# MQTT Spy vs SourceView Pro

The clearest difference is in-app purchases: SourceView Pro at none against MQTT Spy's 1. SourceView Pro also leads on ads (none vs shown) and update cadence (every 5 days vs every 4 months). MQTT Spy's advantage is device support (4 vs 2) and iOS requirement (10.0 vs 17.6). On price there is nothing between them.

MQTT Spy costs $0.99 and SourceView Pro $0.99 up front. MQTT Spy sells 1 one-off in-app purchase. SourceView Pro asks for nothing beyond the download.

MQTT Spy ships an update every 4 months, SourceView Pro every 5 days. Both last shipped on October 27, 2026.

## The numbers

| Metric | MQTT Spy | SourceView Pro |
| --- | --- | --- |
| Price | $0.99 | $0.99 |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/mqtt-spy/id1564422794/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | — | 33.3% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 5 days** |
| Monetization | **Free with in-app purchases** | Paid |
| Best chart rank | — | **#120** |
| Size | 26 MB | 14 MB |
| Requires iOS | **10.0** | 17.6 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Gopi Gadhiya](https://appshunter.io/developer/1387816354) | [Dor Pascal](https://appshunter.io/developer/1773249483) |

## What reviewers say

### MQTT Spy

[App page](https://appshunter.io/ios/app/mqtt-spy/id1564422794)

This application allows for testing the pub/sub MQTT protocol. Connect to an MQTT broker to send and receive messages, control IoT devices, and monitor sensors. It offers features for saving broker lists, custom publishing buttons, and data monitoring in ASCII or HEX.

**Highlights:** Save broker list, Custom publish buttons, Monitor data as ASCII or HEX, Auto-send commands at intervals, Keep screen on/off option, Send log files

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


### SourceView Pro

[App page](https://appshunter.io/ios/app/sourceview-pro-web-inspector/id6737245127)

**Currently charting:** #120 Top Paid · Developer Tools (US App Store)

Analyze the source code of any webpage directly within your iOS Safari browser. This tool offers professional syntax highlighting, advanced formatting options, and efficient access to HTML, designed for developers and web enthusiasts.

**Highlights:** Syntax highlighting, Advanced formatting, Adjustable text size, Offline source code access, Privacy focused, Dark mode UI

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

**In-app purchases:** none


## Frequently asked questions

### Is MQTT Spy free?

MQTT Spy costs $0.99, and also offers in-app purchases.

### Is SourceView Pro free?

SourceView Pro costs $0.99, with no in-app purchases.

### Do MQTT Spy or SourceView Pro have ads?

MQTT Spy shows ads; SourceView Pro does not.

### Which is updated more often, MQTT Spy or SourceView Pro?

MQTT Spy ships an update every 4 months, and SourceView Pro every 5 days. Most recently, MQTT Spy was updated on October 27, 2026 and SourceView Pro on October 27, 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.*