# StateM — Visual State Machine Simulator & Code Exporter

> StateM is a free, interactive web-based IDE, Monte Carlo simulator, and visual analytics studio for Finite State Machines (FSMs) and state charts.

## Overview & Core Capabilities

- **Visual FSM Editor & Diagrammer**: Design, edit, and visualize complex state machines using JSON Schema or Mermaid.js syntax.
- **Monte Carlo Simulation Engine**: Run 10,000 to 100,000+ automated simulation paths to stress-test workflows.
- **Automated Deadlock & Bottleneck Detection**: Uncover unreachable states, terminal traps, and high-latency funnel bottlenecks before shipping to production.
- **Multi-Language Code Generation & Exporters**: Generate production-ready, type-safe implementation code in 1 click for:
  - **TypeScript (XState v5)**
  - **TypeScript (Pure Object-Oriented Class)**
  - **Python (transitions framework)**
  - **Go (stateless microservices library)**
  - **Rust (Type-safe Enum & Pattern Match)**
  - **Mermaid Diagram**
  - **Raw JSON Schema**
- **Production Presets Included**:
  - E-Commerce Checkout Flow (with Deadlock Demos)
  - Subscription Lifecycle (Free Trial -> Paid -> Churn -> Cancel)
  - OAuth2 Authentication Flow
  - Order Fulfillment Pipeline

## Primary Audience & Use-Cases

- **Software Architects & Engineers**: Model complex backend business logic, payment gateways, and user onboarding pipelines.
- **Frontend Developers**: Model React / Vue application UI states and export directly to XState or pure TypeScript.
- **QA & Reliability Engineers**: Perform Monte Carlo risk analysis to discover hidden deadlock edge-cases in state transitions.

## Key Technical Features

1. **Monte Carlo Heatmaps**: Visual state node heatmap highlighting high-traffic vs under-visited paths.
2. **Step-by-Step Manual Debugger**: Interactive stepper allowing developers to trigger events manually and trace state transitions step-by-step.
3. **Responsive Mobile & Desktop IDE**: Full touch support, pinch-to-zoom, and responsive layout across desktop and mobile devices.

## Useful Links & Export Formats

- Website: https://statem.app
- Exporters: TypeScript, XState v5, Python, Go, Rust, Mermaid, JSON.