head to head · open source
Hoppscotch vs OpenAPI.NET
Hoppscotch has 80,345 GitHub stars, 6,118 forks, 820 open issues and last shipped 3 days ago. OpenAPI.NET has 1,610 stars, 286 forks, 31 open issues and last shipped 2 days ago. Hoppscotch leads on adoption by 4,890% (80,345 vs 1,610 stars). Hoppscotch is written in TypeScript under MIT; OpenAPI.NET is written in C# under MIT. Hoppscotch has attracted 8% as many forks as stars, OpenAPI.NET 18%. OpenAPI.NET was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (http), 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
| Hoppscotch | OpenAPI.NET | |
|---|---|---|
| GitHub stars | ★ 80K | ★ 1.6K |
| License | MIT | MIT |
| Written in | TypeScript | C# |
| Last push | 2026-09-16 | 2026-09-17 |
| Forks | ⑂ 6.1K | ⑂ 286 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Hoppscotch if
- You weight community size — 80K stars and counting
- You want the MIT license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick OpenAPI.NET if
- You want the OpenAPI.NET feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches C#
- You evaluated both and OpenAPI.NET fits your workflow better
About Hoppscotch
Hoppscotch is an open source API development ecosystem that provides a full featured client for designing, testing, and documenting APIs. It operates as a web based application, desktop app, and CLI tool, supporting offline, on premises, and cloud deployments. Built with TypeScript and licensed under MIT, it serves as a direct open source alternative to proprietary tools like Postman and Insomnia.
read the full Hoppscotch overview →
About OpenAPI.NET
OpenAPI.NET is the Microsoft maintained .NET SDK that provides a shared object model for OpenAPI descriptions, together with readers and writers that convert OpenAPI JSON and YAML documents into and out of that model, and it is aimed at C and .NET developers who build, validate, or transform OpenAPI documents in code.
read the full OpenAPI.NET overview →
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Frequently asked questions
Is Hoppscotch or OpenAPI.NET more popular?
Hoppscotch has 80,345 GitHub stars and OpenAPI.NET has 1,610. Hoppscotch has the larger community by that measure.
Are Hoppscotch and OpenAPI.NET free?
Both are open source. Hoppscotch is licensed under MIT and OpenAPI.NET under MIT. Neither carries a licence fee.
What is the difference between Hoppscotch and OpenAPI.NET?
Hoppscotch is written in TypeScript and OpenAPI.NET 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, Hoppscotch or OpenAPI.NET?
Choose Hoppscotch if you want the larger community (80,345 stars) or its MIT licence terms. Choose OpenAPI.NET if its feature set, stack or MIT licence fits better. Both are self-hostable.