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Head-to-head · Message Broker Software

RabbitMQ vs Google Cloud Pub/Sub

  • Updated Oct 2026
  • Both researched from official sources
  • 3 checks side by side
Higher score RabbitMQ #1 in Message Broker Software 9.4/10 Free plan Free plan✓ 1 of 1 features Visit RabbitMQ
Google Cloud Pub/Sub #3 in Message Broker Software 9.1/10 Free plan Free plan✓ 1 of 1 features Visit Google Cloud

RabbitMQ leads on 1 check, Google Cloud Pub/Sub on 0, and 2 are even. Who comes out ahead on the 3 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreRabbitMQ · 9.4/10
  • Free planboth

RabbitMQ scores higher on our rubric for message broker software: 9.4 against 9.1 out of 10; our editors rank them #1 and #3.

On deployment model, RabbitMQ gives you Hybrid where Google Cloud Pub/Sub offers Cloud. RabbitMQ leads on maximum message size: 16 MB versus 10 MB.

RabbitMQ is the better fit for general-purpose open-source messaging. Google Cloud Pub/Sub is the better fit for managed cloud pub/sub.

  • RabbitMQ fits best

    General-purpose open-source messaging

  • Google Cloud Pub/Sub fits best

    Managed cloud pub/sub

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Side by side

Feature RabbitMQ 9.4/10 Visit ↗ Google Cloud Pub/Sub 9.1/10 Visit ↗
At a glance
Editor score 9.4 9.1
Ranking #1 in Message Broker Software #3 in Message Broker Software
Best for General-purpose open-source messaging Managed cloud pub/sub
Pricing model Free Free plan + paid
Starting price Free plan —
Free plan ✓ ✓
Free trial — —
Deployment Cloud, Self-hosted Cloud
Platforms Windows, macOS, Linux Web
Support Community, Docs, Email · 24/7 Tickets, Community, Docs · 24/7
Built for Small business, Mid-market, Enterprise Small business, Mid-market, Enterprise
Features RabbitMQ 1/1 · Google Cloud Pub/Sub 1/1
Dead-letter queues ✓ ✓
Specs
Deployment model Hybrid Cloud
Delivery guarantees Configurable Configurable
Ordering guarantees Per_queue Not checked yet
Maximum message size 16 MB (best) 10 MB
Supported protocols AMQP 0-9-1, AMQP 1.0, MQTT, STOMP, RabbitMQ Streams, HTTP, WebSocket REST, gRPC
Our review
Pros
  • Supports queues, exchanges, routing, acknowledgements, and dead-lettering
  • Offers quorum queues, federation, shovels, and RabbitMQ Streams
  • Supports AMQP, MQTT, STOMP, HTTP, WebSocket, and multiple deployments
  • Exactly-once delivery, ordering keys, replay, and dead-letter topics
  • Pull and push subscriptions with message filtering
  • Integrations with BigQuery, Cloud Storage, Dataflow, and more
Cons
  • Commercial Tanzu RabbitMQ support and enterprise features are separate
  • The documented default message-size limit is 16 MB
  • Ordering guarantees apply per queue
  • Paid standard throughput starts at $40 per TiB monthly
  • Storage, transfer, import, export, and transformation charges can also apply
  • Cloud deployment may not suit teams seeking a self-managed broker
Our verdict

RabbitMQ is an open-source messaging and streaming broker for distributed applications, microservices, real-time data systems, and IoT workloads. It is suited to teams that need general-purpose message queues, exchanges, routing,…

Read the review →

Google Cloud Pub/Sub is a fully managed real-time messaging service for exchanging messages between independent applications. It fits teams building event-driven applications, streaming pipelines, and distributed systems that need publish…

Read the review →
  1. RabbitMQMessage Broker Software 9.4Free plan
  2. Google Cloud Pub/SubMessage Broker Software 9.1Free plan

Strengths and trade-offs

  • RabbitMQ — where it wins

    • Supports queues, exchanges, routing, acknowledgements, and dead-lettering
    • Offers quorum queues, federation, shovels, and RabbitMQ Streams
    • Supports AMQP, MQTT, STOMP, HTTP, WebSocket, and multiple deployments

    Where it doesn't

    • Commercial Tanzu RabbitMQ support and enterprise features are separate
    • The documented default message-size limit is 16 MB
    • Ordering guarantees apply per queue

  • Google Cloud Pub/Sub — where it wins

    • Exactly-once delivery, ordering keys, replay, and dead-letter topics
    • Pull and push subscriptions with message filtering
    • Integrations with BigQuery, Cloud Storage, Dataflow, and more

    Where it doesn't

    • Paid standard throughput starts at $40 per TiB monthly
    • Storage, transfer, import, export, and transformation charges can also apply
    • Cloud deployment may not suit teams seeking a self-managed broker

More comparisons

All message broker software comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update