# B vs Functional Harmony

The clearest difference is price: Functional Harmony at Free against B's $1.99. Functional Harmony also leads on rating (4.9 vs 3.5) and review sentiment (83% vs 50%). B's advantage is iOS requirement (10.0 vs 18.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

Functional Harmony is free to download; B costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Functional Harmony holds the better App Store score, 4.9 against 3.5. That said, the two scores are not equally well evidenced: Functional Harmony has 25 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 50% of B's written reviews are positive against 83% of Functional Harmony's.

B ships an update every 9 months, Functional Harmony every 6 months. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | B | Functional Harmony |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | [3.5 (2 ratings)](https://appshunter.io/ios/app/b-system-cba-accordion-tutor/id1037609940/reviews) | **[4.9 (25 ratings)](https://appshunter.io/ios/app/functional-harmony/id1564025162/reviews)** |
| Number of ratings | 2 | **25** |
| Positive reviews | 50.0% of reviews | **83.3% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 6 months** |
| Monetization | Paid | **Free** |
| Size | 29 MB | 24 MB |
| Requires iOS | **10.0** | 18.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Michael Eskin](https://appshunter.io/developer/342739369) | [Dylan Shade](https://appshunter.io/developer/1564023750) |

## What reviewers say

### B

[App page](https://appshunter.io/ios/app/b-system-cba-accordion-tutor/id1037609940)

Learn the notes on the treble side of a B-System Chromatic Button Accordion with a built-in note guide. Features high-quality sampled notes and a responsive button board for melodies and chords. Connect to external speakers for amplified sound.

**Highlights:** Built-in note guide, High-quality sampled notes, Responsive button board, Melody and chord playing, External speaker support, Toggleable note names

**Features:** Vision Pro support

**In-app purchases:** none


### 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


## Frequently asked questions

### Is B free?

B costs $1.99, with no in-app purchases.

### Is Functional Harmony free?

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

### Which has better reviews, B or Functional Harmony?

Functional Harmony is rated higher. B averages 3.5 out of 5 from 2 ratings, while Functional Harmony averages 4.9 from 25 ratings.

### Do B or Functional Harmony have ads?

Neither B nor Functional Harmony shows ads.

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

B ships an update every 9 months, and Functional Harmony every 6 months. Most recently, B was updated on October 29, 2026 and Functional Harmony on October 24, 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.*