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Comparison guide
Langchain vs Llamaindex
Side-by-side NPM package comparison
Quick Verdict
Langchain leads across all categories in this comparison. Check the detailed metrics below to see how each package performs for your specific needs.
llamaindex
<p align="center"> <img height="100" width="100" alt="LlamaIndex logo" src="https://ts.llamaindex.ai/square.svg" /> </p> <h1 align="center">LlamaIndex.TS</h1> <h3 align="center"> Data framework for your LLM application. </h3>
166.8K weekly downloads · 2.6 MB gzip · Health 63/100
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Choosing between Langchain and Llamaindex? 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
Langchain leads with 3.1M weekly downloads — roughly 18.4x more. Llamaindex has 166.8K weekly downloads. Higher download counts generally indicate broader community adoption and a larger ecosystem of tutorials, plugins, and support.
Bundle Size
Langchain has the smallest gzipped bundle at 114.7 KB. Llamaindex comes in at 2.6 MB. A smaller bundle size means faster page loads, which improves user experience and Core Web Vitals scores.
Health Score Comparison
Langchain has an overall health score of 85/100 (very good), with strong maintenance, security, popularity scores. Llamaindex has an overall health score of 63/100 (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 Langchain if you value large community support, actively maintained, strong security track record. Choose Llamaindex if you value strong security track record.
Our Verdict
Both Langchain and Llamaindex are solid choices for JavaScript development. Langchain 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 langchain better than llamaindex?
- It depends on your needs. Langchain has a health score of 85/100 while Llamaindex scores 63/100. Langchain has more recorded weekly downloads (3.1M). Consider your specific requirements — bundle size, community support, and feature set — to decide which is the better fit.
- Which has a smaller bundle size, langchain or llamaindex?
- Langchain has the smaller gzipped bundle at 114.7 KB. A smaller bundle means faster load times for your users, which can positively impact SEO and user experience.
- How many developers use langchain vs llamaindex?
- Langchain has more recorded weekly downloads (3.1M). Download counts reflect package installations, not unique developers.
- Which is better maintained, langchain or llamaindex?
- Langchain has a maintenance score of 100/100. Langchain scores 100/100 and Llamaindex scores 40/100 on maintenance.
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