head to head · open source
Mermaid vs Deepnote
Mermaid has 90,981 GitHub stars, 9,444 forks, 1,781 open issues and last shipped yesterday. Deepnote has 3,028 stars, 203 forks, 33 open issues and last shipped 2 days ago. Mermaid leads on adoption by 2,905% (90,981 vs 3,028 stars). Mermaid is written in TypeScript under MIT; Deepnote is written in TypeScript under Apache-2.0. Mermaid has attracted 10% as many forks as stars, Deepnote 7%. 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 | Deepnote | |
|---|---|---|
| GitHub stars | ★ 91K | ★ 3.0K |
| License | MIT | Apache-2.0 |
| Written in | TypeScript | TypeScript |
| Last push | 2026-11-02 | 2026-11-01 |
| Forks | ⑂ 9.4K | ⑂ 203 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Mermaid if
- You weight community size — 91K stars and counting
- You want the MIT license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick Deepnote if
- You want the Deepnote feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches TypeScript
- You evaluated both and Deepnote fits your workflow better
About Mermaid
Mermaid Generate diagrams from Markdown like text. Live Editor! 📖 Documentation 🚀 Getting Started 🌐 CDN 🙌 Join Us 简体中文 Try Live Editor previews of future releases: Develop Next :trophy: Mermaid was nominated and won the JS Open Source Awards (2019) in the category "The most exciting use of technology"!!! Thanks to all involved, people committing pull requests, people answering questions! 🙏 Table of content Expand contents About Examples Release Related projects Contributors Security and safe diagrams Reporting vulnerabilities Appreciation About Mermaid is a JavaScript based diagramming and charting tool…
read the full Mermaid overview →
About Deepnote
Website • Docs • Changelog • X • Examples • Community Deepnote is a data notebook for the AI era Deepnote is used by 500,000+ data professionals at companies like Estée Lauder, SoundCloud, Statsig, Gusto, and beyond. Get started with Deepnote in seconds: Then open your .deepnote file in VS Code, Cursor, or Windsurf! What is Deepnote? Deepnote is a drop in replacement for Jupyter. It uses the Deepnote kernel, which is more powerful but still backwards compatible, so you can seamlessly move between both, but it adds an AI agent, sleek UI, new block types, and native data integrations. Deepnote Open Source offers…
read the full Deepnote overview →
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Frequently asked questions
Is Mermaid or Deepnote more popular?
Mermaid has 90,981 GitHub stars and Deepnote has 3,028. Mermaid has the larger community by that measure.
Are Mermaid and Deepnote free?
Both are open source. Mermaid is licensed under MIT and Deepnote under Apache-2.0. Neither carries a licence fee.
What is the difference between Mermaid and Deepnote?
Mermaid is written in TypeScript and Deepnote in TypeScript. 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 Deepnote?
Choose Mermaid if you want the larger community (90,981 stars) or its MIT licence terms. Choose Deepnote if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.