Mermaid is the text-based diagram syntax a lot of developers already use in README files and docs — you write a few lines describing boxes and arrows, and it renders a flowchart. Mermaid Viewer takes that syntax and wraps it in an actual editor: real-time preview as you type, an AI mode that generates the diagram from a plain-English description instead of hand-written syntax, and one-click export to SVG, PNG, PDF or JPG for dropping into docs or slides. It's built for developers, architects and technical teams making governance workflows, timelines and design diagrams, with version history, annotations, shareable editor links, and syntax error detection. Data is stored locally for privacy, and there's a Docker-based enterprise option for self-hosting. Pricing: free for 3 diagrams, Starter at $69.99/year for 30 diagrams, and Pro at $119.99/year for unlimited diagrams and AI conversations.
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