MQTT Spy vs YAML Tools
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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.
YAML Tools
A comprehensive YAML utility for developers on iOS. Visualize, format, convert, and generate code from YAML files. Includes validation and a dedicated syntax keyboard for efficient editing.
- Interactive Tree and Table View for YAML visualization
- Convert YAML to JSON, XML, CSV, and more
- Generate type-safe model classes for multiple languages
- Real-time JSON Schema generation and validation
- Dedicated YAML syntax keyboard overlay
- Format and minify YAML structures
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The ultimate YAML toolkit for developers. Visualize, validate, convert, and generate code - all in one powerful, beautifully designed iOS app. YAML Tools is the professional-grade YAML utility built for developers who demand speed, precision, and versatility. Whether you're editing Kubernetes configs, debugging CI/CD pipelines, or generating type-safe model classes, YAML Tools handles it all natively on iPhone and iPad. Visualize & Explore Dive into your YAML with an interactive Tree View and path-based querying. Use the Table View to inspect sequences like a spreadsheet. Rainbow column highlighting makes CSV/TSV output instantly readable. Format & Transform Prettify nested structures with smart indentation or strip whitespace with the Minify engine. Convert YAML to JSON, XML, CSV, TSV, TOML, HTML, Markdown, Base64, and more instantly. Generate Production-Ready Code Export type-safe model classes for Dart, Swift, Kotlin, Java, Python, TypeScript, and C# with intelligent property singularization and pluralization. Stop writing boilerplate, YAML Tools writes it for you. Validate with Confidence Auto-generate JSON Schema from any YAML document, then validate payloads against it in real time. Catch structural errors before they reach production. Built for iOS A dedicated YAML syntax keyboard overlay, native Document Picker integration, and background processing keep the experience fast and fluid, even on large configuration files.
Screenshots
Verdict
The clearest difference is rating: YAML Tools at 5.0 against MQTT Spy's 4.0. YAML Tools also leads on in-app purchases (none vs 1) and ads (none vs shown). MQTT Spy's advantage is price ($0.99 vs $3.99) and iOS requirement (10.0 vs 15.6). On ratings volume and device support 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
MQTT Spy costs $0.99 and YAML Tools $3.99 up front. MQTT Spy sells 1 one-off in-app purchase. YAML Tools asks for nothing beyond the download.
YAML Tools holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
MQTT Spy ships an update every 4 months, YAML Tools monthly. The most recent releases landed on November 7, 2026 and November 5, 2026 respectively.
| Parameter | MQTT Spy | YAML Tools |
|---|---|---|
| Price | $0.99 — better | $3.99 |
| Rating | 4.0 (1 ratings) | 5.0 (1 ratings) — better |
| Number of ratings | 1 | 1 |
| Update frequency | Every 4 months | Monthly — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Best chart rank | — | #88 — better |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad, iPod |
| Requires iOS | 10.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 26 MB | 30 MB |
| Age rating | 4+ | 4+ |
| Developer | Gopi Gadhiya | Mohammed Aadhil |
Customer experience
MQTT Spy
YAML Tools
In-app purchases
MQTT Spy
- Remove Ads$2.99
YAML Tools
No in-app purchases








