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Comparison guide

Ulid vs Uuid

Side-by-side NPM package comparison

Quick Verdict

Smallest Bundle

Ulid

1.9 KB gzipped

Most Popular

Uuid

358.3M weekly downloads

Best Maintained

Uuid

80/100 maintenance score

Highest Quality

Ulid

50/100 quality score

Overall Pick

Uuid

Best all-around based on popularity, size, maintenance & quality

  1. ulid

    A universally-unique, lexicographically-sortable, identifier generator

    14.4M weekly downloads · 1.9 KB gzip · Health 67/100

    0
  2. uuid

    RFC9562 UUIDs

    358.3M weekly downloads · 3.8 KB gzip · Health 79/100

    0

Choosing between Ulid and Uuid? 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

Uuid leads with 358.3M weekly downloads — roughly 24.9x more. Ulid has 14.4M weekly downloads. Higher download counts generally indicate broader community adoption and a larger ecosystem of tutorials, plugins, and support.

Bundle Size

Ulid has the smallest gzipped bundle at 1.9 KB. Uuid comes in at 3.8 KB. A smaller bundle size means faster page loads, which improves user experience and Core Web Vitals scores.

Health Score Comparison

Uuid has an overall health score of 79/100 (very good), with strong maintenance, security, popularity scores. Ulid has an overall health score of 67/100 (good), with strong security, popularity scores. Health scores are calculated from maintenance activity, code quality, security posture, popularity, and stability metrics.

When to Choose Each

Choose Ulid if you value massive community and ecosystem, minimal bundle footprint, strong security track record. Choose Uuid if you value massive community and ecosystem, minimal bundle footprint, strong security track record.

Our Verdict

Both Ulid and Uuid are solid choices for JavaScript development. Uuid has the edge in overall health score (79/100), 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 ulid better than uuid?
It depends on your needs. Ulid has a health score of 67/100 while Uuid scores 79/100. Uuid has more recorded weekly downloads (358.3M). Consider your specific requirements — bundle size, community support, and feature set — to decide which is the better fit.
Which has a smaller bundle size, ulid or uuid?
Ulid has the smaller gzipped bundle at 1.9 KB. A smaller bundle means faster load times for your users, which can positively impact SEO and user experience.
How many developers use ulid vs uuid?
Uuid has more recorded weekly downloads (358.3M). Download counts reflect package installations, not unique developers.
Which is better maintained, ulid or uuid?
Uuid has a maintenance score of 80/100. Ulid scores 40/100 and Uuid scores 80/100 on maintenance.

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