# Circle of Fifths, Opus 1 — Music theory learning tool

> Interactive music theory tool for scales, chords, and composition. (iPhone/iPad app by Felt Tip Inc..)

- Source: https://appshunter.io/ios/app/circle-of-fifths-opus-1/id637783279 (this page in markdown: same URL + `.md`)
- Developer: [Felt Tip Inc.](https://appshunter.io/developer/306118159)
- Category: Music, Education
- Price: $2.99
- Rating: 3.50/5 from 4 App Store ratings · 7 written reviews indexed
- Age rating: 4+
- Requires: iOS 11.0 · 16 MB
- Languages: American English
- Released: 2013-04-26
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/circle-of-fifths-opus-1/id637783279/reviews.md

## What is Circle of Fifths, Opus 1?

A music theory tool for beginner musicians, Circle of Fifths, Opus 1 is a pocket reference for analyzing, transposing, and composing music. This app focuses on major and relative minor scales and chord progressions.

For a more advanced version of Circle of Fifths, check out our Circle of Fifths, Opus 2 edition. Opus 2 explores musical modes often used in jazz and a variety of other musical styles.

FEATURES
• Interactive circle: rotate it or tap on a key to see its scale and circle chord progression.
• Play scales and chords out loud by tapping on the staves.
• Tap on individual chords to explore chord patterns.
• Includes both chord name and roman numeral notation.
• Choose from treble, bass, or alto clef.

Circle of Fifths, Opus 1 was created by Lucius Kwok and Agnes Chan. Made in NYC.

## Key features

- Interactive circle of fifths
- Play scales and chords aloud
- Explore chord patterns
- Chord name and roman numeral notation
- Treble, bass, or alto clef options

## Recent user reviews (7 of 7)

All indexed reviews: https://appshunter.io/ios/app/circle-of-fifths-opus-1/id637783279/reviews.md

### 5/5 — Simple and helpful

*2025-03-27*

This is a simple Circle of Fifths app, very bare bones, but it does provide the basics. The app seems to run fine in MacOS Sequoia. I’m not having any issues.

### 1/5 — No instruction how to navigate.

*2020-07-10*

Has nothing important to show.

### 4/5 — I like it, a little pricey

*2019-01-13*

I just wanted an app to study the Circle Of Fifths, and to use as a future reference. This app gives me that, but it gives it in a nicely designed and functioning package. As for cost, I feel it’s a bit much for an app as simple as this.

### 4/5 — Doesn't state inversion

*2017-03-07*

Uses inverted chords but does not notate the inversion, also does not list the notes present in each chord. In view of it lacking those features, this app is useful but definitely overpriced for what it delivers.

### 2/5 — Too expensive for what you get

*2015-01-28*

Nice app for a circle of fifths reference- but sincerely way too expensive for what little you get with the app.  Maybe if there was more included? As of right now - not worth the full $5?

### 3/5 — Should cost less

*2014-04-20*

This app is okay, but it is way over-priced. It is very simplistic. For example: There isn't an explanation of what the circle of fifths is or how beneficial it can be to the music student. It doesn't name the chords, which would be very helpful. It doesn't show any chord inversions. It doesn't have anywhere near as much information as I would expect from a $4.99 app. I have $1.99 apps that have more information.

### 5/5 — Great app for learning scales!

*2014-01-07*

This app has a great layout and is convenient when you forget your scale book. :)

## Frequently asked questions about Circle of Fifths, Opus 1

### What is Circle of Fifths, Opus 1 used for?

Circle of Fifths, Opus 1 is a music theory tool designed for beginner musicians. It helps with analyzing, transposing, and composing music, focusing on major and relative minor scales and chord progressions.

### What are the key features of Circle of Fifths, Opus 1?

Key features include an interactive circle that shows scales and chord progressions, the ability to play scales and chords aloud, exploration of chord patterns, and support for treble, bass, or alto clefs.

### What is the price of Circle of Fifths, Opus 1?

Circle of Fifths, Opus 1 is a paid application priced at $2.99.

### What devices is Circle of Fifths, Opus 1 available on?

Circle of Fifths, Opus 1 is available on iPhone, iPad, and iPod devices.

### What is the age rating for Circle of Fifths, Opus 1?

Circle of Fifths, Opus 1 has an age rating of 4+.

### When was Circle of Fifths, Opus 1 last updated?

The latest version of Circle of Fifths, Opus 1 was released on December 9, 2019.

### Does Circle of Fifths, Opus 1 have ads?

No, Circle of Fifths, Opus 1 does not contain advertisements.

### Is there a more advanced version of Circle of Fifths, Opus 1?

Yes, there is a more advanced version called Circle of Fifths, Opus 2, which explores musical modes often used in jazz and other styles.

## Version history (last 5 releases)

### 2019.12.5 — 2019-12-09

Moved the support FAQ to felttip.com/support/5ths-faq.html.

### 2.4.5 — 2019-09-18

Now supports Dark Mode.

### 2.4.4 — 2018-03-14

Updated the layout to accommodate iPhone X design and to improve design of split view modes on the iPad.

### 2.4.3 — 2017-06-28

• Updated the More Apps button.
• Bug fixes.

### 2.4.2 — 2016-09-18

Added a link to the Musician’s Bundle, which includes our tuner app Tuna Pitch and the advanced Circle of Fifths, Opus 2.

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## More apps by Felt Tip Inc.

- [Tuna Pitch - chromatic tuner](https://appshunter.io/ios/app/tuna-pitch-chromatic-tuner/id313492710)
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- [The Grix by eBoy](https://appshunter.io/ios/app/the-grix-by-eboy/id501431754)
- [RunQuest 21k](https://appshunter.io/ios/app/runquest-21k/id587108779)

All apps by Felt Tip Inc.: https://appshunter.io/developer/306118159

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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 2026-06-10.*