OpenFlowKit is an open-source diagram engine designed specifically for builders who need to create visual representations of complex systems. It provides a flexible canvas for designing architecture diagrams, flowcharts, and other technical visualizations without the constraints of traditional design tools.

The tool offers fully customizable nodes, edges, and themes powered by React Flow, allowing users to create diagrams that match their brand identity. It features first-class support for Mermaid.js and a type-safe DSL for diagram-as-code workflows, enabling developers to define architecture in code and let the engine handle layout automatically. The AI assistant (Flowpilot AI) allows users to chat with their diagrams and make modifications through natural language commands. Additional capabilities include local and private operation with no cloud saves or tracking, offline readiness, and comprehensive export options.

OpenFlowKit operates as a local-first application where everything stays on the user's machine, providing full freedom and privacy. The engine supports three native workflows: engineering (diagram-as-code with DSL or Mermaid.js syntax), design (visual layer with Figma integration), and export/share functionality for various output formats.

The primary benefits include eliminating pixel-perfect alignment struggles, preventing documentation drift through code-based diagrams, and avoiding generic enterprise templates. Users can create diagrams that look like art rather than standard documentation, with fully customizable fonts, colors, and shapes.

The tool targets engineers, architects, and product teams who need to create technical diagrams for system architecture, workflows, and documentation. It integrates with existing workflows through code-based diagramming, Figma compatibility, and supports export to SVG, PNG, PDF, and JSON formats for version control and sharing.