# Blue Box vs Selcall Selective Calling Tone

The clearest difference is rating: Blue Box at 5.0 against Selcall Selective Calling Tone's 3.2. Blue Box also leads on chart position (#192 vs unranked). Selcall Selective Calling Tone's advantage is update cadence (every 4 months vs every 7 months) and price ($2.99 vs $4.99). On review sentiment, ads, in-app purchases and device support there is nothing between them.

Blue Box costs $4.99 and Selcall Selective Calling Tone $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Blue Box holds the better App Store score, 5.0 against 3.2. Both are backed by a comparable volume of ratings — 3 and 14 respectively. Written reviews point the same way: 56% of Blue Box's written reviews are positive against 50% of Selcall Selective Calling Tone's.

Blue Box ships an update every 7 months, Selcall Selective Calling Tone every 4 months. The most recent releases landed on September 11, 2026 and August 25, 2026 respectively.

## The numbers

| Metric | Blue Box | Selcall Selective Calling Tone |
| --- | --- | --- |
| Price | $4.99 | **$2.99** |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/blue-box/id391832739/reviews)** | [3.2 (14 ratings)](https://appshunter.io/ios/app/selcall-selective-calling-tone/id547030339/reviews) |
| Number of ratings | 3 | **14** |
| Positive reviews | **55.6% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 4 months** |
| Monetization | Paid | **Free** |
| Best chart rank | **#192** | — |
| Size | 2 MB | 2 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sunshine Valley Systems](https://appshunter.io/developer/327149814) | [Black Cat Systems](https://appshunter.io/developer/301047032) |

## 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


### Selcall Selective Calling Tone

[App page](https://appshunter.io/ios/app/selcall-selective-calling-tone/id547030339)

Generate various selective calling tones for communication. Choose from over 20 tone types, queue multiple tones for burst transmission, and customize tone durations and gaps. Store frequently used sequences for quick access.

**Highlights:** Over 20 tone types, Tone queuing and burst transmission, Customizable tone duration and gap, Memory for storing tone sequences, CTCSS continuous tone generation, CODAN mode for priority calls

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

**In-app purchases:** none


## Frequently asked questions

### Is Blue Box free?

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

### Is Selcall Selective Calling Tone free?

Selcall Selective Calling Tone costs $2.99, with no in-app purchases.

### Which has better reviews, Blue Box or Selcall Selective Calling Tone?

Blue Box is rated higher. Blue Box averages 5.0 out of 5 from 3 ratings, while Selcall Selective Calling Tone averages 3.2 from 14 ratings.

### Do Blue Box or Selcall Selective Calling Tone have ads?

Neither Blue Box nor Selcall Selective Calling Tone shows ads.

### Which is updated more often, Blue Box or Selcall Selective Calling Tone?

Blue Box ships an update every 7 months, and Selcall Selective Calling Tone every 4 months. Most recently, Blue Box was updated on September 11, 2026 and Selcall Selective Calling Tone on August 25, 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.*