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Amazon Simple Workflow (SWF) vs AWS Step Functions vs Amazon SQS

Service	Amazon SWF	AWS Step Functions	Amazon SQS
Type of service	Workflow service	Workflow service	Message queue service
Purpose	Coordinate the coordination of distributed application components	Build and run serverless applications	Send, store, and receive messages between distributed application components
Features	Provides a task-oriented API and tracks the state of all tasks	Provides a visual workflow editor and state management for serverless applications	Allows for decoupling of application components and load balancing of messages
Scale	Can handle thousands of tasks per workflow	Can handle millions of state transitions per month	Can handle millions of requests per second
Monitoring	Provides real-time and historical monitoring of workflows and tasks	Provides real-time monitoring of state transitions	Provides real-time monitoring of queues and messages
Durability	Stores workflow and task state in a durable manner	Stores state in a durable manner	Stores messages in a durable manner
Integration	Integrates with other AWS services such as SNS and Lambda	Integrates with other AWS services such as Lambda and DynamoDB	Integrates with other AWS services such as SNS and Lambda
Pricing	Pay-per-use model based on the number of workflow and task state transitions	Pay-per-use model based on the number of state transitions	Pay-per-use model based on the number of requests and data transfer
Use Cases	Coordinating long-running tasks and processes	Building and running complex, multi-step applications	Decoupling and load balancing of application components and services