What it is

Chromatic Tuner AUv3 is a high-precision chromatic tuner delivered as an iOS, Mac, and visionOS AUv3 plugin and standalone app. An arc-shaped cents gauge shows pitch drift to the exact cent, an octave display names the note (A4, B3), and calibration spans A=415–466 Hz so you can tune to any reference. Built on Swift and SwiftUI with a real-time pitch detector that runs in the audio render path.

Features

Chromatic tuning

Detects any pitched note — not limited to standard guitar tunings — on an arc-shaped cents gauge.

Cent-accurate readout

Reads pitch drift to the exact cent, so in tune is obvious at a glance.

Octave and frequency display

Shows the detected note with its octave (A4, B3) and its frequency.

A4 calibration

Calibrates the reference from A=415 to A=466 Hz to match historical temperaments, alternate tunings, or another instrument in the room.

Low-latency passthrough

Hear your instrument while tuning without distracting round-trip delay, so it works live, not just in practice.

Plugin or standalone

Runs as an Audio Unit extension in AUM, GarageBand, Cubasis, Loopy Pro, and other hosts, or launches standalone for quick tuning.

Fully accessible

VoiceOver speaks the note and how many cents sharp or flat you are as you play, on iPhone, iPad, Mac, and Apple Vision Pro.

Tune inline, or as a standalone

Most tuners force a context switch: stop your session, open another app, tune, come back. Chromatic Tuner AUv3 runs as an Audio Unit extension so you can drop it on a track in AUM, GarageBand, Cubasis, or Loopy Pro and tune without leaving your host. Need it outside a session? It also launches as a standalone app.

Calibration that matches your session

A440 isn't the only right answer. Whether you're matching a historical instrument tuned to A=432, sitting down with a piano at A=442, or playing along to a record at some other reference, the calibration control (A=415–466 Hz) lets the tuner agree with the rest of the room instead of fighting it.

The detection engine

The pitch detector runs in the audio render path with the host's real-time priority, so it tracks what you actually play — plucked notes, sustains, and bends — without the lag and flutter you get from tuners that poll on a timer. The readout shows the note, its octave, and cents off on an arc gauge, with a low-latency passthrough so you can hear the instrument while you tune.

Accessible tuning

Every control carries a VoiceOver label, and the live readout speaks your note and how many cents sharp or flat you are as you play. That works across iPhone, iPad, Mac, and Apple Vision Pro.

Chromatic Tuner AUv3