head to head · open source
Bruno vs spectral
Bruno has 47,992 GitHub stars, 3,068 forks, 1,831 open issues and last shipped yesterday. spectral has 3,247 stars, 305 forks, 222 open issues and last shipped 4 days ago. Bruno leads on adoption by 1,378% (47,992 vs 3,247 stars). Bruno is written in JavaScript under MIT; spectral is written in TypeScript under Apache-2.0. Bruno has attracted 6% as many forks as stars, spectral 9%. Bruno 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 | spectral | |
|---|---|---|
| GitHub stars | ★ 48K | ★ 3.2K |
| License | MIT | Apache-2.0 |
| Written in | JavaScript | TypeScript |
| Last push | 2026-11-02 | 2026-10-30 |
| Forks | ⑂ 3.1K | ⑂ 305 |
| 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 spectral if
- You want the spectral feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches TypeScript
- You evaluated both and spectral 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 spectral
[ ][stoplight forest] Custom Rulesets : Create custom rules to lint JSON or YAML objects Ready to use Rulesets : Validate and lint OpenAPI v2, v3.0, v3.1 & v3.2 , AsyncAPI , and Arazzo v1 Documents API Style Guides : Automated API Style Guides using rulesets improve consistency across all your APIs Ready to use Functions : Built in set of functions to help create custom rules. Functions include pattern checks, parameter checks, alphabetical ordering, a specified number of characters, provided keys are present in an object, etc. Custom Functions : Create custom functions for advanced use cases Overview 🧰…
read the full spectral overview →
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Frequently asked questions
Is Bruno or spectral more popular?
Bruno has 47,992 GitHub stars and spectral has 3,247. Bruno has the larger community by that measure.
Are Bruno and spectral free?
Both are open source. Bruno is licensed under MIT and spectral under Apache-2.0. Neither carries a licence fee.
What is the difference between Bruno and spectral?
Bruno is written in JavaScript and spectral in TypeScript. 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 spectral?
Choose Bruno if you want the larger community (47,992 stars) or its MIT licence terms. Choose spectral if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.