Side by side
Japa vs Web Test Runner
Both stand on javascript testing frameworks. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan ExtensionWeb
Japa brings backend, API, and browser testing into a single framework with multiple assertion options. Its ES module requirement and project-level setup are important fit considerations.
Visit Japa
Free plan LinuxMacSelf-hosted+2
Web Test Runner combines isolated browser runs with debugging, watch mode, and coverage features. Its documented launchers span local and remote browser testing, while coverage defaults to Chromium.
Visit Web Test RunnerThe facts
| Japa | Web Test Runner | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Not published |
| Runs on | Extension, Web | Linux, Mac, Self-hosted, Web, Windows |
| Lowest paid plan | Not published | Free or on request |
| Plans published | None | 1 |
| Maker | Not published | Not published |
| Website | japa.dev | modern-web.dev |
| On javascript testing frameworks | #8 of 23 | #12 of 23 |
Japa: what it does well
- Supports API and browser testing.
- Includes datasets, snapshots, filtering, and lifecycle hooks.
- OpenAPI plugin checks response structure.
- Official VS Code extension can run tests.
- Free plan available.
What to know first
- Requires Node.js 18 or later.
- Works only with the ES module system.
- No separate CLI; requires a configured entry point.
Web Test Runner: what it does well
- Runs test files in parallel and isolation
- Supports Chromium, Firefox, and WebKit through Playwright
- Watch mode reruns tests when files change
- Coverage includes configurable thresholds and reports
- Free and MIT-licensed
What to know first
- Default coverage instrumentation uses Chromium
- BrowserStack remote testing requires its launcher
- Installation is as an npm development dependency
Alternatives to Japa Alternatives to Web Test Runner The whole list