head to head · open source
OpenAPI-Specification vs Yaak
OpenAPI-Specification has 31,291 GitHub stars, 9,145 forks, 80 open issues and last shipped 12 days ago. Yaak has 19,399 stars, 840 forks, 19 open issues and last shipped yesterday. OpenAPI-Specification leads on adoption by 61% (31,291 vs 19,399 stars). OpenAPI-Specification is written in Markdown under Apache-2.0; Yaak is written in TypeScript under MIT. OpenAPI-Specification 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-Specification | Yaak | |
|---|---|---|
| GitHub stars | ★ 31K | ★ 19K |
| License | Apache-2.0 | MIT |
| Written in | Markdown | TypeScript |
| Last push | 2026-10-22 | 2026-11-02 |
| Forks | ⑂ 9.1K | ⑂ 840 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick OpenAPI-Specification if
- You weight community size — 31K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Markdown
- 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-Specification
The OpenAPI Specification The OpenAPI Specification is a community driven open specification within the OpenAPI Initiative, a Linux Foundation Collaborative Project. The OpenAPI Specification (OAS) defines a standard, programming language agnostic interface description for HTTP APIs. This allows both humans and computers to discover and understand the capabilities of a service without requiring access to source code, additional documentation, or inspection of network traffic. When properly defined via OpenAPI, a consumer can understand and interact with the remote service with a minimal amount of implementation…
read the full OpenAPI-Specification overview →
About Yaak
💫 Yaak ➟ Desktop API Client 💫 A fast, privacy first API client for REST, GraphQL, SSE, WebSocket, and gRPC – built with Tauri, Rust, and React. Development is funded by community purchased licenses . You can also become a sponsor to have your logo appear below. 💖 Features Yaak is an offline first API client designed to stay out of your way while giving you everything you need when you need it. Built with Tauri, Rust, and React, it’s fast, lightweight, and private. No telemetry, no VC funding, and no cloud lock in. 🌐 Work with any API Import collections from Postman, Insomnia, OpenAPI, Swagger, or Curl. Send…
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Frequently asked questions
Is OpenAPI-Specification or Yaak more popular?
OpenAPI-Specification has 31,291 GitHub stars and Yaak has 19,399. OpenAPI-Specification has the larger community by that measure.
Are OpenAPI-Specification and Yaak free?
Both are open source. OpenAPI-Specification is licensed under Apache-2.0 and Yaak under MIT. Neither carries a licence fee.
What is the difference between OpenAPI-Specification and Yaak?
OpenAPI-Specification is written in Markdown 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-Specification or Yaak?
Choose OpenAPI-Specification if you want the larger community (31,291 stars) or its Apache-2.0 licence terms. Choose Yaak if its feature set, stack or MIT licence fits better. Both are self-hostable.