Amazon SNS FIFO versus Amazon EventBridge (formerly CloudWatch Events)

05 Nov 2025

Learn how Amazon SNS FIFO differs from Amazon EventBridge (formerly CloudWatch Events).

	Amazon SNS FIFO	Amazon EventBridge (formerly CloudWatch Events)
Scaling	3000 msg/sec (batch write) or 10 MB per second	not disclosed (default soft limit depends on region; e.g., 10,000 msg/sec in eu-west-1)
Max. message size	256 KB	256 KB
Persistence	no	archiving is possible
Replication	Multi-AZ	Multi-AZ
Order guarantee	yes	no
Delivery guarantee	exactly-once possible	at least once
Pricing	per message	per message
Protocols	AWS Rest API	AWS Rest API
AWS Integrations	SQS FIFO	Lambda, SQS, SNS, and many more
License	AWS only	AWS only
Encryption at rest	yes	yes
Encryption in transit	yes	yes

Further reading