Advanced State Machine Editor

A Finite State Machine Editor is a native macOS app for designing, validating, simulating, and generating code from finite state machines — all in one unified interface.
**DESIGN VISUALLY**
Build state machines with an intuitive table-based editor. Add states with entry and exit actions, define transitions with events, guards, and actions. Assign colours to states and transitions — the diagram renders them instantly using Graphviz. Choose from 4 layout directions (Top→Bottom, Left→Right, Right→Left, Bottom→Top) and customise node shapes, fill colours, and arrow styles.
**VALIDATE RIGOROUSLY**
Every machine is checked against 13 validation rules shown in a comprehensive report with pass/fail marks. Detects: missing initial states, ambiguous transitions, unreachable states, duplicate names, final states with outgoing transitions, states without incoming paths, invalid characters in identifiers, and more. Errors appear inline — no guessing.
**SIMULATE INTERACTIVELY**
Run the simulator to step through your machine.