Stately.ai

stately.ai

Visual software modeling platform that lets teams design application and business logic as state machines and statecharts.

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Overview

Stately is a visual software modeling platform that lets teams design application and business logic as state machines and statecharts. It combines a drag-and-drop editor with AI-powered code generation, allowing both technical and non-technical team members to collaborate on complex workflows without silos.

The platform integrates with XState, an open-source JavaScript library for managing state, and provides bidirectional synchronization between visual diagrams and code. You can generate React apps, run simulations, create tests automatically, and export to JavaScript or TypeScript—all while keeping diagrams as living documentation that evolves with your product.

Stately serves as a single source of truth for logic across frontend, backend, and wherever JavaScript runs, with support for frameworks like React, Vue, and Svelte.

Key features

  • Visual drag-and-drop editor
  • AI-powered state machine generation
  • Bidirectional code-diagram sync
  • XState integration
  • Auto-generated React apps
  • Automatic test generation
  • VS Code extension
  • GitHub sync
  • Sequence diagrams for actor communication
  • Version history and living documentation
Pros
  • No-code visual design accessible to non-technical users
  • AI assists at every phase of design and development
  • Executable diagrams with XState—no vendor lock-in
  • Bidirectional updates between code and visualization
  • Automatic test generation keeps coverage robust
  • Community sharing and feedback features
  • Works with existing Redux and Zustand codebases
Cons
  • Free plan limited to 3 AI generations per month
  • Professional plan at $33–$39/month for individual use
  • Team plan requires minimum commitment for collaboration
  • Learning curve for state machines and statecharts concepts
Use this if
You need to design complex state machines visually, collaborate across teams on workflow logic, or want AI assistance generating and refining state-based application behavior.
Skip this if
You prefer purely code-based state management without visual modeling, or your project doesn't involve complex stateful logic.

Best for

Teams building complex application logicFrontend and backend state managementCollaborative workflow designRapid prototyping without codeTest-driven developmentCross-functional teams

Alternatives

XState (open-source library only, no visual editor)Miro or Lucidchart (general diagramming, not state-machine-specific)Redux or Zustand (code-only state management)Temporal (workflow orchestration for backend)

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