Auto Compose Music Box vs Solo Harmony
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Auto Compose Music Box
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The ball falling from a random position creates music. In the scene using the sound of chorus of Africa, the chorus echoes along the circulation code which changes at regular intervals. The scene using the Japanese koto.It is tuned by the sound used in the "sea of spring(haru no umi)", so you can taste the atmosphere without discomfort. In Gamelan's scene, percussion instruments and whistles are tuned by the Gamelan scale (5 scale), and unique music is produced. You can set the frequency, falling speed, and number of falling balls, so you can play according to the setting. At the end of the performance you can save all the parameters at that time. The position of the ball made randomly is recorded as it is. Since it is played with exactly the same parameters, almost the same music can be reproduced. However, because it is a problem of numerical precision, it will not be exactly the same performance, so do not be afraid.
Solo Harmony
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.
- 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
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Automatically harmonizes with your solo singing. ◆ Equipped with an [Ad-lib Harmony Mix] engine, allowing you to synthesize harmony parts with ad-lib performances while singing. ◆ Use the ad-lib keyboard to mix up to 5 parts simultaneously in real-time. ◆ The subtle pitch shift setting allows you to produce a chorus effect. ◆ Supports recording and playback of synthesized sounds. ◆ Supports not only microphone input, but also recording files and shared files from other apps. ◆ You can mix harmony parts while playing audio files. ◆ Useful for practicing karaoke harmony by playing the original vocals quietly and the harmony parts loudly. ◆ Recorded files can be sent to AirDrop, SNS, etc. as shared files. ● Notes: ・To prevent howling, the app automatically disables the microphone input signal while playing audio files. ・When using Bluetooth earphones, it may not be possible to monitor the sound being recorded.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Auto Compose Music Box | Solo Harmony |
|---|---|---|
| Price | $0.99 | $0.99 |
| Rating | — | 4.0 (3 ratings) — better |
| Positive reviews | — | 20.0% of reviews |
| Number of ratings | — | 3 — better |
| Update frequency | Every 16 months | Every 7 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 58 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | masafumi sasaki | Masanori Katsuta |
In-app purchases
Auto Compose Music Box
No in-app purchases
Solo Harmony
No in-app purchases
Questions
Is Auto Compose Music Box free?
Is Solo Harmony free?
Do Auto Compose Music Box or Solo Harmony have ads?
Which is updated more often, Auto Compose Music Box or Solo Harmony?
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