head to head · open source
Mermaid vs FastReport
Mermaid has 90,293 GitHub stars, 9,266 forks, 1,781 open issues and last shipped 3 days ago. FastReport has 3,086 stars, 679 forks, 24 open issues and last shipped 7 days ago. Mermaid leads on adoption by 2,826% (90,293 vs 3,086 stars). Mermaid is written in TypeScript under MIT; FastReport is written in C# under MIT. Mermaid has attracted 10% as many forks as stars, FastReport 22%. 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.
← all 8884 open source comparisons
Side by side
| Mermaid | FastReport | |
|---|---|---|
| GitHub stars | ★ 90K | ★ 3.1K |
| License | MIT | MIT |
| Written in | TypeScript | C# |
| Last push | 2026-09-15 | 2026-09-11 |
| Forks | ⑂ 9.3K | ⑂ 679 |
| 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 FastReport if
- You want the FastReport feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches C#
- You evaluated both and FastReport 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 FastReport
FastReport is free open source reporting tool for .NET 6, .NET Core, and .NET Framework. It lives in .NET ecosystem, written in C , licensed under MIT. Project targets Data & Analytics and Business Intelligence & Reporting use.
read the full FastReport overview →
More in Data & Analytics
Related comparisons
More Business Intelligence & Reporting projects
Compare either of these against the rest of the Business Intelligence & Reporting field.
Frequently asked questions
Is Mermaid or FastReport more popular?
Mermaid has 90,293 GitHub stars and FastReport has 3,086. Mermaid has the larger community by that measure.
Are Mermaid and FastReport free?
Both are open source. Mermaid is licensed under MIT and FastReport under MIT. Neither carries a licence fee.
What is the difference between Mermaid and FastReport?
Mermaid is written in TypeScript and FastReport in C#. 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 FastReport?
Choose Mermaid if you want the larger community (90,293 stars) or its MIT licence terms. Choose FastReport if its feature set, stack or MIT licence fits better. Both are self-hostable.