# Auto Compose Music Box vs Solo Harmony

The clearest difference is update cadence: Solo Harmony at every 7 months against Auto Compose Music Box's every 16 months. On price, ads, in-app purchases and device support there is nothing between them.

Auto Compose Music Box costs $0.99 and Solo Harmony $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Auto Compose Music Box ships an update every 16 months, Solo Harmony every 7 months. The most recent releases landed on October 26, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Auto Compose Music Box | Solo Harmony |
| --- | --- | --- |
| Price | $0.99 | $0.99 |
| Rating | — | **[4.0 (3 ratings)](https://appshunter.io/ios/app/solo-harmony/id6446134271/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 20.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 16 months | **Every 7 months** |
| Monetization | — | Paid |
| Size | 58 MB | 1 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [masafumi sasaki](https://appshunter.io/developer/1016775706) | [Masanori Katsuta](https://appshunter.io/developer/320172788) |

## What reviewers say

### Auto Compose Music Box

[App page](https://appshunter.io/ios/app/auto-compose-music-box/id1440027553)

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

**In-app purchases:** none


### Solo Harmony

[App page](https://appshunter.io/ios/app/solo-harmony/id6446134271)

This app synthesizes harmony parts with your solo singing in real-time. Mix up to five harmony parts using an ad-lib keyboard and adjust pitch for chorus effects. Record and playback synthesized sounds, or use it for karaoke practice.

**Highlights:** Ad-lib Harmony Mix engine, Real-time multi-part mixing, Subtle pitch shift for chorus effect, Recording and playback, Input from microphone, files, and other apps, Karaoke practice mode

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

**In-app purchases:** none


## Frequently asked questions

### Is Auto Compose Music Box free?

Auto Compose Music Box costs $0.99, with no in-app purchases.

### Is Solo Harmony free?

Solo Harmony costs $0.99, with no in-app purchases.

### Do Auto Compose Music Box or Solo Harmony have ads?

Neither Auto Compose Music Box nor Solo Harmony shows ads.

### Which is updated more often, Auto Compose Music Box or Solo Harmony?

Auto Compose Music Box ships an update every 16 months, and Solo Harmony every 7 months. Most recently, Auto Compose Music Box was updated on October 26, 2026 and Solo Harmony on November 3, 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.*