Best Free MQTT Brokers of 2025

HiveMQ is the most trusted enterprise MQTT platform, purpose-built to connect anything via MQTT, communicate reliably, and control IoT data. The platform can be deployed anywhere, on-premise or in the cloud, giving developers the flexibility and freedom they need to evolve as their IoT deployment grows. HiveMQ is reliable under real-world stress, scales without limits, and provides enterprise-grade security to meet the needs of organizations at any stage of digital transformation. The extensible platform provides seamless connectivity to the leading data streaming, databases, and data analytics platforms, plus offers a custom SDK for a perfect fit in any stack.

Tatsoft's FactoryStudio provides the tools you need to quickly design secure and powerful industrial applications. Features include real-time data modeling and data logging, MQTT client/spB broker/spB, audit trails, alarms & incidents, visual SQL query gateway, high-performance smart screens, HTML5 dashboards. WPF drawing tools. iOS app, trends, annotations, reporting & much more! Programming scripts can be done in C#, VB.NET or JavaScript. You can get up and running in no time with ZERO client install and just 2 minutes server side installation. It includes many native protocol drivers for PLCs, DCSs, as well as support for other industry standards like OPC, MQTT, and more. Are you looking for a driver that we don't yet have? We also have a toolkit to help you develop protocol drivers! FactoryStudio is your data hub for your industrial ecosystem. It can be your link between IT, OT, real-time devices and your SQL data sources.

Redis Labs is the home of Redis. Redis Enterprise is the best Redis version. Redis Enterprise is more than a cache. Redis Enterprise can be free in the cloud with NoSQL and data caching using the fastest in-memory database. Redis can be scaled, enterprise-grade resilience, massive scaling, ease of administration, and operational simplicity. Redis in the Cloud is a favorite of DevOps. Developers have access to enhanced data structures and a variety modules. This allows them to innovate faster and has a faster time-to-market. CIOs love the security and expert support of Redis, which provides 99.999% uptime. Use relational databases for active-active, geodistribution, conflict distribution, reads/writes in multiple regions to the same data set. Redis Enterprise offers flexible deployment options. Redis Labs is the home of Redis. Redis JSON, Redis Java, Python Redis, Redis on Kubernetes & Redis gui best practices.

RabbitMQ is a lightweight solution that can be effortlessly deployed both on-premises and in cloud environments. It is compatible with various messaging protocols, making it versatile for different use cases. Furthermore, RabbitMQ can be configured in distributed and federated setups, which cater to demanding scalability and high availability needs. With a vast user base, it stands out as one of the leading open-source message brokers available today. Organizations ranging from T-Mobile to Runtastic leverage RabbitMQ, showcasing its adaptability for both startups and large enterprises. Additionally, RabbitMQ is compatible with numerous operating systems and cloud platforms, offering a comprehensive suite of development tools for popular programming languages. Users can deploy RabbitMQ using tools like Kubernetes, BOSH, Chef, Docker, and Puppet, facilitating seamless integration into their existing workflows. Developers can also create cross-language messaging solutions using their preferred programming languages, such as Java, .NET, PHP, Python, JavaScript, Ruby, and Go, enhancing its utility across various projects.

Coreflux is a next-generation IoT platform that emphasizes seamless integration, scalability and security. At its core: MQTT Broker is the platform's backbone. It facilitates real-time data communication and management between devices, regardless of protocol or manufacturer. Flux DSL is a proprietary domain-specific programming language that allows users to create event-driven workflows and orchestrate sophisticated IoT scenarios. Asset Management (Flux Assets), Manages a wide range of IoT Assets, from sensors to databases. Ensures optimal configuration and performance. Coreflux's integrated tools allow for precise orchestration of devices, workflows and automations. Coreflux is a flexible IoT management platform that can be used by IoT enthusiasts, enterprises, and developers. It can manage a small number of devices or networks with thousands.

Pro Edition for Eclipse Mosquitto is a pro version of the world's #1 MQTT broker that quickly, stably, and reliably transmits data between IoT devices. Compared to the popular open-source version, Pro Mosquitto offers professional MQTT broker and client administration and monitoring, MQTT High Availability, MQTT and REST API access, improved reliability, enhanced security, and professional support, making it an ideal solution for commercial use. Benefits: Performance: Benefit from the low usage of computing resources and easily maintain up to 1 million concurrent connections. Pro Mosquitto is written in C, which makes it even more lightweight and efficient than competitors. In addition, it can run on very low-spec embedded devices, e.g., single-core 600MHz ARM and 128MB RAM. Reliable and trusted by the global dev community: The product is a pro version of the most popular open-source MQTT broker with more than 500 million docker pulls worldwide, powered by up to 99.99% SLA to ensure business continuity. Professional services and support: Our team can help you solve any issue, ensuring your project's successful implementation and maintenance. In addition, one can also request us to provide them with professional services

Solace is a specialist in Event-Driven-Architecture (EDA), with two decades of experience providing enterprises with highly reliable, robust and scalable data movement technology based on the publish & subscribe (pub/sub) pattern. Solace technology enables the real-time data flow behind many of the conveniences you take for granted every day such as immediate loyalty rewards from your credit card, the weather data delivered to your mobile phone, real-time airplane movements on the ground and in the air, and timely inventory updates to some of your favourite department stores and grocery chains, not to mention that Solace technology also powers many of the world's leading stock exchanges and betting houses. Aside from rock solid technology, stellar customer support is one of the biggest reasons customers select Solace, and stick with them.

An MQTT Broker designed with enthusiasm to meet all your requirements for deploying and scaling IoT applications. It features a REST API, a comprehensive dashboard with customizable widgets, and an extensive data storage solution, among other capabilities. Users can quickly visualize a snapshot of their IoT devices, monitoring client connections and disconnections, as well as critical data through various dashboard widgets. The system also provides alerts and color-coded indicators based on different value triggers. A robust rules engine is included to convert MQTT messages, facilitating streamlined M2M communication automation. This engine supports event and timer-based rules, enabling users to define data patterns and automate corresponding actions. For secure device communication, a publish and subscribe messaging model is implemented with dual layers of security, employing SSL/TLS for connectivity and optional username/password authentication. Additionally, web security measures are in place for data viewing. To ensure high availability, the broker can operate multiple message brokers simultaneously, guaranteeing efficient message collection and publication from devices. This architecture assures a remarkable 99.99% success rate in data collection, ensuring reliability regardless of software challenges. Moreover, the system's flexibility allows for seamless integration with various IoT applications and services.

Mosca is compatible with any Node.js application and provides an executable for standalone operation. By running this executable, you can connect it to your chosen MQTT client. To utilize Mosca effectively, it is essential to create a configuration file that specifies the details of the communication broker. This setup allows for seamless integration and streamlined communication between your application and the MQTT client.

VerneMQ is a versatile open-source software solution that can be extended, and it comes with options for enterprise support. As a powerful and distributed MQTT broker, VerneMQ is designed to excel in performance, efficiently scaling both horizontally and vertically on standard hardware to accommodate numerous concurrent publishers and consumers while ensuring low latency and robust fault tolerance. It serves as a dependable messaging hub for IoT platforms and smart products, allowing developers to create mobile messaging services that require significantly less overhead compared to XMPP. This opens the door to innovative mobile applications that rely on low-latency, bi-directional communication, serving various sectors such as urban environments, residential areas, and transportation systems. Whether it’s managing mobile assets or transitioning from a small experimental project to a fully-fledged industrial application, VerneMQ adeptly manages all messaging needs. It enables users to monitor and control their devices deployed in the field, seamlessly connecting them with data centers, backend services, and mobile apps, reinforcing the reliability of VerneMQ as a central component of your communication infrastructure. With its capabilities, you can confidently rely on VerneMQ to unify and streamline your messaging processes across diverse platforms.

MQTTnet is an efficient library designed for .NET that facilitates MQTT communication. This library includes both an MQTT client and a broker, supporting the MQTT protocol all the way up to version 5. It is versatile and works well with nearly any version of the .NET Framework and various CPU architectures. Users can implement custom message interceptors, enabling them to modify or enhance any application message that is received. The library is lightweight since it focuses solely on the fundamental implementation of MQTT without unnecessary overhead. Additionally, it allows for multiple connected clients to operate using different protocol versions simultaneously, enhancing its flexibility and usability.

The Datacake platform enables you to implement various Industrial IoT applications, including condition monitoring, data logging, real-time dashboards, and comprehensive data analytics. You can easily connect devices and gateways using LoRaWAN or NB-IoT protocols. With options like MQTT and other interfaces, the platform offers flexibility in integration. Utilizing the Datacake IoT platform along with Ready-to-Use LoRaWAN sensors, you can effectively monitor water levels in various settings, whether in flowing streams, stagnant ponds, or storage containers. Additionally, the platform features modern online mapping tools that allow you to visualize the real-time locations of your IoT assets, such as sensors and machines, on Interactive Maps. You can also track the historical routes traversed by these devices, providing valuable insights directly on the map. Furthermore, you have the capability to upload images and position sensors within detailed floor plans, hall layouts, or other relevant diagrams. This functionality allows you to present on-site conditions to your customers in an intuitive manner. Data can be sent to your devices on Datacake using webhooks, and there are also payload decoders available for handling HTTP requests. By leveraging these features, businesses can enhance their operational efficiency and improve decision-making processes.

A dependable MQTT broker is crucial for any IoT initiative; however, the process of establishing, troubleshooting, monitoring, and managing one can be quite intricate and demanding. MQTTHQ serves as a load-balanced, multi-node MQTT broker cluster that is specifically crafted to deliver a reliable and robust broker for the creation of IoT products and applications. It accommodates both TCP and WebSocket connections to enhance accessibility. It's important to note that MQTTHQ operates as a public broker, meaning that any data transmitted through it can be seen by other users; therefore, refrain from sharing any sensitive or personal information. To uphold our promise of keeping the MQTTHQ public broker available as a free tool for IoT developers, we periodically implement upgrades and introduce new features, ensuring that the service remains current and effective. This ongoing development also helps us to address any issues that may arise and to enhance the overall user experience.

ZeroMQ, often referred to as ØMQ, 0MQ, or zmq, may appear to be just an embeddable networking library, yet it functions as a robust concurrency framework. It provides sockets that transmit atomic messages through various transport methods such as in-process, inter-process, TCP, and multicast. Users can establish N-to-N socket connections utilizing patterns like fan-out, publish-subscribe, task distribution, and request-reply. Its speed makes it suitable as the underlying framework for clustered applications, while its asynchronous I/O architecture enables the development of scalable multicore applications designed as asynchronous message-processing tasks. Furthermore, ZeroMQ supports a wide array of language APIs and is compatible with most operating systems, making it a versatile choice for developers. This flexibility allows for innovative solutions across diverse programming environments.

Fogwing is the next-generation Industrial IoT platform. It has features that allow you to create IoT Solutions for a variety of industrial use cases, including asset tracking, predictive maintenance, and asset monitoring. Without needing to be an expert in information technology, users can create and deploy IoT-based automation solutions. Extended data analytics allows for data-driven analytical processes that predict operational risks and take action at lower TCO.

FairCom EDGE makes it easy to integrate sensor and machine data at their source - be that a factory, water treatment facility, oil platform, wind farm, or other industrial site. FairCom EDGE is the first converged IoT/Industrial IoT hub in the world. It unifies messaging and persistence with an all-in one solution. It also offers browser-based administration, configuration, and monitoring. FairCom EDGE supports MQTT, OPC UA and SQL for machine-tomachine (M2M), communication, and HTTP/REST for monitoring and real-time reporting. It constantly retrieves data from sensors and devices with OPC UA support and receives messages from machines with MQTT support. The data is automatically parsed and persisted, and made available via MQTT or SQL.

Cassandana is a Java-based, open-source MQTT message broker that originated as a fork of Moquette and has since been enhanced with optimizations and additional features. After undergoing significant improvements, it is now equipped to function effectively as an enterprise-grade messaging solution. Its architecture includes an in-memory caching system designed to minimize input/output operations, thereby boosting performance and efficiency. Additionally, the project’s continuous development aims to ensure it meets the evolving needs of modern applications.

Eclipse Mosquitto is a message broker that is open source and licensed under EPL/EDL, designed to support various versions of the MQTT protocol, including 5.0, 3.1.1, and 3.1. This broker is notably lightweight, making it ideal for deployment on a wide range of devices, from low-power single-board computers to robust server systems. The MQTT protocol itself offers an efficient way to handle messaging through a publish/subscribe architecture, which is particularly well-suited for applications in the Internet of Things, enabling communication with low-power sensors or mobile devices like smartphones, embedded systems, and microcontrollers. In addition to the broker, the Mosquitto project also includes a C library that facilitates the creation of MQTT clients, alongside the widely used command line clients, mosquitto_pub and mosquitto_sub, which enhance user interaction with the MQTT protocol. Overall, Mosquitto serves as a versatile tool for developers aiming to implement messaging solutions in a variety of applications.