Google Cloud Pub/Sub vs Amazon SNS
Compare Google Cloud Pub/Sub vs Amazon SNS for topics, subscriptions and message delivery design. Review the deployment model, migration work and proposed acceptance checks.
Which option fits the workload?
Consider Google Cloud Pub/Sub when the system needs Google Cloud topic and subscription messaging. Consider Amazon SNS when the system needs AWS topic-based notifications and supported SNS destinations. Validate the required configuration and operating responsibilities before comparing costs.
Seven differences that change the shortlist
| Buying question | Google Cloud Pub/Sub | Amazon SNS |
|---|---|---|
| Provider | Google Cloud | AWS |
| Primary abstraction | Topics and subscriptions | Topics and subscriptions to supported destinations |
| Application role | Asynchronous messaging between application components | Publish-subscribe notifications and fan-out |
| Consumer design | Select the Pub/Sub subscription and delivery mode | Select the SNS destination and delivery arrangement |
| Queue integration | Review Pub/Sub retention and subscriber behaviour | Use SQS where the design needs a separate durable queue |
| Failure handling | Configure acknowledgement and redelivery behaviour | Configure endpoint delivery and failure handling |
| Cost exercise | Message traffic, delivery and retained-data scope | Publications, deliveries and connected destination services |
Four worked buying briefs
These are hypothetical scenarios with explicit assumptions. They do not establish equal capabilities, measured usability or a negotiated price.
| Requirement | Proposed exercise | Accept when |
|---|---|---|
| Fan-out | Publish one event for two independent test consumers. | Each intended consumer receives the event under the selected design. |
| Unavailable consumer | Pause one consumer and restore it under the documented configuration. | Recovery behaviour matches the application's retention requirement. |
| Duplicate handling | Replay a representative event to the consumer. | Consumer processing preserves the required business outcome. |
| Failure route | Exercise the configured message-failure path. | The team can identify and handle the failed message. |
Fan-out
Can the team publish one event for two independent test consumers?
Google Cloud Pub/Sub: Using Google Cloud Pub/Sub, publish one event for two independent test consumers.
Amazon SNS: Using Amazon SNS, publish one event for two independent test consumers.
Each intended consumer receives the event under the selected design.
Unavailable consumer
Can the team pause one consumer and restore it under the documented configuration?
Google Cloud Pub/Sub: Using Google Cloud Pub/Sub, pause one consumer and restore it under the documented configuration.
Amazon SNS: Using Amazon SNS, pause one consumer and restore it under the documented configuration.
Recovery behaviour matches the application's retention requirement.
Duplicate handling
Can the team replay a representative event to the consumer?
Google Cloud Pub/Sub: Using Google Cloud Pub/Sub, replay a representative event to the consumer.
Amazon SNS: Using Amazon SNS, replay a representative event to the consumer.
Consumer processing preserves the required business outcome.
Failure route
Can the team exercise the configured message-failure path?
Google Cloud Pub/Sub: Using Google Cloud Pub/Sub, exercise the configured message-failure path.
Amazon SNS: Using Amazon SNS, exercise the configured message-failure path.
The team can identify and handle the failed message.
Architecture and application fit
Pub/Sub and SNS both support topic-based messaging, but matching the word topic does not establish equivalent consumer behaviour. Decide whether the application needs notifications, competing workers, independent subscriptions or a queue behind a subscriber.
SNS is frequently combined with SQS when the consumer needs a durable queue. Include that additional service in the architecture and cost comparison instead of treating SNS alone as the whole worker-delivery design.
Google Cloud Pub/Sub product documentation ↗ · Amazon SNS product information ↗
Cost and migration planning
Define how the application handles retries, duplicates and unavailable consumers. Product configuration and consumer idempotency need to work together; neither service removes the need for application-level failure handling.
A useful trial pauses a consumer, introduces a duplicate message and then recovers the consumer. Check the actual delivery and retention settings for the selected configuration rather than assuming a universal exactly-once outcome.
Questions before you choose
When should I choose Google Cloud Pub/Sub over Amazon SNS?
Consider Google Cloud Pub/Sub when the system needs Google Cloud topic and subscription messaging. Consider Amazon SNS when the system needs AWS topic-based notifications and supported SNS destinations. Validate the required configuration and operating responsibilities before comparing costs.
What should we include in the cost comparison?
Define how the application handles retries, duplicates and unavailable consumers. Product configuration and consumer idempotency need to work together; neither service removes the need for application-level failure handling.
What should we test before a production migration?
A useful trial pauses a consumer, introduces a duplicate message and then recovers the consumer. Check the actual delivery and retention settings for the selected configuration rather than assuming a universal exactly-once outcome.
Turn the comparison into your own evaluation
Use the same criteria and priorities for both products, keep unknowns unassessed and record the plan and evidence behind your ratings.
Build a Google Cloud Pub/Sub vs Amazon SNS scorecard →Keep the assumptions with the figures
Use the date, billing cycle, units and limits with each example. Check current account terms before purchasing. Unverified prices and model costs stay unpriced.
Download the buying examples as JSON ↓Share the comparison
Use these examples when discussing the shortlist with your team.