head to head · open source
Mermaid vs openchatbi
Mermaid has 90,293 GitHub stars, 9,266 forks, 1,781 open issues and last shipped 3 days ago. openchatbi has 646 stars, 91 forks, 2 open issues and last shipped 6 days ago. Mermaid leads on adoption by 13,877% (90,293 vs 646 stars). Mermaid is written in TypeScript under MIT; openchatbi is written in Python under MIT. Mermaid has attracted 10% as many forks as stars, openchatbi 14%. Mermaid was the more recently maintained of the two, and both are self-hostable with no licence fee.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| Mermaid | openchatbi | |
|---|---|---|
| GitHub stars | ★ 90K | ★ 646 |
| License | MIT | MIT |
| Written in | TypeScript | Python |
| Last push | 2026-09-15 | 2026-09-12 |
| Forks | ⑂ 9.3K | ⑂ 91 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Mermaid if
- You weight community size — 90K stars and counting
- You want the MIT license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick openchatbi if
- You want the openchatbi feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Python
- You evaluated both and openchatbi fits your workflow better
About Mermaid
Mermaid is a JavaScript based diagramming tool that renders diagrams from Markdown like text definitions. It lives in the JavaScript/TypeScript ecosystem and operates both in the browser and in Node.js environments. The project’s core purpose is to eliminate the gap between software development and documentation by letting developers write diagrams alongside code, avoiding the rot and overhead of manual diagram maintenance.
read the full Mermaid overview →
About openchatbi
OpenChatBI is an open source, MIT licensed chat based business intelligence tool that lets analysts and data teams query, analyze, and visualize warehouse data through natural language conversation, built in Python on the LangGraph and LangChain ecosystem.
read the full openchatbi overview →
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Frequently asked questions
Is Mermaid or openchatbi more popular?
Mermaid has 90,293 GitHub stars and openchatbi has 646. Mermaid has the larger community by that measure.
Are Mermaid and openchatbi free?
Both are open source. Mermaid is licensed under MIT and openchatbi under MIT. Neither carries a licence fee.
What is the difference between Mermaid and openchatbi?
Mermaid is written in TypeScript and openchatbi in Python. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Mermaid or openchatbi?
Choose Mermaid if you want the larger community (90,293 stars) or its MIT licence terms. Choose openchatbi if its feature set, stack or MIT licence fits better. Both are self-hostable.