Quick Comparison
| Vitest | Jest | |
|---|---|---|
| Speed | Faster (Vite-powered) | Slower |
| Config | Shares Vite config | Separate config |
| TypeScript | Native | Needs ts-jest or SWC |
| ESM | Native | Experimental |
| Watch mode | Instant (HMR) | Slower |
| Compatibility | Jest-compatible API | N/A |
When to Use Vitest
- Vite-based projects (React, Vue, Svelte)
- You want faster test runs
- You want native TypeScript and ESM support
- New projects
When to Use Jest
- Existing projects with Jest tests
- Create React App or non-Vite setups
- You need a specific Jest plugin
- Your team knows Jest well
Verdict
Vitest for new Vite-based projects — it’s faster and simpler to configure. Jest if you’re already using it or need its massive plugin ecosystem.