Top 7 MQTT Client Tools for Developers in 2025

Introduction

As the Internet of Things (IoT) continues to advance in 2025, the MQTT protocol remains a cornerstone for reliable, lightweight messaging across connected devices. To efficiently test, debug, and manage MQTT-based applications, developers rely on a wide range of MQTT client tools.

The right MQTT client can significantly improve your development and troubleshooting process—whether you're publishing and subscribing to topics, simulating device behavior, or monitoring real-time data streams. However, with so many MQTT tools available—each offering unique features and user experiences—choosing the best one for your specific use case can be challenging.

In this blog post, we’ve curated a list of the 7 best MQTT client tools to try in 2025, organized by Desktop, Browser, Command Line, and Mobile platforms. Whether you’re just getting started with MQTT or looking for a more advanced tool to streamline your IoT workflows, this guide will help you find the ideal solution.

How to Choose an MQTT Client?

A good MQTT client tool should possess the following key features.

• Support for one-way and two-way SSL authentication.
• Support for MQTT 5 features.
• Maintain ease of use on a full-featured basis.
• Support for multiple clients online at the same time.
• Cross-platform, available under different operating systems.
• Support MQTT over WebSocket.
• Advanced features: Customized script, logging, payload format conversion, etc.

Prerequisite: Prepare an MQTT Broker

Before diving into the MQTT desktop tools, we need an MQTT Broker to communicate and test. We choose the free public MQTT broker available on broker.emqx.io.

MQTT Broker Info

• Server: broker.emqx.io
• TCP Port: 1883
• WebSocket Port: 8083
• SSL/TLS Port: 8883
• Secure WebSocket Port: 8084

For more information, please check out: Free Public MQTT Broker.

A Practical Guide to MQTT Broker Selection

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MQTT Desktop Client Tools

MQTTX

MQTTX is an elegant cross-platform MQTT 5.0 desktop client that runs on macOS, Linux, and Windows. Its user-friendly chat-style interface lets users easily create multiple MQTT/MQTTS connections and subscribe/publish MQTT messages.

MQTTX fully supports MQTT versions 5.0 and 3.1.1, MQTT over TLS, MQTT over WebSocket, and one-way and two-way SSL authentication. In addition to these essential features, MQTTX offers advanced functionality, such as customizable scripts for MQTT Pub/Sub simulation, payload codec support (Hex, Base64, JSON), and an AI-powered Copilot that helps generate test data, MQTT client code in various languages, and message schemas based on your connection context and test data. With integrated Model Context Protocol (MCP) support, Copilot can connect to external databases and services, enabling intelligent, code-free MQTT testing and interaction.

MQTTX is an open-source project developed with Electron and maintained by the EMQX team. The latest stable release is version 1.11.0 (December 2024). Enhancement of AI and MCP features is available starting from version 1.12.0-beta (March 2025).

GitHub Project: https://github.com/emqx/mqttx

Features

• User-friendly and easy-to-use UX design
• Chatbox for sending/receiving MQTT messages
• Fully support for MQTT versions 5.0, 3.1.1 and 3.1
• Support MQTT over TLS, and MQTT over WebSocket
• Support for one-way and two-way SSL authentication
• Hex, Base64, JSON, and Plaintext payload codec
• Customized colors for different MQTT subscriptions
• Customized script for MQTT Pub/Sub scenario simulation
• Cross-platform, running on Windows, macOS, and Linux
• AI-powered MQTTX Copilot: Simplifying MQTT testing and development
• AI-powered MQTTX Copilot: Boosts MQTT productivity with LLMs; enables smart workflows via MCP

Installation

• Homebrew

  brew install --cask mqttx
  

• Download

  https://mqttx.app/

MQTT Explorer

MQTT Explorer is an open-source MQTT client tool that provides an easy-to-use graphical user interface (GUI) with a structured topic overview. It adopts a hierarchical main view and supports a visual chart display of received payload messages.

MQTT Explorer supports MQTT 5.0 and 3.1.1 protocols and allows developers to simultaneously create one MQTT/MQTTS connection.

MQTT Explorer is written in TypeScript and developed by Thomas Nordquist. It’s cross-platform and can run on Windows, macOS, and Linux.

GitHub: https://github.com/thomasnordquist/MQTT-Explorer

Features

Quote from MQTT Explorer

• Visualize topics and a dynamic preview of the change of topic
• Delete the retained topics
• Search/filter topics
• Recursive delete topics
• Difference view of current and previously received messages
• Publish topics
• Draw digital topics
• Retain the historic record of every topic
• Dark/Light topic

Download

https://mqtt-explorer.com/

MQTT Online Client Tools

MQTTX Web

MQTTX Web is a user-friendly, browser-based tool for online debugging, developing, and testing MQTT applications. It connects to an MQTT broker via a WebSocket client and offers an intuitive interface.

Developed by the EMQX team, MQTTX Web is an open-source tool that supports MQTT 3.1.1 and MQTT 5.0 protocols and WebSocket transports. It is licensed under Apache Version 2.0.

GitHub Project: https://github.com/emqx/MQTTX/tree/main/web

Try Now: https://mqttx.app/web-client/

Additionally, MQTTX Web supports private deployment using Docker, which is beneficial when only a browser is available, or for testing in restricted intranet environments. Deploy from Docker Image:

docker pull emqx/mqttx-web
docker run -d --name mqttx-web -p 80:80 emqx/mqttx-web

MQTT.Cool Test Client

MQTT.Cool Test Client is a very simple and linear GUI (based on the MQTT.Cool API) through which you can test the interaction between the MQTT.Cool server and MQTT brokers. It supports connecting to the broker via MQTT TCP in the browser.

Try Now: https://testclient-cloud.mqtt.cool/

MQTT CLI Tools

MQTTX CLI

MQTTX CLI is a lightweight and easy-to-use MQTT 5.0 command line tool. With various commands for MQTT publishing, subscribing, benchmarking, and IoT data simulation, it is one of the most powerful tools for MQTT development.

MQTTX CLI is an open-source project written in Node.js and developed by the EMQX team. It’s cross-platform and can work on Windows, macOS, and Linux.

GitHub Project: https://github.com/emqx/MQTTX/tree/main/cli

Features

• Fully support for MQTT versions 5.0, 3.1.1 and 3.1
• Cross-platform compatibility with Windows, MacOS, and Linux
• Dependency-free setup allowing for quick installation without prerequisites
• Easy to integrate, can be quickly integrated into automated test scripts
• Supports CA, self-signed certificates, and one-way and two-way SSL authentication
• Performance testing capabilities for quickly evaluating MQTT service performance
• Scenario-based MQTT message simulation with custom and built-in options

Installation

MQTTX CLI is compatible with Windows, macOS, and Linux. For additional installation options, please consult the documentation.

• Docker

  docker pull emqx/mqttx-cli
  docker run -it --rm emqx/mqttx-cli
  

• Homebrew

  brew install emqx/mqttx/mqttx-cli
  

• Download

  https://mqttx.app/cli

Usage Example

• Connect

  Test connecting to an MQTT broker:

  mqttx conn -h 'broker.emqx.io' -p 1883 -u 'test' -P 'test'
  

• Subscribe

  Subscribe to an MQTT topic:

  mqttx sub -t 'topic/#' -h 'broker.emqx.io' -p 1883
  

• Publish

  Publish a QoS1 message to an MQTT topic:

  mqttx pub -t 'topic' -q 1 -h 'broker.emqx.io' -p 1883 -m 'Hello from MQTTX CLI'
  

• Publishing multiple messages

  The MQTTX CLI also supports publishing multiple messages. Add a -M parameter and a -s parameter to the command in the editor, and newline it after each entry.

  

• Benchmark

  For MQTTX CLI, the bench command is easy to use and concise in its content output. For a large number of connections, subscriptions, and publications, the display method has been optimized by dynamically updating the real-time numbers to avoid being overwhelmed by a large number of output logs during use.

  

Mosquitto CLI

Mosquitto is a widely used open-source MQTT broker with the popular mosquitto_pub and mosquitto_sub command line clients. This CLI tool offers a wide range of options to connect, subscribe to, and publish messages to an MQTT broker.

The Mosquitto project is written in C/C++ and maintained by the Eclipse Foundation. Mosquitto is highly portable and can be deployed on various platforms, including Linux, Mac, Windows, and Raspberry Pi.

GitHub Project: https://github.com/eclipse/mosquitto

Features

• Lightweight and easy to use
• Support for MQTT v3.1.1 and v5.0 protocols
• Extensive command-line parameters
• Support for SSL/TLS encryption/authentication
• MQTT v5.0 request/response functionality

Installation

• Docker

  docker pull eclipse-mosquitto
  

• Homebrew

  brew install mosquitto
  

• Download

  https://mosquitto.org/download/

Usage Example

• Publish

  Publish a QoS1 message to an MQTT topic:

  mosquitto_pub -t 'topic' -q 1 -h 'broker.emqx.io' -p 1883 -m 'Hello from Mosquitto CLI'
  

• Subscribe

  Subscribe to an MQTT topic:

  mosquitto_sub -t 'topic/#' -h 'broker.emqx.io' -p 1883
  

• Request/Response

  mosquitto_rr -t 'req-topic' -e 'rep-topic' -m 'request message' -h 'broker.emqx.io'
  mosquitto_pub -t 'rep-topic' -m 'response message' -h 'broker.emqx.io'
  

MQTT Mobile Client Tools

EasyMQTT

EasyMQTT is an MQTT client for iPhone, iPad, and macOS, allowing you to interact with any MQTT Broker. Use it to manage your own setup at home, control things like Zigbee2MQTT or monitor a remote broker. It features a simple, user friendly interface, supporting both light and dark modes.

Download

https://apps.apple.com/us/app/easymqtt/id1523099606?platform=iphone

Conclusion

This blog offers a comprehensive overview of the best MQTT client tools in 2025. Among them, MQTTX stands out as a fast-evolving and developer-friendly client, featuring a sleek chat-style interface, full MQTT 5.0 support, and a robust feature set for publishing, subscribing, and real-time debugging.

Available in three flexible editions—MQTTX Desktop, MQTTX CLI, and MQTTX Web—it caters to a wide range of MQTT testing and development scenarios. More importantly, MQTTX is pioneering the integration of AI capabilities, enabling intelligent message generation, enhanced interaction through AI-assisted workflows, and more possibilities with MCP integration. These innovations help developers accelerate testing and streamline MQTT-based application development like never before.

With its modern design, AI-enhanced productivity, and continuous feature evolution, MQTTX has secured its position as one of the top MQTT client tools to use in 2025.

Related Resources

• MQTT Broker: How It Works, Popular Options, and Quickstart
• Free MQTT Broker: Exploring Options and Choosing the Right Solution
• MQTT Platform: Essential Features & Use Cases
• MQTT Client Tools 101: A Beginner's Guide
• Mastering MQTT: Your Ultimate Tutorial for MQTT