# Blue Box vs DataLeft

The clearest difference is price: DataLeft at Free against Blue Box's $4.99. DataLeft also leads on update cadence (every 2 weeks vs every 7 months). Blue Box's advantage is in-app purchases (none vs 1) and device support (3 vs 1). On ads there is nothing between them.

DataLeft is free to download; Blue Box costs $4.99 up front. DataLeft sells 1 one-off in-app purchase. Blue Box asks for nothing beyond the download.

Blue Box ships an update every 7 months, DataLeft every 2 weeks. The most recent releases landed on September 30, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Blue Box | DataLeft |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/blue-box/id391832739/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 55.6% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 2 weeks** |
| Monetization | Paid | — |
| Size | 2 MB | 1 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Sunshine Valley Systems](https://appshunter.io/developer/327149814) | [Oh Hyeon Kwon](https://appshunter.io/developer/926648394) |

## 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


### DataLeft

[App page](https://appshunter.io/ios/app/dataleft/id6790156499)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| DataLeft Pro | $2.99 | one-time |


## Frequently asked questions

### Is Blue Box free?

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

### Is DataLeft free?

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

### Do Blue Box or DataLeft have ads?

Neither Blue Box nor DataLeft shows ads.

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

Blue Box ships an update every 7 months, and DataLeft every 2 weeks. Most recently, Blue Box was updated on September 30, 2026 and DataLeft on October 1, 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.*