COMING SOON · iOS · ANDROID · AU/VST3

A tuner.
A pretty good one.

A fast, accurate instrument tuner for iPhone, iPad, Android, and your DAW. Free on every platform. No ads, no accounts, no tracking. Try it right here, in your browser.

iPHONE & iPAD Coming soon ANDROID Coming soon AU AND VST3 · MAC & WINDOWS Coming soon

Sointi tuner in chromatic mode showing the note A just 3 cents sharp

WORKS OFFLINE PRECISE PITCH DETECTION STARTS INSTANTLY FREE, FOREVER

It does the job.

Chromatic and instrument modes

Tune any note freely, or use dedicated modes for guitar, bass, ukulele, violin, and custom tunings.

Built for precision

The same Rust pitch engine runs on mobile and desktop, giving you fast detection, stable readings, and consistent results everywhere.

Starts instantly

Open the app and tune. No splash screen, sign-in, setup, or waiting.

How it stays accurate: a small neural network (about 96 k parameters, small enough for any phone) reads a spectrogram of the signal and estimates the pitch. A probabilistic YIN tracker runs alongside it and vetoes the octave mistakes neural models sometimes make; together they catch each other's errors.

One tuner. Pocket to studio.

The same engine and the same numbers, whether it's in your hand or on a track in your DAW. Free everywhere.

Sointi on a phone: the custom tuning builder, setting each string of a drop-D tuning by hand

In your pocket.

The complete tuner on iPhone, iPad, and Android. Chromatic and instrument modes, plus custom tunings you build yourself. Free, with no accounts and no ads.

In your studio.

AU and VST3 for macOS (Apple Silicon and Intel), VST3 for Windows. Add Sointi to a track and tune without leaving your session. Same engine, same numbers as the phone app.

macOS — AU + VST3 Coming soon Windows — VST3 Coming soon

Sointi plugin window in a DAW showing an A in tune

Short answers.

When can I get it?: Very soon — Sointi is in final polish. There is no exact date to promise, but this page gets real download links the day it is out.
Is Sointi really free?: Yes. The whole app, on every platform. No trial, no subscription, no hidden upgrade.
Does it work offline?: Completely. Pitch detection runs on your device, so the app never needs a network.
Which plugin formats are supported?: AU and VST3 on macOS (Apple Silicon and Intel), VST3 on Windows. No AAX yet.
Which instruments have modes?: Guitar, bass, ukulele, and violin. Chromatic mode covers everything else.
Can I build custom tunings?: Yes. Set each string yourself and save the result: drop tunings, open tunings, whatever you play.
Does it collect any data?: No. No analytics, no ads, no accounts.

Free. Forever.

The complete tuner, on every platform. No ads, subscriptions, accounts, tracking, or locked features.