head to head · open source
openapi-generator vs Yaak
openapi-generator has 26,745 GitHub stars, 7,674 forks, 5,751 open issues and last shipped yesterday. Yaak has 19,224 stars, 813 forks, 19 open issues and last shipped yesterday. openapi-generator leads on adoption by 39% (26,745 vs 19,224 stars). openapi-generator is written in Java under Apache-2.0; Yaak is written in TypeScript under MIT. openapi-generator has attracted 29% as many forks as stars, Yaak 4%. Yaak was the more recently maintained of the two, and both are self-hostable with no licence fee.
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
| openapi-generator | Yaak | |
|---|---|---|
| GitHub stars | ★ 27K | ★ 19K |
| License | Apache-2.0 | MIT |
| Written in | Java | TypeScript |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 7.7K | ⑂ 813 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick openapi-generator if
- You weight community size — 27K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Java
- You value the larger contributor base for long-term maintenance
pick Yaak if
- You want the Yaak feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and Yaak fits your workflow better
About openapi-generator
OpenAPI Generator is an Apache 2.0 licensed Java tool that generates API client libraries, server stubs, documentation, and configuration automatically from an OpenAPI Specification, and it is built for development teams that keep a machine readable API description and want generated code to stay in step with it.
read the full openapi-generator overview →
About Yaak
Yaak is a desktop API client for REST, GraphQL, gRPC, WebSocket, and Server Sent Events. It is built with Tauri, Rust, and React, and it lives in the developer tools ecosystem for API development and testing. The project presents itself as an offline first, privacy first alternative to Postman, Insomnia, and Bruno.
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Frequently asked questions
Is openapi-generator or Yaak more popular?
openapi-generator has 26,745 GitHub stars and Yaak has 19,224. openapi-generator has the larger community by that measure.
Are openapi-generator and Yaak free?
Both are open source. openapi-generator is licensed under Apache-2.0 and Yaak under MIT. Neither carries a licence fee.
What is the difference between openapi-generator and Yaak?
openapi-generator is written in Java and Yaak 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, openapi-generator or Yaak?
Choose openapi-generator if you want the larger community (26,745 stars) or its Apache-2.0 licence terms. Choose Yaak if its feature set, stack or MIT licence fits better. Both are self-hostable.