Playwright vs Vitest

Playwright and Vitest operate in completely different layers of the testing pyramid. Vitest runs in Node.js and tests your JavaScript/TypeScript logic — functions, components, API handlers — without a browser. Tests run in milliseconds because there's no browser startup, no DOM rendering, no network calls. Playwright runs a real browser (Chromium, Firefox, or WebKit) and tests your full application as a user would experience it — clicking buttons, filling forms, navigating pages. Playwright tests are necessarily slower because they require a full browser environment.

A well-structured application needs both. Vitest handles the base of the pyramid: unit tests for utility functions, component tests for UI logic, integration tests for API routes. These tests are cheap, fast, and run on every commit. Playwright handles the top of the pyramid: critical user flows like signup, checkout, and core features. These tests are expensive, slow, and typically run on deployment or nightly. Choosing one over the other means leaving a layer of your test coverage unaddressed.

If you're using a Vite-based framework (Nuxt, SvelteKit, Astro), the combination is particularly natural. Vitest plugs directly into your Vite config for fast unit tests. Playwright has first-class Vite support and can test the built or dev-server output. Both tools are open source, maintained by active communities, and designed for modern ES module workflows. The two tools are complementary, not competitive.

The only scenario where you'd truly choose one over the other is for a very specific, narrow use case. If you're building a pure utility library with no UI, you only need Vitest. If you're testing a third-party web application you don't control, you only need Playwright. For most web application projects, the right answer is both tools in their appropriate roles: Vitest for logic, Playwright for browser flows.