# B vs 音壳

The clearest difference is review sentiment: 音壳 at 96% against B's 50%. 音壳 also leads on price (Free vs $1.99) and rating (5.0 vs 3.5). B's advantage is in-app purchases (none vs 12) and iOS requirement (10.0 vs 12.0). On ads and device support there is nothing between them.

音壳 is free to download; B costs $1.99 up front. 音壳 sells 11 one-off in-app purchases. B asks for nothing beyond the download.

音壳 holds the better App Store score, 5.0 against 3.5. That said, the two scores are not equally well evidenced: 音壳 has 19 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 96% of 音壳's.

B ships an update every 9 months, 音壳 fortnightly. The most recent releases landed on November 2, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | B | 音壳 |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | [3.5 (2 ratings)](https://appshunter.io/ios/app/b-system-cba-accordion-tutor/id1037609940/reviews) | **[5.0 (19 ratings)](https://appshunter.io/ios/app/app/id1209335292/reviews)** |
| Number of ratings | 2 | **19** |
| Positive reviews | 50.0% of reviews | **96.4% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Fortnightly** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 29 MB | 179 MB |
| Requires iOS | **10.0** | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Michael Eskin](https://appshunter.io/developer/342739369) | [鑫 孟](https://appshunter.io/developer/1264513934) |

## 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


### 音壳

[App page](https://appshunter.io/ios/app/app/id1209335292)

Master music theory, sight-singing, and ear training with comprehensive exercises. This app helps beginners and advanced learners improve their music reading, pitch accuracy, and understanding of intervals, chords, and rhythms. It offers customizable practice and a supportive community for musical growth.

**Highlights:** Music theory lessons and exercises, Sight-singing pitch evaluation, Interval, chord, and scale ear training, Rhythm and melody practice, Customizable practice modes, Pure, realistic instrument sounds, Q&A and community forum

**Features:** Vision Pro support

**In-app purchases (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1金币 | $0.99 | one-time |
| 8乐点 | $0.99 | one-time |
| 1个月 | $0.99 | one-time |
| 18乐点 | $2.99 | one-time |
| 1个月 | $3.99 | one-time |
| 40乐点 | $5.99 | one-time |
| 1个月 | $14.99 | one-time |
| 108乐点 | $15.99 | one-time |
| 3个月音壳VIP会员 | $21.99 | one-time |
| 12个月 | $54.99 | one-time |
| 12个月艺考VIP会员 | $449.99 | one-time |


## Frequently asked questions

### Is B free?

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

### Is 音壳 free?

音壳 is free to download, with in-app purchases available.

### Which has better reviews, B or 音壳?

音壳 is rated higher. B averages 3.5 out of 5 from 2 ratings, while 音壳 averages 5.0 from 19 ratings.

### Do B or 音壳 have ads?

Neither B nor 音壳 shows ads.

### Which is updated more often, B or 音壳?

B ships an update every 9 months, and 音壳 fortnightly. Most recently, B was updated on November 2, 2026 and 音壳 on October 29, 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.*