RESON8

Precision instrument

See your sound
stand still.

Reson8 is a studio-grade strobe tuner for guitar, bass, ukulele, piano, brass, woodwinds and drums. It measures to a tenth of a cent — and shows you everything it hears. A metronome and a tone generator come with it, free.

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
±0.003 ¢
Measured error on a 440 Hz reference tone
24 / octave
Spectrum bins — quarter-tone resolution from 55 Hz to 5.4 kHz
6 strings
Measured independently in a single strum
88 keys
Per-key inharmonicity, measured on your piano — not assumed

The measurement

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 continuously and redrawn thirty times a second, with no lag between the string and the screen.

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

Most spectrum displays give the whole bottom octave a handful of coarse steps, so E2 and A2 smear together. Reson8 gives every octave the same 24 steps — a quarter-tone apiece, 160 in all — so adjacent bass notes stay visibly 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

Reson8 learns your room's background level and only listens to what rises meaningfully above it — then holds on to a note as it decays, so a long ring is never cut off mid-note. Hum and air-conditioning don't become "notes".

The same tuner everywhere

Windows, macOS, Linux, iOS, Android and the browser all take the same measurement and give the same numbers. No platform gets a cut-down version, and none of them needs a network connection to work.

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

  • Strike beside each lug and the map fills in round the hoop
  • Evenness is the spread of the lugs, measured — not guesswork

Practice tools

The two things you reach for
right after tuning.

A metronome and a tone generator, in the same list your instrument comes from. Both are free on every platform, the web included.

Metronome

Timed by the audio clock

  • 30–300 BPM, by the ± controls or by tapping — tap tempo averages your last five taps
  • Bars of 1 to 16 beats, subdivided into eighths, triplets or sixteenths
  • Clicks are scheduled ahead onto the audio device's own clock, so a busy interface never nudges the beat
Tone generator

A reference you can hold

  • A0 to C8 — step by semitone, or dial an exact frequency
  • Sine, triangle, square or sawtooth: a richer tone gives your ear more partials to beat against
  • Any frequency reads back as a note name and its cents offset, so an arbitrary number stays legible as music

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 ratesReson8 listens the way you do — following one partial and timing the wobble in it — and reports beats per second, ignoring the rhythm of repeated strikes.
  • 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.
+30¢+15¢ 0¢−15¢−30¢ A0C2C4 C6C8 solved for this piano generic average

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.

01

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.

02

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.

03

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 tuner, running right in your browser — nothing to install, and your audio never leaves the tab. 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. Same free tier as the installed app — the drum tools and the piano evaluation included.

Open Reson8 Web

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

  • The real tuner, not a demoThe same measurement as the installed app, checked to give the same numbers to the same decimal place — strobe, spectrum, drift trace, input metering.
  • Guitar, bass, ukulele, winds, drumsEvery tuning preset, the six-string strum, transposing readout, the lug map — all of it, free.
  • Metronome and tone generatorBoth practice tools too — tap tempo, subdivisions, and a reference tone from A0 to C8, scheduled on the browser's own audio clock.
  • Private by constructionAudio is analysed in your browser and never leaves your device — there is no server to send it to.
  • Piano evaluation, tooMeasure, solve and tune C3 to C5 in the browser. The full compass, the library and the pro panels are the Piano Pro purchase, sold in the iOS, Android and Windows apps.

Every platform

Put a real instrument
in your pocket. And on your desk.

One tuner, one interface — Windows, macOS, Linux, iOS, Android and the web.

Get Reson8 Try it free in your browser