head to head · open source
Bruno vs openapi-generator
Bruno has 47,982 GitHub stars, 3,066 forks, 1,831 open issues and last shipped 2 days ago. openapi-generator has 26,844 stars, 7,746 forks, 5,819 open issues and last shipped yesterday. Bruno leads on adoption by 79% (47,982 vs 26,844 stars). Bruno is written in JavaScript under MIT; openapi-generator is written in Java under Apache-2.0. Bruno has attracted 6% as many forks as stars, openapi-generator 29%. openapi-generator was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 4 topic tags (api-client, openapi, openapi3, rest-api), 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
| Bruno | openapi-generator | |
|---|---|---|
| GitHub stars | ★ 48K | ★ 27K |
| License | MIT | Apache-2.0 |
| Written in | JavaScript | Java |
| Last push | 2026-11-01 | 2026-11-02 |
| Forks | ⑂ 3.1K | ⑂ 7.7K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Bruno if
- You weight community size — 48K stars and counting
- You want the MIT license terms
- Your stack matches JavaScript
- You value the larger contributor base for long-term maintenance
pick openapi-generator if
- You want the openapi-generator feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Java
- You evaluated both and openapi-generator fits your workflow better
About Bruno
Bruno Opensource IDE for exploring and testing APIs. English Українська Русский Türkçe Deutsch Français Português (BR) 한국어 বাংলা Español Italiano Română Polski 简体中文 正體中文 العربية 日本語 ქართული Nederlands فارسی Bruno is a new and innovative API client, aimed at revolutionizing the status quo represented by Postman and similar tools out there. Bruno stores your collections directly in a folder on your filesystem. We use a plain text markup language, Bru, to save information about API requests. You can use Git or any version control of your choice to collaborate over your API collections. Bruno is offline only. There…
read the full Bruno overview →
About openapi-generator
OpenAPI Generator Master ( 7.27.0 ): :star::star::star: If you would like to contribute, please refer to guidelines and a list of open tasks. :star::star::star: :bangbang: To migrate from Swagger Codegen to OpenAPI Generator, please refer to the migration guide :bangbang: :notebook with decorative cover: For more information, please refer to the Wiki page and FAQ :notebook with decorative cover: :notebook with decorative cover: The eBook A Beginner's Guide to Code Generation for REST APIs is a good starting point for beginners :notebook with decorative cover: :warning: If the OpenAPI spec, templates or any input…
read the full openapi-generator overview →
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Frequently asked questions
Is Bruno or openapi-generator more popular?
Bruno has 47,982 GitHub stars and openapi-generator has 26,844. Bruno has the larger community by that measure.
Are Bruno and openapi-generator free?
Both are open source. Bruno is licensed under MIT and openapi-generator under Apache-2.0. Neither carries a licence fee.
What is the difference between Bruno and openapi-generator?
Bruno is written in JavaScript and openapi-generator in Java. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Bruno or openapi-generator?
Choose Bruno if you want the larger community (47,982 stars) or its MIT licence terms. Choose openapi-generator if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.