head to head · open source
Mermaid vs reaviz
Mermaid has 90,299 GitHub stars, 9,266 forks, 1,781 open issues and last shipped 4 days ago. reaviz has 1,250 stars, 124 forks, 32 open issues and last shipped 1 months ago. Mermaid leads on adoption by 7,124% (90,299 vs 1,250 stars). Mermaid is written in TypeScript under MIT; reaviz is written in TypeScript under Apache-2.0. Mermaid has attracted 10% as many forks as stars, reaviz 10%. 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 | reaviz | |
|---|---|---|
| GitHub stars | ★ 90K | ★ 1.3K |
| License | MIT | Apache-2.0 |
| Written in | TypeScript | TypeScript |
| Last push | 2026-09-15 | 2026-08-10 |
| Forks | ⑂ 9.3K | ⑂ 124 |
| 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 reaviz if
- You want the reaviz 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 reaviz 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 reaviz
REAVIZ is an Apache 2.0 chart component library for React, maintained by @goodcodeus, that renders charts natively in React while using D3js under the hood for calculations — made for TypeScript developers who need customizable charts inside an existing React application.
read the full reaviz overview →
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Frequently asked questions
Is Mermaid or reaviz more popular?
Mermaid has 90,299 GitHub stars and reaviz has 1,250. Mermaid has the larger community by that measure.
Are Mermaid and reaviz free?
Both are open source. Mermaid is licensed under MIT and reaviz under Apache-2.0. Neither carries a licence fee.
What is the difference between Mermaid and reaviz?
Mermaid is written in TypeScript and reaviz 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 reaviz?
Choose Mermaid if you want the larger community (90,299 stars) or its MIT licence terms. Choose reaviz if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.