Pretty Fish

Browser-based Mermaid diagram editor with live preview, multi-page projects, and offline support.

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Pretty Fish is a browser-based workspace for writing and arranging Mermaid diagrams, with a live preview, an infinite canvas for organizing multiple diagrams into projects, and export to SVG, PNG, or Mermaid source. It installs as an offline-capable PWA, aimed at developers and technical writers who diagram regularly in Mermaid.

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Problem & pain-point mapping
Who we surface it to (audience fit)
What it's a strong alternative to
Trust & credibility signals

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