# EDO Tuner

> Instrument tuner for equal temperaments from 1 to 41 notes. (iPhone/iPad app by John Watson.)

- Source: https://appshunter.io/ios/app/edo-tuner/id1540791638 (this page in markdown: same URL + `.md`)
- Developer: [John Watson](https://appshunter.io/developer/1540791640)
- Category: Music
- Price: Free
- Rating: 5.00/5 from 7 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 14.0 · 4 MB
- Languages: English
- Released: 2020-11-18
- Data updated: 2026-07-04
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/edo-tuner/id1540791638/reviews.md

## What is EDO Tuner?

EDO Tuner makes it easy to tune your instruments to ETs / TETs / EDOs outside of 12 from your device.

Features:
– Choose any equal temperament from 1 to 41
– Variable root frequency from C4 to C5 - 1
– Super smooth tuning experience. Tuner bar uses special algorithms to avoid jumping between harmonics and background noise while tuning your instrument
– Track your current frequency and error in cents

How to Use:
1) Set the "Number of Notes" to split each octave equally into that however many notes you like
2) Set the "Root Frequency" to change the frequency that all octaves are based on
3) Go ahead and play a note on your instrument! EDO Tuner will find the nearest note

Note:
In the tuner bar, the big number is the note number, the small number is the octave. For example, in 12 TET:
0 = C
1 = C#
2 = D
3 = D#
etc...

## Key features

- Supports 1-41 equal temperaments
- Variable root frequency
- Smooth tuning bar
- Tracks frequency and error in cents
- User-friendly interface

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/edo-tuner/id1540791638/reviews.md

### 5/5 — Best tuner app I’ve ever used

*2020-12-18, version 1.0*

It really gives me a smooth tuning experience. Works pretty well with my cello. And no annoying ads inside the app. A solid 5.

## Frequently asked questions about EDO Tuner

### What is EDO Tuner used for?

EDO Tuner is used to tune instruments to equal temperaments (ETs/TETs/EDOs) that go beyond the standard 12 notes per octave. It helps musicians explore and accurately tune to these alternative tuning systems.

### How many notes can EDO Tuner split an octave into?

EDO Tuner allows users to choose any equal temperament from 1 to 41 notes, offering a wide range of possibilities for tuning.

### What is the root frequency range in EDO Tuner?

The root frequency can be set from C4 to C5 - 1, providing flexibility in establishing the base tuning for your instrument.

### Does EDO Tuner have ads?

The provided data does not specify if EDO Tuner contains advertisements. It is listed as free with no in-app purchases.

### What devices is EDO Tuner available on?

EDO Tuner is available on devices with an age rating of 4+ and was last updated on February 13, 2021, with version 1.2.

### How does EDO Tuner track tuning accuracy?

The app features a tuner bar that uses special algorithms to avoid jumping between harmonics and background noise. It tracks your current frequency and error in cents for precise tuning.

### Is EDO Tuner suitable for beginners?

Yes, EDO Tuner is designed to be easy to use, allowing users to set the number of notes and root frequency before playing their instrument. The tuner bar provides clear feedback on the nearest note and error.

### How often is EDO Tuner updated?

EDO Tuner was last updated on February 13, 2021, with version 1.2. The release date was November 18, 2020.

## Version history (last 1 release)

### 1.2 — 2021-02-13

– Updated frequency display to be smoother

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## More apps by John Watson

- [Simple Music Theory](https://appshunter.io/ios/app/simple-music-theory/id1551744142)

All apps by John Watson: https://appshunter.io/developer/1540791640

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-04.*