Precision instrument

See your sound
stand still.

Reson8 is a studio-grade strobe tuner for guitar, bass, ukulele, piano, brass, woodwinds and drums. A native C++ engine measures to a tenth of a cent — and shows you everything it hears.

Get Reson8 Try it free in your browser

Windows · macOS · Linux · iOS · Android · Web

E₂

82.41 Hz

String 6 · Guitar Standard

−14.2 ¢

Tracking

The engine

Most tuners give you a needle.
Reson8 gives you the whole signal.

What the string is doing between frames, where the overtones sit, how far the instrument has drifted while you played it — measured natively, drawn at 30 frames per second, nothing copied in the hot loop.

A strobe that is the measurement

No simulation. Each ring compares the signal's phase at a target partial against a reference — the residual angle is the strobe angle, so the display stands dead still exactly when you are in tune.

A spectrum that resolves the bass

A uniform FFT smears E2 into A2. Reson8 runs a 160-bin constant-Q bank — 24 bins per octave, each with its own window — so adjacent bass notes stay separate and peaks land within 0.1 cents.

Strum all six strings at once

Polyphonic analysis returns an independent frequency, cents offset and clarity for every string in the same frame. One strum, six verdicts — no string-by-string picking.

Intonation drift, over time

A ±25-cent trace shows where your pitch has been, not just where it is — long-tone practice for wind players, stability checks for strings, evidence instead of impressions.

A gate that stays dark in a quiet room

The engine tracks your room's ambient floor adaptively and gates on the margin above it, with hysteresis so a decaying note is never cut off mid-ring. Hum and HVAC don't become "notes".

Native to the metal

Dependency-free C++17 does the listening; results cross to the interface as plain structs — zero copies, zero allocation in the hot loop, identical numbers on every platform.

Workflows

Built for your instrument,
not adapted to it.

Every family gets its own workflow — its own presets, its own display, its own physics.

Guitar

Twenty-one tunings, one strum

Standard, drop, open, modal and 12-string course presets
Full-strum mode: all six strings measured in the same frame
Sub-harmonic disambiguation keeps low E reading E2, not E3

Bass

Four, five and six strings

Standard and drop presets for 4-, 5- and 6-string basses
Long analysis window tuned for slow, low fundamentals
Honest about physics: the docs state exactly where the floor is

Ukulele

Reentrant-aware

High-G standard, low G, baritone, D tuning and slack-key
Strings listed as strung, not sorted by pitch

Piano

A real tuning instrument

Measured per-key inharmonicity and a tuning curve solved from it
Per-partial strobe, unison beat rates, pitch-raise over-pull
Seven historical temperaments, editable interval weights

Brass & woodwinds

Read the note you finger

Transposing readout for B♭, E♭ and F instruments
Drift trace built for long-tone intonation practice

Drums

Tension you can see

Lug-by-lug tension mapping around the hoop
Driven by the f₁₁/f₀₁ modal ratio, not guesswork

For piano technicians

Measured, not assumed.

Inharmonicity varies a hundredfold between a spinet's top octave and a concert grand's tenor — no lookup table can know your piano. Reson8 measures B per key, per instrument, then solves the tuning curve from it by weighted least squares over coincident partials. The stretch comes from your piano's strings, not from a drawn curve.

Per-partial strobeSet a 4:2 octave on partial 4 against partial 2 — each ring locks to its own partial, exactly like a mechanical strobe scaled per band.
Unison beat ratesThe engine listens the way you do — demodulating a partial and timing its envelope — and reports beats per second, with restrike rejection.
Pitch-raise over-pullOvershoot driven by the neighbourhood's average deficiency, capped at 35 cents — the strobe guides you to the overshoot target automatically.
Temperaments & stylesSeven historical temperaments, four stretch styles, and per-interval weight editing — seven sliders, saved with the instrument.
A record per instrumentEvery measurement and setting autosaves to a per-piano record. Open it next visit and the curve is exactly where you left it.

Tuning curve · solved from 11 measured keys

The design

An instrument you'll want to look at.

Reson8 follows a single design language — lab-grade measurement equipment crossed with studio outboard gear. Three rules hold it together.

Materiality

Surfaces are lit, not flat. Panels catch light on their top edge and cast real shadows, so the interface reads as milled parts rather than rectangles.

Phosphor

Glow is reserved for live signal, like an oscilloscope's trace. Static chrome never glows — so your eye is always pulled to the data.

Colour is tuning state

Mint means locked. Amber means close. Red means out. Those three colours are never used for anything else, anywhere in the app — so the most important signal is never ambiguous.

Free, in your browser

Our gift to the
music community.

Reson8 Web is the same engine, compiled to WebAssembly and running entirely on your device — free, no account, no ads, no time limit. Open it before rehearsal, or install it from your browser and keep it on your home screen. If it earns a place on your music stand, the full app adds the professional piano and drum tools.

Open Reson8 Web

Runs in Chrome, Edge, Firefox and Safari — desktop and mobile.

The real engine, not a demoThe identical C++ core, verified to give the same answers through WebAssembly that it gives natively — strobe, constant-Q spectrum, drift trace, metering.
Guitar, bass, ukulele, windsEvery tuning preset, the six-string strum, transposing readout — all of it, free.
Private by constructionAudio is analysed in your browser and never leaves your device — there is no server to send it to.
Piano and drums stay in the full appThe professional tuning suites are in the desktop and mobile versions — that's the whole difference.

See your soundstand still.

Most tuners give you a needle.Reson8 gives you the whole signal.