# DTMF Decoder vs Blue Box

The clearest difference is rating: Blue Box at 5.0 against DTMF Decoder's 2.5. Blue Box also leads on review sentiment (56% vs 40%) and update cadence (every 7 months vs every 19 months). DTMF Decoder's advantage is price ($0.99 vs $4.99) and ratings volume (17 vs 3). On ads, in-app purchases and device support there is nothing between them.

DTMF Decoder costs $0.99 and Blue Box $4.99 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 2.5. That said, the two scores are not equally well evidenced: DTMF Decoder has 17 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 40% of DTMF Decoder's written reviews are positive against 56% of Blue Box's.

DTMF Decoder ships an update every 19 months, Blue Box every 7 months. The most recent releases landed on September 23, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | DTMF Decoder | Blue Box |
| --- | --- | --- |
| Price | **$0.99** | $4.99 |
| Rating | [2.5 (17 ratings)](https://appshunter.io/ios/app/dtmf-decoder/id306195275/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/blue-box/id391832739/reviews)** |
| Number of ratings | **17** | 3 |
| Positive reviews | 40.4% of reviews | **55.6% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 19 months | **Every 7 months** |
| Monetization | **Free** | Paid |
| Best chart rank | — | **#192** |
| Size | 5 MB | 2 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [dreadtech.com](https://appshunter.io/developer/306195278) | [Sunshine Valley Systems](https://appshunter.io/developer/327149814) |

## What reviewers say

### DTMF Decoder

[App page](https://appshunter.io/ios/app/dtmf-decoder/id306195275)

This utility transforms your iPhone into a DTMF tone decoder. It listens to DTMF tones through the microphone and displays the dialed numbers. Decoded digits can be easily copied to the clipboard for further use.

**Highlights:** DTMF tone decoding, Microphone input, Displays dialed numbers, Copy to clipboard, Source code available

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

**In-app purchases:** none


### 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


## Frequently asked questions

### Is DTMF Decoder free?

DTMF Decoder costs $0.99, with no in-app purchases.

### Is Blue Box free?

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

### Which has better reviews, DTMF Decoder or Blue Box?

Blue Box is rated higher. DTMF Decoder averages 2.5 out of 5 from 17 ratings, while Blue Box averages 5.0 from 3 ratings.

### Do DTMF Decoder or Blue Box have ads?

Neither DTMF Decoder nor Blue Box shows ads.

### Which is updated more often, DTMF Decoder or Blue Box?

DTMF Decoder ships an update every 19 months, and Blue Box every 7 months. Most recently, DTMF Decoder was updated on September 23, 2026 and Blue Box on September 11, 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.*