head to head · open source
Bruno vs microcks
Bruno has 47,022 GitHub stars, 2,888 forks, 1,831 open issues and last shipped yesterday. microcks has 2,044 stars, 367 forks, 58 open issues and last shipped yesterday. Bruno leads on adoption by 2,200% (47,022 vs 2,044 stars). Bruno is written in JavaScript under MIT; microcks is written in Java under Apache-2.0. Bruno has attracted 6% as many forks as stars, microcks 18%. microcks was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (api-testing), 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 | microcks | |
|---|---|---|
| GitHub stars | ★ 47K | ★ 2.0K |
| License | MIT | Apache-2.0 |
| Written in | JavaScript | Java |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 2.9K | ⑂ 367 |
| 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 microcks if
- You want the microcks 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 microcks 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 microcks
Microcks is an open source, cloud native API mocking and testing tool and a Cloud Native Computing Foundation incubating project. It lives in the developer tools and API development ecosystem, where teams need to exercise service contracts before implementations are ready or before changes are trusted. The project turns existing API and microservice assets, including OpenAPI specs, AsyncAPI specs, gRPC protobuf, GraphQL schema, Postman collections, and SoapUI projects, into live mocks for applications, testers, and integration pipelines.
read the full microcks overview →
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Frequently asked questions
Is Bruno or microcks more popular?
Bruno has 47,022 GitHub stars and microcks has 2,044. Bruno has the larger community by that measure.
Are Bruno and microcks free?
Both are open source. Bruno is licensed under MIT and microcks under Apache-2.0. Neither carries a licence fee.
What is the difference between Bruno and microcks?
Bruno is written in JavaScript and microcks 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 microcks?
Choose Bruno if you want the larger community (47,022 stars) or its MIT licence terms. Choose microcks if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.