# Soi vs HarmonyAngel

The clearest difference is in-app purchases: Soi at none against HarmonyAngel's 4. Soi also leads on iOS requirement (10.3 vs 17.0). HarmonyAngel's advantage is update cadence (every 4 weeks vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. HarmonyAngel sells 4 in-app purchases, starting at $0.99 per 7 days. Soi asks for nothing beyond the download.

Soi ships an update every 2 months, HarmonyAngel every 4 weeks. The most recent releases landed on October 11, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Soi | HarmonyAngel |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (2 ratings)](https://appshunter.io/ios/app/soi/id986051970/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 weeks** |
| Monetization | Free | — |
| Size | 28 MB | 7 MB |
| Requires iOS | **10.3** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Aero Deko](https://appshunter.io/developer/507882387) | [Better World Studio](https://appshunter.io/developer/424394067) |

## What reviewers say

### Soi

[App page](https://appshunter.io/ios/app/soi/id986051970)

Create and improvise music with others in real-time. This expressive instrument allows groups of any size to perform together, automatically harmonizing and synchronizing participants for an engaging experience where there are no wrong notes.

**Highlights:** Real-time music creation, Group improvisation, Automatic harmonization, Participant synchronization, Ensemble performance

**In-app purchases:** none


### HarmonyAngel

[App page](https://appshunter.io/ios/app/harmonyangel/id6794364693)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Subscription | $0.99 | per 7 days |
| Monthly Subscription | $1.99 | per month |
| Yearly Subscription | $9.99 | per year |
| Life-time Purchase | $19.99 | one-time |


## Frequently asked questions

### Is Soi free?

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

### Is HarmonyAngel free?

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

### Do Soi or HarmonyAngel have ads?

Neither Soi nor HarmonyAngel shows ads.

### Which is updated more often, Soi or HarmonyAngel?

Soi ships an update every 2 months, and HarmonyAngel every 4 weeks. Most recently, Soi was updated on October 11, 2026 and HarmonyAngel on October 10, 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.*