head to head · open source
Bruno vs zod-to-openapi
Bruno has 47,992 GitHub stars, 3,068 forks, 1,831 open issues and last shipped yesterday. zod-to-openapi has 1,635 stars, 107 forks, 39 open issues and last shipped 1 months ago. Bruno leads on adoption by 2,835% (47,992 vs 1,635 stars). Bruno is written in JavaScript under MIT; zod-to-openapi is written in TypeScript under MIT. Bruno has attracted 6% as many forks as stars, zod-to-openapi 7%. 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 | zod-to-openapi | |
|---|---|---|
| GitHub stars | ★ 48K | ★ 1.6K |
| License | MIT | MIT |
| Written in | JavaScript | TypeScript |
| Last push | 2026-11-02 | 2026-10-02 |
| Forks | ⑂ 3.1K | ⑂ 107 |
| 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 zod-to-openapi if
- You want the zod-to-openapi feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and zod-to-openapi 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 zod-to-openapi
Zod to OpenAPI [!IMPORTANT] For Zod v3 support, please use the v7.3.4 version. However keep in mind that we do not intend to actively support that version going forward Install with: npm install @asteasolutions/zod to openapi@7.3.4 A library that uses zod schemas to generate an Open API Swagger documentation. 1. Purpose and quick example 2. Usage 1. Installation 2. The openapi method 3. The Registry 4. The Generator 5. Defining schemas 6. Defining routes & webhooks 7. Defining custom components 8. A full example 9. Adding it as part of your build 10. Using schemas vs a registry 11. Generation options 3. Zod…
read the full zod-to-openapi overview →
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Frequently asked questions
Is Bruno or zod-to-openapi more popular?
Bruno has 47,992 GitHub stars and zod-to-openapi has 1,635. Bruno has the larger community by that measure.
Are Bruno and zod-to-openapi free?
Both are open source. Bruno is licensed under MIT and zod-to-openapi under MIT. Neither carries a licence fee.
What is the difference between Bruno and zod-to-openapi?
Bruno is written in JavaScript and zod-to-openapi 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 zod-to-openapi?
Choose Bruno if you want the larger community (47,992 stars) or its MIT licence terms. Choose zod-to-openapi if its feature set, stack or MIT licence fits better. Both are self-hostable.