapid spinning means you're well off pitch.

Auto vs locked string In Auto mode the tuner tracks whichever string you're playing. Tap a string button to lock to it — useful when adjacent strings ring out.

▶ String preview Tap the play icon on any string button to hear its reference tone. Useful for getting your ear in the ballpark before the strobe takes over.

Cents readout The number below the note name shows deviation in cents (¢). 100¢ = 1 semitone. ±2¢ is considered excellent intonation.

Outer rings vs inner rings Each ring represents a different harmonic. If the inner rings lock but outer rings still drift, the fundamental is in tune but upper harmonics are stretched — common on wound strings.

Preview on change

Equal temperament is the 12-tone equal-tempered reference: each semitone is spaced evenly, and no stretch compensation is applied. Use this as the neutral baseline.

Temperament is how the 12 chromatic notes are tuned relative to each other. Equal is the modern standard. Historical systems create key colour — some intervals purer, others more tense.

Stretch compensation corrects for how physical strings vibrate slightly sharp of their theoretical harmonics. These presets raise each string's target by a small amount — more on thicker strings — so the instrument sounds in tune across all registers.

A4 Reference

Sets the concert pitch reference. Standard is 440 Hz. Try 442–444 Hz for orchestral tuning, or 432 Hz for alternative tuning.

In-Tune Zone

How close to perfect before the disc locks. ±5¢ is pro-level precise; ±20¢ is forgiving for quick checks.

Strobe Speed

How fast the strobe rings spin per cent of pitch error. Fast makes small deviations easier to see.

Response Preset

Preset pairs detector sensitivity and pitch smoothing. Use the advanced controls below if you want to tune those separately.

Detector Sensitivity

Controls how much input energy the detector requires before it trusts a pitch. Strict rejects more weak or noisy input; Loose locks on more easily but may admit extra false positives.

Pitch Smoothing

Averages the detected pitch over time before it reaches the display. Fast feels immediate; Smooth steadies the readout and strobe at the cost of extra lag.

Pitch Detector LUTHIER

Background FX

Particles

Glow Effects

Input Display

Guitar: Standard Tuning

Auto String

Professional, Precise Tuning

Microphone access required

Choose your plan

One-time purchase. Yours forever.

Core $4.99 one-time

All instruments & tunings
All pitch algorithms
A4 reference tuning