head to head · open source
Bruno vs oasdiff
Bruno has 47,065 GitHub stars, 2,895 forks, 1,831 open issues and last shipped 2 days ago. oasdiff has 1,371 stars, 107 forks, 50 open issues and last shipped 2 days ago. Bruno leads on adoption by 3,333% (47,065 vs 1,371 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 | ★ 47K | ★ 1.4K |
| License | MIT | Apache-2.0 |
| Written in | JavaScript | Go |
| Last push | 2026-09-18 | 2026-09-18 |
| Forks | ⑂ 2.9K | ⑂ 107 |
| 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 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 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 oasdiff
oasdiff is a Go based, Apache 2.0 command line tool that compares OpenAPI specifications and detects breaking changes, built for API engineers and platform teams who need to know whether a spec edit will break existing API clients before it ships.
read the full oasdiff overview →
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Frequently asked questions
Is Bruno or oasdiff more popular?
Bruno has 47,065 GitHub stars and oasdiff has 1,371. 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 (47,065 stars) or its MIT licence terms. Choose oasdiff if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.