# Blue Box vs Antenna+

The clearest difference is price: Antenna+ at Free against Blue Box's $4.99. Antenna+ also leads on rating (5.0 vs 4.5) and update cadence (every 5 weeks vs every 7 months). Blue Box's advantage is in-app purchases (none vs 2) and ratings volume (4 vs 1). On review sentiment, ads, monetization model and device support there is nothing between them.

Antenna+ is free to download; Blue Box costs $4.99 up front. Antenna+ sells 2 in-app purchases, starting at $1.99 per month. Blue Box asks for nothing beyond the download.

Antenna+ holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 4 and 1 respectively. Written reviews point the same way: 56% of Blue Box's written reviews are positive against 60% of Antenna+'s.

Blue Box ships an update every 7 months, Antenna+ every 5 weeks. The most recent releases landed on November 6, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | Blue Box | Antenna+ |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | [4.5 (4 ratings)](https://appshunter.io/ios/app/blue-box/id391832739/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/antenna-plus-cwpdk31dtmf/id466305239/reviews)** |
| Number of ratings | **4** | 1 |
| Positive reviews | 55.6% of reviews | **60.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 5 weeks** |
| Monetization | Paid | Paid |
| Size | 2 MB | 11 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | +4 |
| Developer | [Sunshine Valley Systems](https://appshunter.io/developer/327149814) | [Verosocial Studio](https://appshunter.io/developer/354566841) |

## What reviewers say

### Blue Box

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

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


### Antenna+

[App page](https://appshunter.io/ios/app/antenna-plus-cwpdk31dtmf/id466305239)

This toolkit offers amateur radio operators and RF hobbyists essential formulas and instant results for antenna design, feedline loss, and signal utilities. It includes calculators for antenna length, frequency conversion, VSWR, and propagation planning, along with DTMF and Morse code tools.

**Highlights:** Antenna length calculators, Frequency-to-wavelength conversion, VSWR and ERP calculators, Horizon visibility and solar calculators, DTMF decoding/keying, Morse/PSK31 tools

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly All Access Pro Usage | $1.99 | per month |
| Antenna Pro lifetime Upgrade | $14.99 | one-time |


## Frequently asked questions

### Is Blue Box free?

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

### Is Antenna+ free?

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

### Which has better reviews, Blue Box or Antenna+?

Antenna+ is rated higher. Blue Box averages 4.5 out of 5 from 4 ratings, while Antenna+ averages 5.0 from 1 ratings.

### Do Blue Box or Antenna+ have ads?

Neither Blue Box nor Antenna+ shows ads.

### Which is updated more often, Blue Box or Antenna+?

Blue Box ships an update every 7 months, and Antenna+ every 5 weeks. Most recently, Blue Box was updated on November 6, 2026 and Antenna+ on November 1, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*