# Blue Box vs Frequency

The clearest difference is review sentiment: Blue Box at 56% against Frequency's 0%. Blue Box also leads on rating (5.0 vs 3.9) and in-app purchases (none vs 10). Frequency's advantage is price (Free vs $4.99) and update cadence (every 10 days vs every 7 months). On ads, device support and iOS requirement there is nothing between them.

Frequency is free to download; Blue Box costs $4.99 up front. Frequency sells 9 in-app purchases, starting at $7.99 per 7 days. Blue Box asks for nothing beyond the download.

Blue Box holds the better App Store score, 5.0 against 3.9. That said, the two scores are not equally well evidenced: Frequency has 24 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 56% of Blue Box's written reviews are positive against 0% of Frequency's.

Blue Box ships an update every 7 months, Frequency every 10 days. The most recent releases landed on September 11, 2026 and September 7, 2026 respectively.

## The numbers

| Metric | Blue Box | Frequency |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/blue-box/id391832739/reviews)** | [3.9 (24 ratings)](https://appshunter.io/ios/app/frequency-hz-tone-generator/id1671426872/reviews) |
| Number of ratings | 3 | **24** |
| Positive reviews | **55.6% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 10 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Best chart rank | **#192** | — |
| Size | 2 MB | 16 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Sunshine Valley Systems](https://appshunter.io/developer/327149814) | [Optimize IT](https://appshunter.io/developer/1671426874) |

## 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

[App page](https://appshunter.io/ios/app/frequency-hz-tone-generator/id1671426872)

Generate precise audio frequencies for various purposes, from tuning instruments to cleaning water from speakers. Explore different waveforms and customize sound generation for unique audio experiences. Elevate your audio quality and functionality.

**Highlights:** Generate frequencies from 1 Hz to 40,000 Hz, Clean water/moisture from speakers, Produce sine, triangle, sawtooth, and square waveforms, Tune musical instruments, Select notes and octaves for specific pitches, Play multiple frequencies simultaneously

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

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium | $7.99 | per 7 days |
| Weekly | $9.99 | per 7 days |
| Weekly VIP | $9.99 | per 7 days |
| Monthly Premium | $17.99 | per month |
| Monthly | $19.99 | per month |
| Annual VIP | $24.99 | per year |
| Annual Premium | $24.99 | per year |
| Annual VIP | $29.99 | per year |
| Annual | $29.99 | per year |


## Frequently asked questions

### Is Blue Box free?

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

### Is Frequency free?

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

### Which has better reviews, Blue Box or Frequency?

Blue Box is rated higher. Blue Box averages 5.0 out of 5 from 3 ratings, while Frequency averages 3.9 from 24 ratings.

### Do Blue Box or Frequency have ads?

Neither Blue Box nor Frequency shows ads.

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

Blue Box ships an update every 7 months, and Frequency every 10 days. Most recently, Blue Box was updated on September 11, 2026 and Frequency on September 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.*