Behavioral UML Requirements
UML Use Case Diagram Maker
Specify user roles, system boundaries, functional requirements, and actor-to-use-case interactions.
Map User Scenarios Fast
Drag actors and use cases directly onto the SVG canvas with instant PDF/PNG export.
What is a Use Case Diagram?
A Use Case Diagram captures system requirements by visualizing the interactions between external actors (human users or other software systems) and the system itself to achieve specific goals.
Core Use Case Elements
Actor
Stick figure representing human roles, hardware devices, or external APIs initiating interactions.
Use Case
Horizontal ellipse containing a verb-noun action describing a goal (e.g. "Log In", "Checkout").
System Boundary
Dashed rectangle enclosing internal use cases to define system scope.
Include vs Extend Stereotypes
- <<include>>: Represents mandatory sub-tasks that are always executed as part of the base use case (e.g. "Log In" <<include>> "Verify Credentials").
- <<extend>>: Represents optional behavior triggered only under certain conditions (e.g. "Log In" <<extend>> "Prompt MFA").