The open-source EMQX alternative with no enterprise tier.
EMQX is a mature MQTT broker. FluxMQ ships clustering, durable queues, AMQP support, and 500K+ connections per node — all under Apache 2.0 with no features locked behind a commercial edition.
Why do teams look for an EMQX alternative?
EMQX Community Edition is Apache 2.0 but several production-grade capabilities — including durable queue persistence, advanced data bridging, and priority support — require EMQX Enterprise, which is commercially licensed. Teams that want full feature access under a single open-source license often evaluate FluxMQ or other Apache-licensed brokers.
What EMQX is good at.
EMQX is a production-proven MQTT broker used by organisations globally. It has a large ecosystem and strong enterprise support.
EMQX's Erlang-based distribution layer is battle-tested for large-scale multi-node deployments.
Extensive rule engine, data bridge connectors, and authentication plugins available in the enterprise edition.
Large user base, extensive documentation, and regular releases backed by EMQ Technologies.
EMQX ships a web dashboard for monitoring connections, topics, and subscriptions.
Where FluxMQ is different.
EMQX is an MQTT broker. FluxMQ natively speaks MQTT, AMQP 0.9.1, AMQP 1.0, CoAP, and HTTP-MQTT — all routing through the same Queue Manager. No separate broker for enterprise AMQP services.
EMQX bundles the Erlang/OTP runtime. FluxMQ is a single compiled Go binary. No runtime to configure, no OTP distribution protocol, no node cookies. Drop it in and run.
Consumer groups, offset tracking, dead-letter queues, and Kafka-style retention are in FluxMQ's Apache 2.0 release — not locked behind a commercial tier.
FluxMQ uses embedded etcd for cluster coordination and gRPC with mTLS for inter-broker communication. No Erlang distribution protocol tuning needed to build a cluster.
FluxMQ vs EMQX — feature by feature.
| Feature | FluxMQ | EMQX Community |
|---|---|---|
| MQTT 3.1.1 & 5.0 | Yes | Yes |
| AMQP 0.9.1 | Yes | No |
| AMQP 1.0 | Yes | No |
| CoAP bridge | Yes | Yes (plugin) |
| Built-in clustering | Yes (embedded etcd) | Yes (Erlang distribution) |
| Durable queues with consumer groups | Yes | Enterprise edition only |
| Dead-letter queues | Yes | Enterprise edition only |
| Single binary, no runtime deps | Yes (Go binary) | No (Erlang/OTP runtime bundled) |
| License | Apache 2.0 (all features) | Apache 2.0 (community) / Commercial (enterprise) |
| Implementation language | Go | Erlang/OTP |
Sources: EMQX documentation (emqx.com/docs), FluxMQ source code and documentation (github.com/absmach/fluxmq). EMQX Enterprise features based on publicly documented Enterprise Edition capabilities.
Apache 2.0. All features. One binary.
No enterprise edition. No feature flags. No commercial upgrade path. Everything ships in the open-source release.
Common questions.
What is the main difference between FluxMQ and EMQX?
FluxMQ is a single Go binary with no external runtime dependencies and ships all features — clustering, durable queues, AMQP support — under Apache 2.0. EMQX is a well-established Erlang broker with a large community edition and a separate enterprise edition that unlocks features like advanced rule engines and data persistence. FluxMQ targets teams that want full capability under a single open-source license without a commercial upgrade path.
Does FluxMQ support AMQP like EMQX?
FluxMQ supports both AMQP 0.9.1 and AMQP 1.0 natively. EMQX does not have native AMQP support — it is an MQTT broker. If your architecture needs to bridge MQTT IoT devices with AMQP-based enterprise services, FluxMQ handles both protocols on the same broker core.
Is EMQX Community Edition fully open source?
Yes, EMQX Community Edition is Apache 2.0. However, certain enterprise-grade features — including advanced data bridging, durable queue persistence, and priority support — are only available in EMQX Enterprise, which is commercially licensed.
Is FluxMQ suitable for the same scale as EMQX?
FluxMQ targets high-throughput IoT deployments: 500K+ concurrent connections and 300K–500K messages/sec per node, scaling linearly with cluster size. EMQX is also designed for large-scale deployments. Teams should evaluate both against their specific workload characteristics.
How difficult is it to operate FluxMQ compared to EMQX?
FluxMQ is a single Go binary. Configuration is a YAML file. No Erlang runtime, no node cookie management, no OTP distribution protocol tuning. For teams not already running Erlang infrastructure, the operational surface is significantly smaller.
Which should I choose for an IoT platform like Magistrala?
Both can serve as the message broker for an IoT platform. FluxMQ is the recommended broker for Magistrala deployments — it integrates with Magistrala's device identity and RBAC layer out of the box and is developed by the same team.
Try FluxMQ.
Open source, Apache 2.0, single Go binary. Run it with Docker Compose in under five minutes.