Amazon EventBridge (formerly CloudWatch Events) versus AWS IoT Core

05 Nov 2025

Learn how Amazon EventBridge (formerly CloudWatch Events) differs from AWS IoT Core.

	Amazon EventBridge (formerly CloudWatch Events)	AWS IoT Core
Scaling	not disclosed (default soft limit depends on region; e.g., 10,000 msg/sec in eu-west-1)	not disclosed
Max. message size	256 KB	128 KB
Persistence	archiving is possible	up to 1 hour
Replication	Multi-AZ	Multi-AZ
Order guarantee	no	no
Delivery guarantee	at least once	at least once / at most once
Pricing	per message	per message + connection duration
Protocols	AWS Rest API	MQTT, AWS Rest API
AWS Integrations	Lambda, SQS, SNS, and many more	Lambda, SQS, SNS, and many more
License	AWS only	AWS only
Encryption at rest	yes	no
Encryption in transit	yes	yes

Further reading