OpenCharts vs Mermaid
How OpenCharts compares to Mermaid — text-based diagramming syntax (Mermaid.js).
OpenCharts is a visual, AI-native alternative to Mermaid that lets you generate, edit, and export flowcharts without writing diagram code. Mermaid is excellent for diagrams in Markdown and code repos; OpenCharts is the right pick when you need an interactive editor, real-time collaboration, AI extraction from documents, and exports to PNG/SVG/PDF/PPTX — with a public MCP server for AI agents.
Choose OpenCharts when…
- You want a visual, drag-and-drop editor instead of writing code.
- You need AI to turn a PDF, prompt, or note into an editable diagram.
- Your team wants multiplayer collaboration on diagrams.
- You need polished exports to PPTX, DOCX, PNG, and PDF.
Choose Mermaid when…
- You want diagrams that live as text inside Markdown files (GitHub, GitLab, Notion).
- Your workflow is code-first and you want diagrams version-controlled like source.
- You don't need an interactive canvas — text-defined diagrams are sufficient.
Feature comparison
Pricing snapshot
OpenCharts is free forever; paid tiers raise AI credit limits. Mermaid is open-source and free; mermaid-cli and the Mermaid Live Editor are free; Mermaid Chart (the commercial product) starts around $7/user/month.
Migrating from Mermaid
Paste your Mermaid syntax into OpenCharts AI Chat (Theo can parse it) and ask for a visual flowchart. The result is a fully editable canvas you can export as PNG, SVG, or PPTX. Going the other way, you can describe a flowchart in plain English in OpenCharts and copy the structure as a Mermaid snippet.
Frequently asked questions
Is OpenCharts a Mermaid alternative?
Yes — particularly if you prefer a visual editor over writing diagram code. Mermaid remains a great choice for embedding diagrams in Markdown documentation. The two are complementary.
Can I import Mermaid syntax into OpenCharts?
Yes. Paste your Mermaid code into Theo (the AI Chat) and ask for a visual flowchart. Theo parses the structure and builds an editable canvas.
Can I export OpenCharts diagrams as Mermaid syntax?
Yes. Ask Theo to convert any flowchart into Mermaid syntax. The output is a copy-paste-ready code block you can drop into Markdown.
Does OpenCharts have a CLI?
Today the primary programmatic interface is the public MCP server (Model Context Protocol). It exposes 19 tools that any MCP-compatible client (Warp, Claude Desktop, Cursor, VS Code, Windsurf) can call. A standalone REST/CLI is on the roadmap.
Is OpenCharts open-source?
OpenCharts is not open-source. The MCP server is publicly documented and free to use. Mermaid is open-source under the MIT license.
Try OpenCharts free
No credit card required. Free real-time collaboration, AI flowchart generation, and full export on every plan.