head to head · open source
Mermaid vs FastReport
Mermaid has 90,981 GitHub stars, 9,444 forks, 1,781 open issues and last shipped yesterday. FastReport has 3,104 stars, 683 forks, 24 open issues and last shipped 5 days ago. Mermaid leads on adoption by 2,831% (90,981 vs 3,104 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.
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Side by side
| Mermaid | FastReport | |
|---|---|---|
| GitHub stars | ★ 91K | ★ 3.1K |
| License | MIT | MIT |
| Written in | TypeScript | C# |
| Last push | 2026-11-02 | 2026-10-29 |
| Forks | ⑂ 9.4K | ⑂ 683 |
| 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 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 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 FastReport
What is FastReport? FastReport provides free open source report generator for .NET 6/.NET Core/.NET Framework. You can use the FastReport Open Source in MVC, Web API, console applications. Features FastReport is written in C and it is compatible with .NET Standard 2.0 and higher. Extendable FastReport architecture allows creating your own objects, export filters, wizards and DB engines. Report Objects FastReport is a band oriented report generator. There are 13 types of bands available: Report Title, Report Summary, Page Header, Page Footer, Column Header, Column Footer, Data Header, Data, Data Footer, Group…
read the full FastReport overview →
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Frequently asked questions
Is Mermaid or FastReport more popular?
Mermaid has 90,981 GitHub stars and FastReport has 3,104. 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 (90,981 stars) or its MIT licence terms. Choose FastReport if its feature set, stack or MIT licence fits better. Both are self-hostable.