# Blue Box vs Frequency Sound Generator App

The clearest difference is price: Frequency Sound Generator App at Free against Blue Box's $4.99. Frequency Sound Generator App also leads on ratings volume (4.8K vs 3) and update cadence (every 2 months vs every 7 months). Blue Box's advantage is rating (5.0 vs 4.5) and in-app purchases (none vs 2). On device support and iOS requirement there is nothing between them.

Frequency Sound Generator App is free to download; Blue Box costs $4.99 up front. Frequency Sound Generator App sells 2 in-app purchases, starting at $5.99 per 7 days. Blue Box asks for nothing beyond the download.

Blue Box holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Frequency Sound Generator App has 4.8K ratings behind it against 3, so its average is the more settled of the two. Written reviews complicate that: 56% of Blue Box's written reviews are positive against 66% of Frequency Sound Generator App's, so the app with the better star average is not the one people write more warmly about.

Blue Box ships an update every 7 months, Frequency Sound Generator App every 2 months. The most recent releases landed on September 11, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Blue Box | Frequency Sound Generator App |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/blue-box/id391832739/reviews)** | [4.5 (4.8K ratings)](https://appshunter.io/ios/app/frequency-sound-generator-app/id1238160553/reviews) |
| Number of ratings | 3 | **4.8K** |
| Positive reviews | 55.6% of reviews | **66.3% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 7 months | **Every 2 months** |
| Monetization | **Paid** | Subscription |
| Best chart rank | **#192** | — |
| Size | 2 MB | 36 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sunshine Valley Systems](https://appshunter.io/developer/327149814) | [Min Ku](https://appshunter.io/developer/1204192873) |

## What reviewers say

### Blue Box

[App page](https://appshunter.io/ios/app/blue-box/id391832739)

**Currently charting:** #192 Top Paid · Utilities (US App Store)

Encode and decode DTMF signals using your device's microphone or keypad. Play back tone sequences with adjustable settings, and save them for easy recall. Explore various tone systems, including trunk control and coin signals, for educational and utility purposes.

**Highlights:** Encode/decode DTMF signals, Adjustable tone, delay, and volume, US, UK, and European tone systems, Multi-frequency and trunk control tones, Coin tone sequences (Red Box mode), Custom tone creation, Save and organize sequences

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

**In-app purchases:** none


### Frequency Sound Generator App

[App page](https://appshunter.io/ios/app/frequency-sound-generator-app/id1238160553)

Generate sound frequencies from 1Hz to 25,000Hz with a simple interface. Features include wave visualization, adjustable sensitivity, and multiple waveform options. Use it for hearing tests, pet training, or as a prank tool.

**Highlights:** Frequency range 1Hz to 25,000Hz, Wave visualization, Adjustable sensitivity, Multiple waveforms (Sine, Square, Sawtooth, Triangle), Custom frequency range, Logarithmic and Linear slider modes

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited Access Weekly Plan | $5.99 | per 7 days |
| Unlimited Access Yearly Plan | $19.99 | per year |

**What reviewers like**

- 👍 Helpful for tinnitus
- 🚀 Accurate frequency generation
- 🎉 Great for meditation and relaxation
- 💡 Useful for testing speaker systems
- 🔍 Ability to test hearing range

**What reviewers complain about**

- 🐛 Difficulty adjusting precise frequencies
- 🔊 Extremely high frequencies can be painful
- 🔋 Stops playing when screen is locked
- 📢 Excessive ads
- 🤔 Mosquito repellent feature not effective

**Reported bugs**

- Frequency slider is overly sensitive
- Displayed frequency doesn't match actual output
- Inconsistent behavior between 'Play' and 'Mode' buttons

**Requested features**

- Option to save favorite frequencies
- Ability to type in specific frequency values
- Background playback support
- Paid ad-free version


## Frequently asked questions

### Is Blue Box free?

Blue Box costs $4.99, with no in-app purchases.

### Is Frequency Sound Generator App free?

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

### Which has better reviews, Blue Box or Frequency Sound Generator App?

Blue Box is rated higher. Blue Box averages 5.0 out of 5 from 3 ratings, while Frequency Sound Generator App averages 4.5 from 4.8K ratings.

### Do Blue Box or Frequency Sound Generator App have ads?

Frequency Sound Generator App shows ads; Blue Box does not.

### Which is updated more often, Blue Box or Frequency Sound Generator App?

Blue Box ships an update every 7 months, and Frequency Sound Generator App every 2 months. Most recently, Blue Box was updated on September 11, 2026 and Frequency Sound Generator App on September 24, 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.*