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OpenFlowKit review

Free#1 of 32 in AI Diagram Generators

A flexible free diagramming workspace for technical teams that prefer editable, portable outputs.

9.4/10Editor score
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OpenFlowKit9.4 Visit OpenFlowKit

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

OpenFlowKit is a local-first diagramming workspace for developers and technical teams. It turns prompts, source code, Mermaid, SQL, OpenAPI, Terraform, Kubernetes, and other structured inputs into editable diagrams. The browser-based editor combines visual editing with diagram-as-code workflows, automatic graph layout, collaboration rooms, and exports across image, vector, text, design, and video formats. It is open-source, MIT-licensed, requires no account, and can be self-hosted.

Pricing is straightforward: the published Free Forever plan costs $0 USD and includes unlimited diagrams and projects, local saving, one-click auto-layout, Mermaid.js support, and AI diagram generation with your own key. That makes OpenFlowKit a strong fit for teams that want to avoid a paid diagramming subscription while retaining control over storage and AI provider access. The bring-your-own-key model also connects with OpenAI, Anthropic Claude, Google Gemini, Groq, Mistral, NVIDIA NIM, Cerebras, OpenRouter, and Ollama. Users who want to connect technical workflows can use MCP server support with Claude Desktop, Cursor, and Windsurf.

Its standout capability is the combination of structured imports, editable DSLs, and bidirectional canvas synchronization. A diagram can remain connected to Mermaid or OpenFlow representations rather than becoming a static visual, while ELK.js provides automatic graph layout. Exports include PNG, JPG, SVG, JSON, Mermaid, PlantUML, Figma editable export, WebM, and MP4. Real-time collaboration rooms add presence and connection status, although WebRTC collaboration is opt-in beta and off by default. OpenFlowKit suits developers and technical teams prioritizing flexibility, local-first storage, and broad interoperability; teams wanting a fully managed collaboration service or built-in AI access without managing provider keys should choose another option.

OpenFlowKit pros and cons

  • Where it wins
    • Generates editable diagrams from prompts, code, SQL, and infrastructure sources
    • Supports Mermaid and OpenFlow DSL editing with canvas synchronization
    • Exports to PNG, SVG, JSON, Mermaid, PlantUML, Figma, and video
  • Where it doesn't
    • AI generation requires users to provide their own provider key
    • WebRTC collaboration is opt-in beta and off by default
    • Self-hosting requires users to deploy the static application themselves

OpenFlowKit fact sheet, pricing and score →

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