head to head · open source
Bruno vs oasdiff
Bruno has 48,049 GitHub stars, 3,075 forks, 1,831 open issues and last shipped yesterday. oasdiff has 1,449 stars, 113 forks, 50 open issues and last shipped yesterday. Bruno leads on adoption by 3,216% (48,049 vs 1,449 stars). Bruno is written in JavaScript under MIT; oasdiff is written in Go under Apache-2.0. Bruno has attracted 6% as many forks as stars, oasdiff 8%. oasdiff was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (openapi, openapi3), 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 | oasdiff | |
|---|---|---|
| GitHub stars | ★ 48K | ★ 1.4K |
| License | MIT | Apache-2.0 |
| Written in | JavaScript | Go |
| Last push | 2026-11-03 | 2026-11-03 |
| Forks | ⑂ 3.1K | ⑂ 113 |
| 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 oasdiff if
- You want the oasdiff feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Go
- You evaluated both and oasdiff 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 oasdiff
Command line tool to compare and detect breaking changes in OpenAPI specs. Run it locally, in CI via the GitHub Action, or use the hosted PR review workflow at oasdiff.com to approve or reject each change with a CI commit status. Get started in 30 seconds No install needed — try it with Docker against two sample specs: That prints a human readable changelog of the changes that can affect API consumers, breaking and non breaking. Swap changelog for breaking to see only the changes that break existing API clients, or diff for the full machine readable diff of the API definition, including documentation only edits…
read the full oasdiff overview →
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Frequently asked questions
Is Bruno or oasdiff more popular?
Bruno has 48,049 GitHub stars and oasdiff has 1,449. Bruno has the larger community by that measure.
Are Bruno and oasdiff free?
Both are open source. Bruno is licensed under MIT and oasdiff under Apache-2.0. Neither carries a licence fee.
What is the difference between Bruno and oasdiff?
Bruno is written in JavaScript and oasdiff in Go. 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 oasdiff?
Choose Bruno if you want the larger community (48,049 stars) or its MIT licence terms. Choose oasdiff if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.