Is jest better than vitest?

It depends on your needs. Jest has a health score of 62/100 while Vitest scores 67/100. Jest has more weekly downloads (0), suggesting broader adoption. Consider your specific requirements — bundle size, community support, and feature set — to decide which is the better fit.

Which has a smaller bundle size, jest or vitest?

Jest has the smaller gzipped bundle at 2.0 KB. A smaller bundle means faster load times for your users, which can positively impact SEO and user experience.

How many developers use jest vs vitest?

Based on npm download statistics, Jest has approximately 0 weekly downloads and Vitest has approximately 0 weekly downloads. These numbers reflect package installations, not unique developers, but they indicate relative adoption levels.

Which is better maintained, jest or vitest?

Vitest currently has the higher overall health score at 67/100. Jest has a maintenance score of 60/100 and Vitest scores 100/100 on maintenance.

Which is the best overall choice between Jest and Vitest?

Based on a weighted analysis of popularity, bundle size, maintenance, and code quality, Jest is the overall recommended pick. It has 0 weekly downloads, a 2.0 KB gzipped bundle, and a health score of 62/100. However, the best choice depends on your specific project requirements.

Comparison guide

Jest vs Vitest

Side-by-side NPM package comparison

Quick Verdict

Smallest Bundle

Jest

2.0 KB gzipped

jest

Niche

Version 30.4.2

Good

Delightful JavaScript Testing.

Weekly Downloads: 0

Bundle (gzip): 2.0 KB
Updated: 3 months ago
Vulns: 0

Health Score Breakdown

Maintenance

Popularity

Quality

Security

100

Stability

vitest

Niche

Version 4.1.11

Good

Next generation testing framework powered by Vite

Weekly Downloads: 0

Bundle (gzip): 83.7 KB
Updated: 8 days ago
Vulns: 0

Health Score Breakdown

Maintenance

100

Popularity

Quality

Security

100

Stability

Choosing between Jest and Vitest? Here's a data-driven comparison based on real npm data — downloads, bundle size, health scores, and more — to help you decide which package fits your project best.

Downloads & Popularity

Jest and Vitest both have 0 weekly downloads, indicating equal adoption in the ecosystem.

Bundle Size

Jest has the smallest gzipped bundle at 2.0 KB. Vitest comes in at 83.7 KB. A smaller bundle size means faster page loads, which improves user experience and Core Web Vitals scores.

Health Score Comparison

Vitest has an overall health score of 67/100 (good), with strong maintenance, security scores. Jest has an overall health score of 62/100 (good), with strong quality, security scores. Health scores are calculated from maintenance activity, code quality, security posture, popularity, and stability metrics.

When to Choose Each

Choose Jest if you value minimal bundle footprint, strong security track record. Choose Vitest if you value actively maintained, strong security track record.

Our Verdict

Both Jest and Vitest are solid choices for JavaScript development. Vitest has the edge in overall health score (67/100), while each package brings unique strengths to the table. Evaluate them based on your project's priorities — whether that's community size, bundle efficiency, or maintenance activity — and choose the one that aligns best with your requirements.

Frequently Asked Questions

Is jest better than vitest?: It depends on your needs. Jest has a health score of 62/100 while Vitest scores 67/100. Jest has more weekly downloads (0), suggesting broader adoption. Consider your specific requirements — bundle size, community support, and feature set — to decide which is the better fit.
Which has a smaller bundle size, jest or vitest?: Jest has the smaller gzipped bundle at 2.0 KB. A smaller bundle means faster load times for your users, which can positively impact SEO and user experience.
How many developers use jest vs vitest?: Based on npm download statistics, Jest has approximately 0 weekly downloads and Vitest has approximately 0 weekly downloads. These numbers reflect package installations, not unique developers, but they indicate relative adoption levels.
Which is better maintained, jest or vitest?: Vitest currently has the higher overall health score at 67/100. Jest has a maintenance score of 60/100 and Vitest scores 100/100 on maintenance.

Jest vs Vitest: The Established Standard vs The Modern Challenger

Jest and Vitest are the two dominant JavaScript testing frameworks in 2026, and migrating from Jest to Vitest has become one of the most common developer tooling upgrades. Jest, maintained by Meta, set the standard for JavaScript testing with snapshot testing, built-in mocking, and zero-config setup. Vitest, built on top of Vite, offers a Jest-compatible API with dramatically faster test execution — often 3-5x faster for large test suites thanks to Vite's native ES module handling and on-demand transformation.

The key differentiator is developer experience during active development. Vitest's watch mode re-runs only affected tests nearly instantly, because it leverages Vite's module graph to know exactly which tests depend on which files. Jest's watch mode is functional but noticeably slower, especially in large monorepos. Vitest also shares your Vite configuration, so if your project already uses Vite, there's zero additional build config for tests — your path aliases, plugins, and transforms just work.

If you're on a Vite-based project (Vue, Svelte, Solid, or React with Vite), Vitest is the clear choice — faster execution, shared config, and seamless integration. If you're on Next.js or a non-Vite build system, Jest remains well-supported and reliable. For new projects in 2026, Vitest is the default recommendation unless you depend specifically on Jest's ecosystem.

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