EMQX

EMQX is an MQTT platform for connecting devices and processing IoT data in real time. It suits teams building connected-device services that need messaging, data routing, and several deployment choices. Its breadth supports production use, while the free cloud tier’s capacity and message-size limits call for an early check against workload needs.

Overview

EMQX Enterprise combines real-time MQTT publish/subscribe messaging with durable message queuing, bringing two common parts of device-data handling into one platform. EMQX says a cluster can support up to 100 million concurrent MQTT connections, a scale ceiling that will matter most to operators planning large fleets. Delivery guarantees are configurable, giving teams control over message handling.

Teams can deploy with Docker, the Kubernetes Operator, or installation packages, or choose a managed cloud plan. The HTTP management API follows OpenAPI 3.0, which suits teams that want programmatic administration. EMQX began as a project in 2013, and EMQ was founded in 2017.

Key features

MQTT is the core, with support also spanning MQTT-SN, STOMP, CoAP, LwM2M, OCPP, GB/T 32960, JT/T 808, and NATS; QUIC is among the offered protocols and gateways. That range can help teams connect varied devices and systems through one platform. Buyers with specialized fleets should verify that the required protocol and gateway combinations are covered.

A SQL-based Rule Engine and visual Flow Designer support filtering, transformation, enrichment, and routing. These tools let teams shape device data as it moves through the platform, reducing the need to treat routing as a separate concern. More than 50 native integrations include Kafka, PostgreSQL, MongoDB, AWS, Azure, OpenAI, Anthropic, and Google Gemini, giving teams several ways to connect brokers, databases, cloud services, and AI services.

Security controls include TLS/mTLS, X.509 certificate authentication, access controls, and audit logs. EMQ’s trust center describes ISO/IEC 27001:2022 and TISAX certifications and says SOC 2 Type 1 reports are available for EMQX Cloud and EMQX Enterprise. The HTTP management API adds a standard interface for administration.

Pricing

Serverless is free at $0 / Month, with usage-based charges beyond its monthly free quota. It includes up to 1,000 connections, free monthly allowances for sessions, traffic, and rule actions, TLS/SSL, and 8/5 support. The plan’s stated ceilings are up to 1,000 sessions, up to 1,000 TPS, and a 1 MB message size. It is a sensible starting point for smaller workloads, but those limits and the usage-based billing make it less suited to traffic that needs higher capacity or larger messages.

Dedicated Flex starts at $234 / Month and includes a single-tenant dedicated VPC, 40+ integrations, a 99.99% uptime SLA, 24/7 premium support, and a 14-day trial. It fits teams that need dedicated hosting, a defined uptime commitment, and round-the-clock support. The starting price is a substantial step up from Serverless, so it is best justified by those operational needs.

BYOC uses custom pricing for deployment in your own VPC, managed upgrades and observability, and tailored compliance. It is the option for teams that need to keep deployment in their cloud environment while receiving managed operations. Enterprise also uses custom pricing and offers unlimited sessions, unlimited TPS, and a 256 MB message size, making it the better fit when Serverless ceilings are too restrictive.

Platforms

EMQX supports API access, Linux, macOS, self-hosted deployment, and web access. Docker, the Kubernetes Operator, and installation packages give infrastructure teams several ways to run it, including on Linux and macOS. The mix of self-managed and cloud options suits organizations with different hosting requirements.

Who it's for

EMQX is a strong fit for IoT teams that need MQTT messaging alongside data processing, routing, and connections to a wide range of services. Its protocol support and deployment choices serve teams managing varied device fleets, while Dedicated Flex and Enterprise address workloads that outgrow Serverless limits. Smaller projects can start on the free plan, provided its session, throughput, and message-size caps fit their traffic.

Pros and cons

• Pros: Combines MQTT messaging and durable queuing, with configurable delivery guarantees.
• Pros: Broad protocol support, visual and SQL-based data routing, and 50+ native integrations can reduce the number of separate tools needed for device-data flows.
• Pros: Self-hosted, managed cloud, and own-VPC deployment options accommodate different infrastructure and compliance needs.
• Cons: Serverless is capped at 1,000 sessions, 1,000 TPS, and 1 MB per message, which can constrain growing or larger-message workloads.
• Cons: Dedicated Flex starts at $234 / Month, and BYOC and Enterprise require custom pricing, making higher-capacity plans a more considered purchase.

Alternatives

HiveMQ MQTT Broker is another freemium MQTT broker; its Lab plan allows 100 connections and 100 messages per second based on a normalized 5 KB message size, while Launch is $299/mo.

Aiven for Apache Kafka is worth considering for Kafka workloads: its free plan provides 250 KiB/s throughput, three days of retention, five topics, and two partitions per topic, while Developer costs $35.00 per month.

Confluent Cloud offers a free Basic plan with serverless managed Kafka clusters, autoscaling Kafka resources, and 80+ managed connectors, making it an option for teams centered on Kafka.

RabbitMQ is a free, self-managed broker with community-based best-effort support.

Apache Pulsar is a free option from the Apache Software Foundation.

Apache Qpid Broker-J is a free broker with no paid plan or usage limits stated.

Apache RocketMQ is free open-source software under the Apache License 2.0.

Eclipse Mosquitto is a free on-premises option focused on core MQTT features.

For broader category comparisons, see Message Queue (MQ) Software and Message Broker Software.

Verdict

Choose EMQX if your IoT workload needs MQTT messaging, data processing, broad protocol support, and deployment flexibility in one platform. The strongest reason to look elsewhere is capacity economics: Serverless has firm ceilings, while dedicated service starts at $234 / Month and higher-end plans use custom pricing.