Best MQTT Brokers Compared: Mosquitto vs EMQX vs HiveMQ vs Managed

Every MQTT broker routes messages from publishers to subscribers, and every serious one supports MQTT 3.1.1 and 5. The real differences lie in scale, operations and licensing: how it clusters, what it is written in, what it costs to run and who maintains it. This comparison sticks to well-known, verifiable facts — no made-up benchmarks — and ends with a practical guide to choosing.

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MQTT brokers at a glance

For a feature-by-feature matrix you can filter, use the interactive MQTT broker comparison.

Eclipse Mosquitto

Mosquitto is the most widely used open-source broker and the default choice for small and medium deployments. It is written in C, runs comfortably on a Raspberry Pi or an edge gateway, and is configured with one text file. It ships with the mosquitto_pub and mosquitto_sub command-line clients that most MQTT tutorials use.

• Strengths: tiny footprint, simple setup, mature, packaged for most Linux distributions and available as an official Docker image.
• Limits: single node — no built-in clustering; you can bridge brokers together, but sessions are not shared. Authentication is file- or plugin-based.

Get started with installing Mosquitto, the mosquitto.conf generator and the test.mosquitto.org public broker.

EMQX

EMQX, developed by EMQ Technologies, is written in Erlang/OTP and designed for clustering and very large numbers of concurrent connections. Beyond plain MQTT it includes a SQL-like rule engine, data integrations with databases and streaming platforms, a web dashboard, and built-in authentication and authorization backends.

• Strengths: native clustering, rich feature set out of the box, good observability, extras such as shared-subscription strategies and the $queue prefix.
• Limits: heavier to run and operate than Mosquitto; review the license of the version you deploy.

Try it via the EMQX public broker.

HiveMQ

HiveMQ is a Java-based broker with a strong enterprise focus. The open-source HiveMQ Community Edition is a full MQTT 3.1.1 and 5 broker for single-node use with an extension SDK. Clustering, enterprise security, monitoring and commercial support are part of HiveMQ Enterprise, and HiveMQ also offers a managed cloud service.

• Strengths: spec-compliant, well documented, strong commercial support and tooling for regulated industries.
• Limits: clustering requires the commercial edition; the JVM needs more memory than C-based brokers.

Try it via the HiveMQ public broker.

VerneMQ and NanoMQ

VerneMQ

VerneMQ is an Apache-licensed, Erlang-based broker with built-in clustering and MQTT 5 support. It is a solid option if you want open-source clustering under a permissive license. Check the project's current release cadence and how official binary packages are distributed before committing to it.

NanoMQ

NanoMQ, also from EMQ, is a lightweight C broker aimed at edge devices and gateways. It supports MQTT 5, bridging to cloud brokers and MQTT over QUIC. Think of it as an edge-side companion to a central broker rather than a replacement for one.

Managed and cloud MQTT brokers

A managed broker removes the operational work — patching, TLS certificates, monitoring, backups and scaling — in exchange for a subscription. Options include:

• HiveMQ Cloud and EMQX Cloud — hosted versions of the brokers above.
• AWS IoT Core and Azure IoT Hub / Azure Event Grid — MQTT endpoints that are part of larger cloud IoT platforms. They tie into each cloud's identity and data services but use platform-specific authentication and, in some cases, a restricted subset of MQTT features or topic structures.
• ConnectMQ — a managed MQTT broker providing private, isolated instances with username/password authentication, per-topic access control, TLS and secure WebSockets, and support for MQTT 3.1.1 and 5. See ConnectMQ in our broker list.

Managed services differ mostly in pricing model, connection and message limits, which MQTT 5 features they expose, and whether they use standard username/password auth or proprietary identity schemes. Compare those against your requirements rather than against marketing claims.

How to choose an MQTT broker

1. Learning, prototyping or home automation: Mosquitto on a Raspberry Pi or in Docker, or a free public test broker. See Home Assistant MQTT for a common setup.
2. Edge gateways: Mosquitto or NanoMQ, bridged to a central broker.
3. Production with high availability on your own infrastructure: a clustering broker such as EMQX, VerneMQ or HiveMQ Enterprise — and a team comfortable operating it.
4. Deep integration with one cloud provider: that provider's IoT service, if its MQTT feature subset fits your devices.
5. Production without running servers: a managed broker with standard MQTT, TLS and per-device credentials.

Whatever you pick, check these points before committing:

• Protocol features you rely on: MQTT 5 properties, shared subscriptions, retained messages, message size limits. See MQTT 5 vs 3.1.1.
• Transports: TCP, TLS and WebSockets for browser clients — see MQTT ports.
• Security: authentication, per-topic ACLs and TLS. Our MQTT security best practices list what to look for.
• Operations: monitoring, upgrades, backups and who gets paged at night.

Test before you decide

Whichever brokers make your shortlist, run the same checks against each: connect over every transport you need, verify QoS and retained messages, and confirm your authentication setup works. Our guide on how to test an MQTT broker walks through it step by step.

Frequently asked questions