# 39Tools vs MQTT Debug & Analyzer Client

The clearest difference is in-app purchases: 39Tools at none against MQTT Debug & Analyzer Client's 3. 39Tools also leads on iOS requirement (12.0 vs 15.0). MQTT Debug & Analyzer Client's advantage is update cadence (every 3 weeks vs every 9 months). On price, ads and device support there is nothing between them.

Both are free to download. MQTT Debug & Analyzer Client sells 3 in-app purchases, starting at $2.99 per month. 39Tools asks for nothing beyond the download.

39Tools ships an update every 9 months, MQTT Debug & Analyzer Client every 3 weeks. The most recent releases landed on October 3, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | 39Tools | MQTT Debug & Analyzer Client |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 3 weeks** |
| Monetization | — | Subscription |
| Size | 112 MB | 18 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [策 王](https://appshunter.io/developer/1681706231) | [小玲 王](https://appshunter.io/developer/1573722736) |

## What reviewers say

### 39Tools

[App page](https://appshunter.io/ios/app/39tools/id6447797534)

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

**In-app purchases:** none


### MQTT Debug & Analyzer Client

[App page](https://appshunter.io/ios/app/mqtt-debug-and-analyzer-client/id6759897721)

This utility helps IoT developers and network engineers debug, monitor, and analyze MQTT traffic. It offers advanced connectivity, full MQTT 5.0 support, and intuitive data visualization tools. Seamlessly integrates with major IoT platforms.

**Highlights:** Advanced connectivity (TCP, WebSockets, SSL/TLS), MQTT 5.0 protocol support, Syntax highlighting for JSON, XML, text, Hex view for binary data, Real-time charts for numerical payloads, Chat-style message history, Broker compatibility with major platforms

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MQTT Month Pro | $2.99 | per month |
| MQTT Yearly Pro | $4.99 | per year |
| MQTT Lifetime Pro | $5.99 | one-time |


## Frequently asked questions

### Is 39Tools free?

39Tools is free to download, with no in-app purchases.

### Is MQTT Debug & Analyzer Client free?

MQTT Debug & Analyzer Client is free to download, with in-app purchases available.

### Do 39Tools or MQTT Debug & Analyzer Client have ads?

Neither 39Tools nor MQTT Debug & Analyzer Client shows ads.

### Which is updated more often, 39Tools or MQTT Debug & Analyzer Client?

39Tools ships an update every 9 months, and MQTT Debug & Analyzer Client every 3 weeks. Most recently, 39Tools was updated on October 3, 2026 and MQTT Debug & Analyzer Client on October 9, 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.*