# Circle of Fifths vs Note a problem

The clearest difference is update cadence: Note a problem at every 3 weeks against Circle of Fifths's every 16 months. Circle of Fifths's advantage is device support (3 vs 1) and iOS requirement (13.0 vs 17.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Circle of Fifths ships an update every 16 months, Note a problem every 3 weeks. The most recent releases landed on October 23, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Circle of Fifths | Note a problem |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (233 ratings)](https://appshunter.io/ios/app/circle-of-fifths/id1558441265/reviews)** | — |
| Number of ratings | **233** | — |
| Positive reviews | 97.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 16 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 23 MB | 16 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Josh Liebe (Pty) Ltd](https://appshunter.io/developer/1558441417) | [Timas Ljungdahl](https://appshunter.io/developer/1788898384) |

## What reviewers say

### Circle of Fifths

[App page](https://appshunter.io/ios/app/circle-of-fifths/id1558441265)

Explore music theory with a visual representation of the 12 keys. Understand scales, compose chord progressions, and mix in key. Features color-coded relationships, key signatures, and sounded chords for each key.

**Highlights:** Color-coded key relationships, Key signature and triad display, Sounded chords and arpeggios, Lockable circle to selected key, Tappable legend for key degrees, Multiple color schemes, Modern UI

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to use
- 🚀 Simple and effective
- 🎨 Great visual representation
- 🔊 Helpful audio feedback
- 💰 Free and no ads

**What reviewers complain about**

- 🔧 Lacks some advanced features
- 🔀 Difficulty toggling between chord and arpeggio modes
- 🔇 Limited sound options

**Reported bugs**

- Incorrect chord notation for some keys
- Slow launch time on certain devices

**Requested features**

- Ability to change chord voicings
- Support for other musical modes (Dorian, Mixolydian, etc.)
- Option to display scale degrees/Roman numerals
- Accessibility improvements for visually impaired users


### Note a problem

[App page](https://appshunter.io/ios/app/note-a-problem/id6740204919)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Circle of Fifths free?

Circle of Fifths is free to download, with no in-app purchases.

### Is Note a problem free?

Note a problem is free to download, with no in-app purchases.

### Do Circle of Fifths or Note a problem have ads?

Neither Circle of Fifths nor Note a problem shows ads.

### Which is updated more often, Circle of Fifths or Note a problem?

Circle of Fifths ships an update every 16 months, and Note a problem every 3 weeks. Most recently, Circle of Fifths was updated on October 23, 2026 and Note a problem on October 25, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*