Softwr

Databases · head to head

RabbitMQ vs Apache Kafka

RabbitMQ logo

RabbitMQ

Databases

Open-source message broker supporting AMQP and other protocols

From
Free
Rated
-
Full reviewWebsite
Apache Kafka logo

Apache Kafka

Databases

Open-source distributed event streaming platform

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; Apache Kafka operationally heavy to self-host: brokers, storage, rebalancing and upgrades are a standing job, which is why managed Kafka is a large market
  • They diverge on capability: RabbitMQ covers Flexible routing, Apache Kafka covers Durable commit log.

Where they differ

Only the attributes on which RabbitMQ and Apache Kafka actually diverge.

Attributes where RabbitMQ and Apache Kafka differ
AttributeRabbitMQApache Kafka
PlatformsLinux, macOS, Windows, Docker, KubernetesLinux, Windows, macOS, Self-hosted, Docker

Identical on both: starting price (Free), pricing model (Open source, no licence fee; managed services billed separately), free tier (Yes), 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 Apache Kafka

  • Durable commit log
  • Horizontal scale
  • Kafka Connect
  • Kafka Streams
  • Replication
  • Low latency

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 Apache Kafka
  • Decoupling services that need delivery rather than a replayable historynot Apache Kafka
  • Routing messages by pattern to different consumers from one publishernot Apache Kafka

Apache Kafka

  • Moving events between services without point-to-point couplingnot RabbitMQ
  • Feeding analytics and warehouses from operational systems in near real timenot RabbitMQ
  • Replaying history to rebuild state after a consumer bugnot RabbitMQ
  • Buffering bursty producers ahead of slower downstream systemsnot 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

Apache Kafka

  • Operationally heavy to self-host: brokers, storage, rebalancing and upgrades are a standing job, which is why managed Kafka is a large market
  • Overkill for straightforward job queues, where a simpler broker is easier to run and reason about
  • Ordering guarantees hold per partition, not per topic, and getting partitioning wrong is a common and expensive design mistake
  • The ecosystem is fragmented across the Apache project and vendor distributions, so documentation and tooling advice often assume a particular distribution

Pricing, plan by plan

RabbitMQ

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

Apache Kafka

Free
  • Apache KafkaFree
    • Full platform
    • Kafka Connect
    • Kafka Streams

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 Apache Kafka if

  • You need durable commit log.
  • You want to start without paying.
  • You work on Linux, Windows, macOS, Self-hosted, Docker.
  • You also want horizontal scale.
Apache Kafka review

Questions people ask

Is RabbitMQ or Apache Kafka better?
Neither clearly leads. RabbitMQ starts at Free and Apache Kafka at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, RabbitMQ or Apache Kafka?
RabbitMQ starts at Free and Apache Kafka at Free.
Does RabbitMQ or Apache Kafka run on more platforms?
RabbitMQ runs on Linux, macOS, Windows, Docker, Kubernetes. Apache Kafka runs on Linux, Windows, macOS, Self-hosted, Docker.
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 Apache Kafka is typically brought in for.
What can RabbitMQ do that Apache Kafka cannot?
RabbitMQ covers Flexible routing, Multiple protocols, Management UI, Clustering and mirroring. Apache Kafka covers Durable commit log, Horizontal scale, Kafka Connect, Kafka Streams.

Answered from the vendors’ own pages

RabbitMQ: Is RabbitMQ free?

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

Apache Kafka: Is Apache Kafka free?

Yes. Kafka is open source under the Apache License v2 with no licence fee. Costs come from the infrastructure you run it on, or from a managed service such as Confluent Cloud.

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.

Apache Kafka: How is Kafka different from a message queue?

A queue usually removes a message once it is consumed. Kafka keeps an ordered, durable log, so consumers track their own position and history can be replayed — which is what makes rebuilding state after a bug possible.

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.

Apache Kafka: Who uses Kafka?

The project reports use by more than 80% of the Fortune 100, with over 5 million lifetime downloads.

Apache Kafka: Do I need to run Kafka myself?

No. Self-hosting is the operationally expensive option; managed services such as Confluent Cloud run the brokers for you and bill on throughput and storage instead.

Share

Related pages

More on RabbitMQ

More on Apache Kafka

Keep looking

Other head to heads