# Blue Harmonica vs Sonic Frequency Generator

The clearest difference is in-app purchases: Blue Harmonica at none against Sonic Frequency Generator's 2. Blue Harmonica also leads on iOS requirement (11.0 vs 16.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Sonic Frequency Generator sells 2 in-app purchases, starting at $2.99 per month. Blue Harmonica asks for nothing beyond the download.

Blue Harmonica ships an update fortnightly, Sonic Frequency Generator every 3 weeks. The most recent releases landed on October 10, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Blue Harmonica | Sonic Frequency Generator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (40 ratings)](https://appshunter.io/ios/app/blue-harmonica/id1474522151/reviews)** | — |
| Number of ratings | **40** | — |
| Positive reviews | 83.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 3 weeks |
| Monetization | Free | — |
| Size | 13 MB | 26 MB |
| Requires iOS | **11.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Piotr Ruchwa](https://appshunter.io/developer/1474522150) | [Umi Indigo LLC](https://appshunter.io/developer/1679236790) |

## What reviewers say

### Blue Harmonica

[App page](https://appshunter.io/ios/app/blue-harmonica/id1474522151)

This application helps harmonica players tune their instrument and identify notes in real-time. It supports various harmonica tunings and allows users to highlight different musical scales.

**Highlights:** Real-time note detection, Supports multiple harmonica tunings, Highlights various musical scales, Adjustable key support, Visual feedback for notes played

**Features:** macOS Compatibility

**In-app purchases:** none


### Sonic Frequency Generator

[App page](https://appshunter.io/ios/app/sonic-frequency-generator/id6464337686)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $2.99 | per month |
| Annual Premium | $8.99 | per year |


## Frequently asked questions

### Is Blue Harmonica free?

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

### Is Sonic Frequency Generator free?

Sonic Frequency Generator is free to download, with in-app purchases available.

### Do Blue Harmonica or Sonic Frequency Generator have ads?

Neither Blue Harmonica nor Sonic Frequency Generator shows ads.

### Which is updated more often, Blue Harmonica or Sonic Frequency Generator?

Blue Harmonica ships an update fortnightly, and Sonic Frequency Generator every 3 weeks. Most recently, Blue Harmonica was updated on October 10, 2026 and Sonic Frequency Generator on October 7, 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.*