Comparison

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.

Head to head
About

Auto Compose Music Box

Features
Read full description

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.

About

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.

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
Read full description

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

Auto Compose Music Box4 screens
Solo Harmony4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard1 real difference · 9 level
Auto Compose Music Box versus Solo Harmony: the parameters behind the verdict, then further details
ParameterAuto Compose Music BoxSolo Harmony
Price$0.99$0.99
Rating—4.0 (3 ratings) — better
Positive reviews—20.0% of reviews
Number of ratings—3 — better
Update frequencyEvery 16 monthsEvery 7 months — better
AdsNoNo
In-app purchasesNoNo
Monetization—Paid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better13.0
Further details — not scored
Size58 MB1 MB
Age rating4+4+
Developermasafumi sasakiMasanori Katsuta

In-app purchases

None

Auto Compose Music Box

No in-app purchases

None

Solo Harmony

No in-app purchases

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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