# RadioSI vs Harmonaut

The clearest difference is update cadence: Harmonaut at every 10 days against RadioSI's every 7 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

RadioSI ships an update every 7 months, Harmonaut every 10 days. Both last shipped on October 8, 2026.

## The numbers

| Metric | RadioSI | Harmonaut |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (6 ratings)](https://appshunter.io/ios/app/harmonaut/id6784680994/reviews)** |
| Number of ratings | — | **6** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 10 days** |
| Monetization | — | Free with in-app purchases |
| Size | 40 MB | 117 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [eAvio](https://appshunter.io/developer/975269533) | [District One Mobile, LLC](https://appshunter.io/developer/812513884) |

## What reviewers say

### RadioSI

[App page](https://appshunter.io/ios/app/radiosi/id1490073951)

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

**In-app purchases:** none


### Harmonaut

[App page](https://appshunter.io/ios/app/harmonaut/id6784680994)

Create music by feel without needing music theory. This app generates rich chords and smooth progressions, allowing you to shape the mood with intuitive controls. Save and reorder your musical ideas effortlessly.

**Highlights:** Play by feel, no theory required, Shape mood with tension and brightness faders, Smooth voice leading for flowing progressions, Chords named for musicians, Save and reorder progressions, Works on iPhone and iPad

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RadioSI free?

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

### Is Harmonaut free?

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

### Do RadioSI or Harmonaut have ads?

Neither RadioSI nor Harmonaut shows ads.

### Which is updated more often, RadioSI or Harmonaut?

RadioSI ships an update every 7 months, and Harmonaut every 10 days. Most recently, RadioSI was updated on October 8, 2026 and Harmonaut on October 8, 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.*