SpecificationsOpen Source✦ Free Tier

Mermaid

Text-to-diagram natively supported by GitHub and Notion

⭐ 87,000 stars● Health 80 — ActiveDev Productivity
Open in Builder →Website ↗GitHub ↗

About

Renders flowcharts, sequence diagrams, ER diagrams, C4 diagrams, and Gantt charts from simple Markdown-style text definitions. Native support in GitHub, GitLab, Notion, and dozens of engineering platforms. With 87k+ GitHub stars, it's the most widely adopted diagramming tool in engineering.

Choose Mermaid when…

  • •You want diagrams embedded in Markdown or docs
  • •Lightweight text-based diagramming fits your workflow
  • •You need flowcharts or sequence diagrams quickly

Builder Slot

How do you define what you're building?Optional for most stacks

Spec writing, API design, architecture diagrams, and contract-first tooling — the upstream layer before code is written

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App Infra
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Other tools in this slot:

Spec KitEraserStructurizrSwagger / OpenAPIRedoclyAsyncAPIStoplightSpeakeasy+3 more

Stack Genome Detection

AIchitect's Genome scanner detects Mermaid in your project via these signals:

npm packages
mermaid@mermaid-js/mermaid-mindmap

Integrates with (1)

Notion AIDocumentation

Notion AI renders Mermaid diagram blocks natively — embed Mermaid code in Notion pages and they render as visual diagrams.

→ Architecture diagrams embedded in living Notion docs — diagrams stay editable as code, render as visuals for stakeholders.

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Often paired with (2)

Spec KitSwimm

Alternatives to consider (2)

Structurizrcompare →Erasercompare →

Pricing

✦ Free tier available

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Mermaid on AIchitect[![Mermaid](https://aichitect.dev/badge/tool/mermaid)](https://aichitect.dev/tool/mermaid)

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