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Comparison guide
Bun-test vs Jest vs Vitest
Side-by-side NPM package comparison
Quick Verdict
Smallest Bundle
Jest
2.0 KB gzipped
Most Popular
Vitest
77.5M weekly downloads
Best Maintained
Vitest
100/100 maintenance score
Highest Quality
Jest
80/100 quality score
Overall Pick
Jest
Best all-around based on popularity, size, maintenance & quality
vitest
Next generation testing framework powered by Vite
77.5M weekly downloads · 89.4 KB gzip · Health 85/100
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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
Vitest leads with 77.5M weekly downloads — roughly 3.0x more. Jest has 25.8M weekly downloads. Higher download counts generally indicate broader community adoption and a larger ecosystem of tutorials, plugins, and support.
Bundle Size
Jest has the smallest gzipped bundle at 2.0 KB. Vitest comes in at 89.4 KB. A smaller bundle size means faster page loads, which improves user experience and Core Web Vitals scores.
Health Score Comparison
Jest has an overall health score of 86/100 (very good), with strong maintenance, quality, security, popularity scores. Vitest has an overall health score of 85/100 (very good), with strong maintenance, security, popularity 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 massive community and ecosystem, minimal bundle footprint, strong security track record. Choose Vitest if you value massive community and ecosystem, actively maintained, strong security track record.
Our Verdict
Both Jest and Vitest are solid choices for JavaScript development. Jest has the edge in overall health score (86/100), 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 86/100 while Vitest scores 85/100. Vitest has more recorded weekly downloads (77.5M). 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?
- Vitest has more recorded weekly downloads (77.5M). Download counts reflect package installations, not unique developers.
- Which is better maintained, jest or vitest?
- Vitest has a maintenance score of 100/100. Jest scores 80/100 and Vitest scores 100/100 on maintenance.
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One PDF: the best package for every category (ORMs, bundlers, auth, testing, state management). Used by 500+ devs. Free, updated monthly.