head to head · open source
Mermaid vs deck.gl
Mermaid has 90,293 GitHub stars, 9,266 forks, 1,781 open issues and last shipped 3 days ago. deck.gl has 14,597 stars, 2,267 forks, 532 open issues and last shipped yesterday. Mermaid leads on adoption by 519% (90,293 vs 14,597 stars). Mermaid is written in TypeScript under MIT; deck.gl is written in TypeScript under MIT. Mermaid has attracted 10% as many forks as stars, deck.gl 16%. deck.gl was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (javascript), so they are genuine substitutes rather than adjacent tools.
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 | deck.gl | |
|---|---|---|
| GitHub stars | ★ 90K | ★ 15K |
| License | MIT | MIT |
| Written in | TypeScript | TypeScript |
| Last push | 2026-09-15 | 2026-09-17 |
| Forks | ⑂ 9.3K | ⑂ 2.3K |
| 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 deck.gl if
- You want the deck.gl feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and deck.gl 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 deck.gl
deck.gl is an MIT licensed, WebGL2 and WebGPU powered visualization framework that renders large scale geospatial and data driven layers in the browser, built for JavaScript, TypeScript and Python developers who need high performance maps and custom visualizations without writing their own GPU rendering code.
read the full deck.gl overview →
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Frequently asked questions
Is Mermaid or deck.gl more popular?
Mermaid has 90,293 GitHub stars and deck.gl has 14,597. Mermaid has the larger community by that measure.
Are Mermaid and deck.gl free?
Both are open source. Mermaid is licensed under MIT and deck.gl under MIT. Neither carries a licence fee.
What is the difference between Mermaid and deck.gl?
Mermaid is written in TypeScript and deck.gl 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 deck.gl?
Choose Mermaid if you want the larger community (90,293 stars) or its MIT licence terms. Choose deck.gl if its feature set, stack or MIT licence fits better. Both are self-hostable.