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Databases · head to head

RabbitMQ vs NATS

RabbitMQ logo

RabbitMQ

Databases

Open-source message broker supporting AMQP and other protocols

From
Free
Rated
-
Full reviewWebsite
NATS logo

NATS

Databases

High-performance messaging system for cloud-native applications

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: RabbitMQ not built for replay: once consumed, a message is gone, which is exactly what Kafka exists to change; NATS core NATS has no persistence at all, so messages are lost if no subscriber is listening
  • They diverge on capability: RabbitMQ covers Flexible routing, NATS covers Very low latency.

Where they differ

Only the attributes on which RabbitMQ and NATS actually diverge.

Attributes where RabbitMQ and NATS differ
AttributeRabbitMQNATS
Pricing modelOpen source, no licence fee; managed services billed separatelyOpen source, no licence fee

Identical on both: starting price (Free), free tier (Yes), platforms (Linux, macOS, Windows, Docker, Kubernetes), user rating (Not yet rated), category (Databases).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in RabbitMQ

  • Flexible routing
  • Multiple protocols
  • Management UI
  • Clustering and mirroring

Only in NATS

  • Very low latency
  • JetStream
  • Single binary
  • Request-reply

What people use each for

The jobs each tool is most often brought in to do.

RabbitMQ

  • Distributing background jobs to a pool of workers with retriesnot NATS
  • Decoupling services that need delivery rather than a replayable historynot NATS
  • Routing messages by pattern to different consumers from one publishernot NATS

NATS

  • Service-to-service messaging where latency is the binding constraintnot RabbitMQ
  • Edge and IoT messaging where a lightweight broker mattersnot RabbitMQ
  • Replacing a heavier broker when the workload does not need its guaranteesnot RabbitMQ

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

RabbitMQ

  • Not built for replay: once consumed, a message is gone, which is exactly what Kafka exists to change
  • Throughput ceilings are lower than a log-based platform under very heavy streaming loads
  • Queues that build up degrade broker performance, so consumer lag is an operational problem rather than just a backlog
  • Clustering and partition behaviour has historically been a source of hard-to-diagnose problems

NATS

  • Core NATS has no persistence at all, so messages are lost if no subscriber is listening
  • JetStream adds the durability but also the operational complexity NATS is chosen to avoid
  • A much smaller ecosystem than Kafka or RabbitMQ, with fewer connectors and integrations
  • Fewer people know it, so hiring and existing organisational knowledge favour the alternatives

Pricing, plan by plan

RabbitMQ

Free
  • RabbitMQFree
    • Full functionality
    • Self-hosted
    • No usage limits

NATS

Free
  • NATSFree
    • Full functionality
    • No usage limits
    • Community support

Which should you pick?

Choose RabbitMQ if

  • You need flexible routing.
  • You want to start without paying.
  • You work on Linux, macOS, Windows, Docker, Kubernetes.
  • You also want multiple protocols.
RabbitMQ review

Choose NATS if

  • You need very low latency.
  • You want to start without paying.
  • You work on Linux, macOS, Windows, Docker, Kubernetes.
  • You also want jetstream.
NATS review

Questions people ask

Is RabbitMQ or NATS better?
Neither clearly leads. RabbitMQ starts at Free and NATS at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, RabbitMQ or NATS?
RabbitMQ starts at Free and NATS at Free.
Does RabbitMQ or NATS run on more platforms?
Both run on Linux, macOS, Windows, Docker, Kubernetes, so platform support will not decide this one for you.
Can I use RabbitMQ for free?
Both have a free tier, so you can try either at no cost before committing.
What is RabbitMQ best used for?
RabbitMQ is most often used for distributing background jobs to a pool of workers with retries, decoupling services that need delivery rather than a replayable history, routing messages by pattern to different consumers from one publisher. Of those, distributing background jobs to a pool of workers with retries and decoupling services that need delivery rather than a replayable history are not what NATS is typically brought in for.
What can RabbitMQ do that NATS cannot?
RabbitMQ covers Flexible routing, Multiple protocols, Management UI, Clustering and mirroring. NATS covers Very low latency, JetStream, Single binary, Request-reply.

Answered from the vendors’ own pages

RabbitMQ: Is RabbitMQ free?

Yes, open source with no licence fee. Broadcom sells commercial support.

NATS: Is NATS free?

Yes, open source and CNCF-graduated. Synadia sells a managed service.

RabbitMQ: RabbitMQ or Kafka?

RabbitMQ is a message broker: simpler to run and better at flexible routing and work queues. Kafka is a replayable event log built for very high throughput streaming, and much heavier to operate.

NATS: Does NATS persist messages?

Core NATS does not — it is fire-and-forget. JetStream adds persistence, streaming and replay when you need them.

RabbitMQ: Can RabbitMQ replay messages?

Not in the way Kafka can. Messages are removed once acknowledged, so rebuilding state from history is not the model.

NATS: NATS or Kafka?

NATS is far lighter and lower latency, and much simpler to run. Kafka is the answer when you need a durable replayable log and a large connector ecosystem.

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