head to head · open source
Bruno vs openapi-generator
Bruno has 47,022 GitHub stars, 2,888 forks, 1,831 open issues and last shipped yesterday. openapi-generator has 26,745 stars, 7,674 forks, 5,751 open issues and last shipped yesterday. Bruno leads on adoption by 76% (47,022 vs 26,745 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 | ★ 47K | ★ 27K |
| License | MIT | Apache-2.0 |
| Written in | JavaScript | Java |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 2.9K | ⑂ 7.7K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Bruno if
- You weight community size — 47K 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 is a lightweight, open source API client and IDE for exploring and testing APIs, built for developers and teams who want their request collections stored as plain text in a folder on their own filesystem rather than in a vendor's cloud.
read the full Bruno overview →
About openapi-generator
OpenAPI Generator is an Apache 2.0 licensed Java tool that generates API client libraries, server stubs, documentation, and configuration automatically from an OpenAPI Specification, and it is built for development teams that keep a machine readable API description and want generated code to stay in step with it.
read the full openapi-generator overview →
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Frequently asked questions
Is Bruno or openapi-generator more popular?
Bruno has 47,022 GitHub stars and openapi-generator has 26,745. 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 (47,022 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.