# Functional Harmony vs MusicKeyRoll

The clearest difference is update cadence: MusicKeyRoll at weekly against Functional Harmony's every 6 months. MusicKeyRoll also leads on device support (4 vs 2) and iOS requirement (15.6 vs 18.0). 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.

Functional Harmony ships an update every 6 months, MusicKeyRoll weekly. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Functional Harmony | MusicKeyRoll |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (25 ratings)](https://appshunter.io/ios/app/functional-harmony/id1564025162/reviews)** | — |
| Number of ratings | **25** | — |
| Positive reviews | 83.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Weekly** |
| Monetization | Free | — |
| Size | 24 MB | 182 MB |
| Requires iOS | 18.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Dylan Shade](https://appshunter.io/developer/1564023750) | [Mozusystems, LLC](https://appshunter.io/developer/525117694) |

## What reviewers say

### Functional Harmony

[App page](https://appshunter.io/ios/app/functional-harmony/id1564025162)

This music theory app helps users spell chords and scales by entering a root note. It also identifies intervals when two notes are provided. Learn music theory concepts quickly and easily.

**Highlights:** Spell chords, Spell scales, Identify intervals, Enter root note for chords/scales, Enter two notes for interval identification

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### MusicKeyRoll

[App page](https://appshunter.io/ios/app/musickeyroll/id6738299571)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Functional Harmony free?

Functional Harmony is free to download, with no in-app purchases.

### Is MusicKeyRoll free?

MusicKeyRoll is free to download, with no in-app purchases.

### Do Functional Harmony or MusicKeyRoll have ads?

Neither Functional Harmony nor MusicKeyRoll shows ads.

### Which is updated more often, Functional Harmony or MusicKeyRoll?

Functional Harmony ships an update every 6 months, and MusicKeyRoll weekly. Most recently, Functional Harmony was updated on October 24, 2026 and MusicKeyRoll on October 27, 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.*