# Modbus TCP Pro vs MQTT Debug & Analyzer Client

The clearest difference is review sentiment: Modbus TCP Pro at 100% against MQTT Debug & Analyzer Client's 50%. MQTT Debug & Analyzer Client's advantage is price (Free vs $11.99) and update cadence (fortnightly vs every 5 weeks). On ads, in-app purchases and device support there is nothing between them.

MQTT Debug & Analyzer Client is free to download; Modbus TCP Pro costs $11.99 up front. Modbus TCP Pro sells 1 one-off in-app purchase and MQTT Debug & Analyzer Client sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

Modbus TCP Pro ships an update every 5 weeks, MQTT Debug & Analyzer Client fortnightly. The most recent releases landed on September 10, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Modbus TCP Pro | MQTT Debug & Analyzer Client |
| --- | --- | --- |
| Price | $11.99 | **Free** |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Fortnightly** |
| Monetization | **Free** | Subscription |
| Size | 2 MB | 18 MB |
| Requires iOS | 26.1 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Bernard Struelens](https://appshunter.io/developer/1802500832) | [小玲 王](https://appshunter.io/developer/1573722736) |

## What reviewers say

### Modbus TCP Pro

[App page](https://appshunter.io/ios/app/modbus-tcp-pro/id6756293575)

This tool allows professionals to test, read, and write Modbus registers directly from their iPhone. It offers robust connectivity and support for various data types, making it ideal for field testing and debugging industrial control systems.

**Highlights:** Modbus TCP connectivity, Read and write registers, Support for multiple data types, Configurable Unit ID, Instant feedback and error reporting, Designed for testing and debugging, Field testing without a laptop

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Modbus Pro | $24.99 | one-time |


### 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 Modbus TCP Pro free?

Modbus TCP Pro costs $11.99, and also offers in-app purchases.

### Is MQTT Debug & Analyzer Client free?

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

### Do Modbus TCP Pro or MQTT Debug & Analyzer Client have ads?

Neither Modbus TCP Pro nor MQTT Debug & Analyzer Client shows ads.

### Which is updated more often, Modbus TCP Pro or MQTT Debug & Analyzer Client?

Modbus TCP Pro ships an update every 5 weeks, and MQTT Debug & Analyzer Client fortnightly. Most recently, Modbus TCP Pro was updated on September 10, 2026 and MQTT Debug & Analyzer Client on September 23, 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.*