Comparison

MQTT Spy vs SourceView Pro

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

MQTT Spy

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
Read full description

INTRODUCTION: - MQTT Spy is used for testing pub/sub protocol with MQTT - Simply create a MQTT connection with broker and test MQTT messaging - With this app, You can control any MQTT enabled IoT devices and monitor sensors with pub/sub protocol. FEATURES: - Save broker list - Separate panels for subscribe and publish data - Custom your own buttons for frequent publishing of same data. - Monitoring receiving data as ASCII or HEX. - Publish Data as ASCII or HEX. - Auto send commands at timed interval - Selection for \r \n at the end of sending data. - Send Log file of Subscribed and Published data. - Keep Screen on/off option.

About

SourceView Pro

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
Read full description

SourceView Pro brings the power of desktop web development to your iOS Safari browser. View and analyze the source code of any webpage with a sleek, professional interface and powerful features designed for developers, designers, and web enthusiasts. Key Features: • Beautiful Syntax Highlighting • Professional code highlighting with neon-style theme • Clear, readable formatting optimized for mobile • Customizable font sizes for comfortable viewing • Advanced Formatting Options • Pretty Print HTML for better readability • Line wrapping options • Adjustable text size • Copy formatted or raw source code • Fast & Efficient • Instant source code access through Safari extension • Works offline - no internet required for processing • Quick copy-to-clipboard functionality • Privacy Focused • Works completely offline • No data collection • No tracking • No analytics • Developer Friendly • View any webpage's HTML source • Analyze website structures • Learn from other developers' code • Perfect for debugging and learning • Professional Design • Dark mode interface • Clean, modern UI • Optimized for iOS devices • Intuitive controls Perfect for: Web Developers UI/UX Designers Students learning web development Digital marketers analyzing websites Anyone interested in web technology Download SourceView Pro today and unlock professional source code viewing capabilities on your iOS device!

Screenshots

MQTT Spy4 screens
SourceView Pro4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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

Scorecard7 real differences · 4 level
MQTT Spy versus SourceView Pro: the parameters behind the verdict, then further details
ParameterMQTT SpySourceView Pro
Price$0.99$0.99
Rating4.0 (1 ratings) — better—
Positive reviews—33.3% of reviews
Number of ratings1 — better—
Update frequencyEvery 4 monthsEvery 5 days — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
Best chart rank—#119 — better
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad
Requires iOS10.0 — better17.6
Further details — not scored
Size26 MB14 MB
Age rating4+4+
DeveloperGopi GadhiyaDor Pascal

Customer experience

MQTT Spy

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

SourceView Pro

Written reviews3 reviews
Positive33.3%
Neutral33.3%
Negative33.3%

In-app purchases

1 purchases

MQTT Spy

One-time1
  • Remove Ads$2.99
None

SourceView Pro

No in-app purchases

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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