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7 Best MQTT Client Tools Worth Trying in 2024

Guowei Li
Jan 20, 2024
7 Best MQTT Client Tools Worth Trying in 2024


In the era of rapid Internet of Things (IoT) advancement, the MQTT protocol has become an integral component for numerous companies and developers. The utilization of MQTT client tools has become commonplace, facilitating seamless connections to MQTT brokers for various functions such as publishing, subscribing, and exchanging messages.

Selecting the right tool is paramount for developers seeking to delve into MQTT features and streamline the debugging process of IoT applications, ultimately reducing the development cycle. The plethora of available MQTT client tools, each with distinct functional focuses, presents a challenge for developers when deciding on the most suitable option.

This blog curates a list of seven of the most valuable MQTT client tools for the year 2024. Organized into Desktop, Browser, Command Line, and Mobile categories, this selection aims to assist you in swiftly identifying the ideal tool for your MQTT development endeavors.

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.

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MQTT Desktop Client Tools


MQTTX is an elegant cross-platform MQTT 5.0 desktop client that runs on macOS, Linux, and Windows. Its user-friendly chat-style interface enables users to 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 and support for codecs like Hex, Base64, and JSON payloads.

MQTTX is an open-source project developed with Electron and maintained by the EMQX team. The latest release is version 1.9.2 by the end of April 2023.

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



  • 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


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

MQTT Explorer


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



MQTT Online Client Tools


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: http://www.emqx.io/online-mqtt-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.Cool Test Client



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



  • 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


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


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.

    MQTT Benchmark

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


  • 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


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 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.




This blog presents an extensive overview of MQTT client tools across various categories. Notably, MQTTX emerges as a rapidly evolving client tool distinguished by its modern chat-style interface, comprehensive MQTT 5.0 support, and extensive features that contribute to an exceptional user experience. Available in three versions - Desktop, Command Line, and Browser - MQTTX excels in meeting MQTT testing needs across diverse scenarios. Without a doubt, MQTTX secures its position as one of the premier MQTT client tools in 2024.

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