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Comparison guide

Automerge vs Loro vs Yjs

Side-by-side NPM package comparison

Quick Verdict

Smallest Bundle

Yjs

27.5 KB gzipped

Most Popular

Yjs

9.9M weekly downloads

Best Maintained

Yjs

100/100 maintenance score

Highest Quality

Automerge

50/100 quality score

Overall Pick

Yjs

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

  1. automerge

    Reimplementation of `automerge` on top of the automerge-wasm backend

    6.1K weekly downloads · 34.2 KB gzip · Health 63/100

    0
  2. loro

    Simple Server that response JSON objects

    30 weekly downloads · 239.5 KB gzip · Health 43/100

    0
  3. yjs

    Shared Editing Library

    9.9M weekly downloads · 27.5 KB gzip · Health 85/100

    0

Choosing between Automerge and Loro and Yjs? 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

Yjs leads with 9.9M weekly downloads — roughly 1623.0x more. Automerge has 6.1K weekly downloads. Loro has 30 weekly downloads. Higher download counts generally indicate broader community adoption and a larger ecosystem of tutorials, plugins, and support.

Bundle Size

Yjs has the smallest gzipped bundle at 27.5 KB. Automerge comes in at 34.2 KB. Loro comes in at 239.5 KB. A smaller bundle size means faster page loads, which improves user experience and Core Web Vitals scores.

Health Score Comparison

Yjs has an overall health score of 85/100 (very good), with strong maintenance, security, popularity scores. Automerge has an overall health score of 63/100 (good), with strong security scores. Loro has an overall health score of 43/100 (moderate), with strong security scores. Health scores are calculated from maintenance activity, code quality, security posture, popularity, and stability metrics.

When to Choose Each

Choose Automerge if you value strong security track record. Choose Loro if you value strong security track record. Choose Yjs if you value large community support, actively maintained, strong security track record.

Our Verdict

Both Automerge and Loro and Yjs are solid choices for JavaScript development. Yjs has the edge in overall health score (85/100), 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 automerge better than loro?
It depends on your needs. Automerge has a health score of 63/100 while Loro scores 43/100. Automerge has more recorded weekly downloads (6.1K). Consider your specific requirements — bundle size, community support, and feature set — to decide which is the better fit.
Which has a smaller bundle size, automerge or loro?
Automerge has the smaller gzipped bundle at 34.2 KB. A smaller bundle means faster load times for your users, which can positively impact SEO and user experience.
How many developers use automerge vs loro?
Automerge has more recorded weekly downloads (6.1K). Download counts reflect package installations, not unique developers.
Which is better maintained, automerge or loro?
Automerge has a maintenance score of 60/100. Automerge scores 60/100 and Loro scores 20/100 on maintenance.

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