# PureTune Keys

> Just Intonation Keyboard

Canonical page: [https://chrome-stats.com/d/id6800927665](https://chrome-stats.com/d/id6800927665)

## Overview

- **ID:** `id6800927665`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Hiroto Okawa
- **Category:** Music
- **Version:** 1.0
- **Last updated:** 2026-08-29
- **First published:** 2026-08-29
- **Size:** 10 MB
- **Data as of:** 2026-09-04
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/puretune-keys/id6800927665)
- **Privacy policy:** [https://pure-tune-keys.vercel.app/privacy](https://pure-tune-keys.vercel.app/privacy)

## Description

Compare equal temperament and just intonation as you play. Root C is free; unlock all 12 keys permanently with Pro.

PureTune Keys is a keyboard for playing and comparing equal temperament and just intonation. Hear the difference in intervals and chords directly on the on-screen keyboard. A supported wired USB MIDI keyboard can also be used.

FEATURES
• Switch between equal temperament and just intonation
• Choose major or minor
• Select a root key
• Adjust the waveform, master pitch, and volume
• Sustain notes after releasing the keys
• Shift the keyboard octave
• See active notes and tuning offsets
• Stop every note instantly with the Off button

The free version includes Root C. A one-time Pro purchase permanently unlocks the other 11 root keys. This is not a subscription.

MIDI hardware is optional. Every feature can be reviewed with the on-screen keyboard.

## Rankings

- #2,145,362 — Overall

## Similar extensions and apps

- [MultiTuneKeys](https://chrome-stats.com/d/id6764493629)
- [Harmony Keyboard](https://chrome-stats.com/d/id6745786039)
- [KeyTuner](https://chrome-stats.com/d/id1328712601) — 4.70 / 5
- [OnlyPure Piano Tuner](https://chrome-stats.com/d/id1635946378) — 4.50 / 5
- [NiceTuner](https://chrome-stats.com/d/id6757993419)
- [UniTuner Pro - Chromatic Tuner](https://chrome-stats.com/d/id6741528331) — 5.00 / 5
- [PiaTune](https://chrome-stats.com/d/id1441771210) — 4.40 / 5
- [Tune Time - musician toolkit](https://chrome-stats.com/d/id6760885904) — 5.00 / 5
- [Harmodus Piano - Pure Tuning](https://chrome-stats.com/d/id6786988622)
- [Saxjax Tuner Lite](https://chrome-stats.com/d/id1308528794) — 3.00 / 5
- [Tuner Universal](https://chrome-stats.com/d/id6759379649)
- [TuneClear - Instrument Tuner](https://chrome-stats.com/d/id6764253462)

---

Source: [Chrome-Stats](https://chrome-stats.com/d/id6800927665)