Available worldwide
What is Vitest?
Vitest is a test runner built on Vite that understands your Vite configuration and reuses its build pipelines. It's Jest-compatible, supports TypeScript and JSX out of the box, and works for both frontend and backend code.
Vitest pricing
We don't have Vitest's full plan breakdown yet (its pricing page resisted automated reading). Here's what we could confirm. Always check live pricing for exact numbers.
Free and open source
What Vitest does
The capabilities that matter for testing tools, normalised so it lines up with every alternative. “-” means we haven't confirmed it, not that it's missing.
- Test types
- -
- Browser automation
- ✓
- Built-in assertion library
- ✓
- Languages
- TypeScript, JSX
- Mocking / stubbing
- ✓
- Snapshot testing
- ✓
- Parallel execution
- ✓
- Code coverage
- ✓
- Watch mode
- ✓
- CI integration
- -
Platform & deployment
Independently observed- CLI
- Self-hosted
Integrations (2)
Independently observed- Vite
- Jest
Security & compliance
Known vulnerabilities: 3 (2 in the last 12 months), max severity CRITICAL sourcea count reflects scale & disclosure, not quality
Vitest FAQ
Common questions about Vitest, answered from independent, dated evidence.
What is Vitest and who should use it?
Vitest is a testing framework designed specifically for projects built with Vite. It reuses Vite's configuration and build plugins, eliminating duplicate setup when your application and tests share the same build pipeline. Developers using Vite benefit from streamlined testing without configuration overhead, though Vitest also works with projects that don't use Vite.
Source: https://vitest.dev
Does Vitest support TypeScript, JSX, and modern JavaScript out of the box?
Yes, Vitest natively supports ESM, TypeScript, and JSX without requiring additional configuration or build steps. The framework automatically recognizes these modern JavaScript features through its integration with Vite's transformation pipeline, reducing setup complexity for developers working with contemporary toolchains.
Source: https://vitest.dev
How does Vitest's watch mode differ from other test runners?
Vitest's watch mode intelligently reruns only the tests affected by changes in your code, similar to how Vite's Hot Module Reload works for development. This approach is faster than manually filtering tests or waiting for full test suite reruns after each edit, improving developer experience during development cycles.
Source: https://vitest.dev
Can I run tests in actual browsers with Vitest?
Yes, Vitest includes a browser mode that executes tests in real browsers using Playwright (supporting Chromium, Firefox, and WebKit) or WebdriverIO (supporting Chrome, Firefox, Edge, and Safari). This enables genuine DOM interaction testing, component testing, and visual regression detection rather than relying on DOM simulation.
Is Vitest compatible with Jest, and can I migrate from Jest?
Vitest provides API compatibility with Jest, including support for `expect()` assertions, snapshot testing, and mocking. This makes it a potential drop-in replacement for Jest projects, though Vitest is optimized for Vite-based applications and may require configuration adjustments if your project uses other build systems.
What code coverage options does Vitest provide?
Vitest supports two coverage providers: V8 (native, faster, lower memory usage) and Istanbul (works with any JavaScript runtime but slower). Both providers generate multiple report formats including HTML, text summaries, and LCOV, and allow filtering which files to include or exclude from coverage calculations.
What are Vitest's system requirements and minimum dependencies?
Vitest requires Node.js version 20 or later and Vite version 6 or later. It can be installed and run through common package managers including npm, yarn, pnpm, and bun, making it accessible to most JavaScript development environments.
Source: https://vitest.dev/guide/
Is Vitest free and open-source?
Yes, Vitest is completely free and open-source, maintained by a community of contributors with support from corporate sponsors. There is no licensing cost, commercial licensing model, or requirement to pay for core features or basic usage.
Source: https://vitest.dev
Vitest alternatives
Other testing tools we track, ranked by the same independent score.
- JestJavaScript testing framework with integrated assertions and code coveragemedium · 70%
- PlaywrightCross-browser automation library for building reliable tests and scriptshigh · 77%
- pytestA Python testing framework that simplifies writing tests and scales to complex testing scenariosmedium · 73%
- SeleniumAutomated web browser control for testing and task automationhigh · 77%
- CypressJavaScript testing framework for automated browser testingmedium · 71%
- PuppeteerA JavaScript library for automating and testing web browsersmedium · 68%
Compare Vitest
Side by side against other testing tools, attribute by attribute, with a source on every value.
The vioscaleAI score: one lens on the evidence
Not user reviews and not a paid placement: a confidence-weighted blend of the independent signals below (adoption, activity, security posture, and more), which you can sort and re-weight yourself. Vendors can correct their listing but can never move their rank, and stars are weighted low as a vanity metric. It is one way to read the evidence for Vitest, not the verdict.
| Signal | Score | Weight | Contribution | Evidence |
|---|---|---|---|---|
| Package downloads | 100 | 0.17 | 17.3 | ✓ |
| Development activity | 63 | 0.12 | 7.6 | ✓ |
| Capabilities | 87 | 0.08 | 7.2 | ✓ |
| Release cadence | 98 | 0.07 | 6.6 | ✓ |
| Dependent projects | 75 | 0.08 | 6.0 | ✓ |
| Developer Q&A activity | 55 | 0.08 | 4.4 | ✓ |
| Stars | 80 | 0.03 | 2.6 | ✓ |
| Integrations | 14 | 0.05 | 0.7 | ✓ |
| Security posture | 0 | 0.09 | 0.0 | - |
| Security score | 0 | 0.05 | 0.0 | - |
Computed . Re-weight it by intent, or see the full method.
All data & sourcesshow ↓
Every value we hold, with its source, retrieval date, and confidence. This is the evidence behind the score: don't trust it, verify it.
Activity
| Attribute | Value | Evidence |
|---|---|---|
| Commits last 30d | 100 | mediumsource · 2026-09-10 · 65% |
Adoption
Content
| Attribute | Value | Evidence |
|---|---|---|
| Faq | 8 items | highsource · 2026-07-30 · 93% |
Features
| Attribute | Value | Evidence |
|---|---|---|
| Capabilities | Mocking: Yes · Coverage: Yes · Languages: TypeScript, JSX · Assertions: Yes · Watch mode: Yes · Snapshot testing: Yes | mediumsource · 2026-09-10 · 60% |
Integrations
| Attribute | Value | Evidence |
|---|---|---|
| Count | 2 | mediumsource · 2026-08-14 · 60% |
Language
| Attribute | Value | Evidence |
|---|---|---|
| Primary | TypeScript | highsource · 2026-09-10 · 90% |
License
| Attribute | Value | Evidence |
|---|---|---|
| Spdx | MIT | highsource · 2026-09-10 · 99% |
Market
| Attribute | Value | Evidence |
|---|---|---|
| Availability | Source: https://vitest.dev · HqCountry: US · Confidence: 0.9 · PrimaryMarkets: … · AvailabilityScope: global · AvailableCountries: … | highsource · 2026-07-30 · 90% |
Pricing
Release
Security
| Attribute | Value | Evidence |
|---|---|---|
| Vulnerabilities | Count: 3 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=npm&package_name=vitest&per_page=100 · Last 12m: 2 · Max severity: CRITICAL | highsource · 2026-09-10 · 90% |
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