Prism Mock vs Yaak
A side-by-side comparison of two self-hosted developer tools & git options — licensing, setup difficulty, resource needs, and what each one replaces.
| Feature | Prism Mock | Yaak |
|---|---|---|
| Deploy effort | Under-an-hour setup | Read-the-docs project |
| Health score | 90 · Excellent | 96 · Excellent |
| Category | Developer Tools & Git | Developer Tools & Git |
| License | Apache-2.0 | MIT |
| Language | TypeScript | TypeScript |
| Setup difficulty | Easy | Easy |
| Min. RAM | 128 MB | 256 MB |
| Deployment | docker, binary | binary, source |
| GitHub stars | ★ 5,035 | ★ 19,253 |
| First released | 2017 | 2024 |
| Replaces | Postman, Stoplight | Postman, Insomnia |
What are Prism Mock and Yaak?
Prism Mock
Prism is an open-source HTTP mock server and validation proxy that turns OpenAPI documents into working mock APIs. It can also validate live traffic against a specification for contract testing.
- OpenAPI-driven mocking
- Contract validation proxy
- Dynamic example responses
- CLI and Docker
Yaak
Yaak is a desktop API client for sending HTTP, GraphQL, and gRPC requests, designed to be fast and privacy-respecting. It stores data locally and supports plugins and Git-friendly workspaces.
- REST, GraphQL and gRPC support
- Local data storage
- Plugin system
- Git-friendly workspaces
Prism Mock vs Yaak: key differences
Both projects are written in TypeScript. Licensing differs — Apache-2.0 for Prism Mock versus MIT for Yaak. Prism Mock is the lighter option, starting around 128 MB of RAM against 256 MB for Yaak. Prism Mock is the more established project (first released 2017), while Yaak arrived in 2024. Yaak has the considerably larger community, at 19,253 GitHub stars versus 5,035. Prism Mock lists first-class Docker deployment; Yaak does not.
Why pick each one
Choose Prism Mock if…
- Spec stays the source of truth
- Good for contract testing
Watch out for
- Requires an OpenAPI doc
- Mock realism is limited
Choose Yaak if…
- Fast native app
- Local-first data storage
- Git-friendly workspaces
Watch out for
- Younger than rivals
- No built-in cloud sync
Frequently asked questions
Is Prism Mock or Yaak better?
Neither is universally better. Yaak has the larger community; both share a easy setup difficulty, so the decision comes down to features and licensing.
Are Prism Mock and Yaak free and open-source?
Yes. Prism Mock is licensed under Apache-2.0 and Yaak under MIT. Both can be self-hosted at no software cost.
Can I run Prism Mock and Yaak with Docker?
Prism Mock: yes. Yaak: check the project docs for container support.
Which is lighter on resources, Prism Mock or Yaak?
Prism Mock has the smaller minimum footprint at 128 MB of RAM, compared to about 256 MB for Yaak. Real-world usage depends on library size, user count, and enabled features.