Keploy vs Swagger UI
A side-by-side comparison of two self-hosted developer tools & git options — licensing, setup difficulty, resource needs, and what each one replaces.
| Feature | Keploy | Swagger UI |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 95 · Excellent | 98 · Excellent |
| Category | Developer Tools & Git | Developer Tools & Git |
| License | Apache-2.0 | Apache-2.0 |
| Language | Go | JavaScript |
| Setup difficulty | Medium | Easy |
| Min. RAM | 256 MB | 128 MB |
| Deployment | docker, binary | docker, bare-metal |
| GitHub stars | ★ 18,479 | ★ 29,018 |
| First released | 2022 | 2011 |
| Replaces | Postman | Postman |
What are Keploy and Swagger UI?
Keploy
Keploy is an open-source testing toolkit that records API calls and database interactions to automatically generate test cases and data mocks. It is self-hosted as a CLI and server for backend testing.
- Tests from real traffic
- Auto-generated mocks
- CI integration
- No code changes needed
Swagger UI
Swagger UI renders OpenAPI specifications as interactive, browser-based API documentation. It lets developers explore and try out endpoints directly from the docs.
- Interactive API docs
- Try-it-out console
- OpenAPI 3.x support
- Embeddable in any site
Keploy vs Swagger UI: key differences
Keploy is written in Go, while Swagger UI is built with JavaScript. Swagger UI is the lighter option, starting around 128 MB of RAM against 256 MB for Keploy. Swagger UI is the more established project (first released 2011), while Keploy arrived in 2022.
Why pick each one
Choose Keploy if…
- Tests from real traffic
- Automatic mock generation
- CI-friendly CLI
Watch out for
- Linux-centric capture
- Setup varies per stack
Choose Swagger UI if…
- Interactive try-it-out
- Simple static hosting
- Industry standard
Watch out for
- Needs well-maintained specs
- Large specs render slowly
Frequently asked questions
Is Keploy or Swagger UI better?
Swagger UI is the stronger all-round pick: it has both the larger community and the simpler easy setup. Consider Keploy if its specific feature set fits your needs better.
Are Keploy and Swagger UI free and open-source?
Yes. Keploy is licensed under Apache-2.0 and Swagger UI under Apache-2.0. Both can be self-hosted at no software cost.
Can I run Keploy and Swagger UI with Docker?
Keploy: yes. Swagger UI: yes.
Which is lighter on resources, Keploy or Swagger UI?
Swagger UI has the smaller minimum footprint at 128 MB of RAM, compared to about 256 MB for Keploy. Real-world usage depends on library size, user count, and enabled features.