head to head · open source
Hoppscotch vs OpenAPI.NET
Hoppscotch has 80,724 GitHub stars, 6,225 forks, 820 open issues and last shipped 3 days ago. OpenAPI.NET has 1,616 stars, 291 forks, 31 open issues and last shipped 6 days ago. Hoppscotch leads on adoption by 4,895% (80,724 vs 1,616 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%. Hoppscotch 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 | ★ 81K | ★ 1.6K |
| License | MIT | MIT |
| Written in | TypeScript | C# |
| Last push | 2026-10-31 | 2026-10-28 |
| Forks | ⑂ 6.2K | ⑂ 291 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Hoppscotch if
- You weight community size — 81K 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 Open Source API Development Ecosystem Built with ❤︎ by contributors We highly recommend you take a look at the Hoppscotch Documentation to learn more about the app. Support Features ❤️ Lightweight: Crafted with minimalistic UI design. ⚡️ Fast: Send requests and get responses in real time. 🗄️ HTTP Methods: Request methods define the type of action you are requesting to be performed. GET Requests retrieve resource information POST The server creates a new entry in a database PUT Updates an existing resource PATCH Very similar to PUT but makes a partial update on a resource DELETE Deletes resource or…
read the full Hoppscotch overview →
About OpenAPI.NET
OpenAPI.NET The OpenAPI.NET SDK contains a useful object model for OpenAPI documents in .NET along with common serializers to extract raw OpenAPI JSON and YAML documents from the model. See more information on the OpenAPI specification and its history here: OpenAPI Initiative Project Objectives: Provide a single shared object model in .NET for OpenAPI descriptions. Include the most primitive Reader for ingesting OpenAPI JSON and YAML documents in both V2 and V3 formats. Provide OpenAPI description writers for both V2 and V3 specification formats. Enable developers to create Readers that translate different data…
read the full OpenAPI.NET overview →
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Frequently asked questions
Is Hoppscotch or OpenAPI.NET more popular?
Hoppscotch has 80,724 GitHub stars and OpenAPI.NET has 1,616. 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 (80,724 stars) or its MIT licence terms. Choose OpenAPI.NET if its feature set, stack or MIT licence fits better. Both are self-hostable.