LlamaIndex

The data framework for RAG

LLM / RAG frameworkData / RAG frameworkMITCloud-optionalPythonIntermediate

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🐳 Docker pulls 📦 PyPI downloads / month 📦 npm downloads / month 🚀 Latest release ·

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What is LlamaIndex?

LlamaIndex is a data framework focused on connecting LLMs to your data, with best-in-class ingestion, indexing and retrieval for RAG applications.

Why people choose LlamaIndex

Best-in-class ingestion and indexing for RAG
Many data connectors and retrievers
Focused, RAG-first design

LlamaIndex at a glance

Category	LLM / RAG framework
Type	Data / RAG framework
License	MIT
Runs locally	Cloud-optional
Built with	Python
Skill level	Intermediate
Best for	developers building data-heavy RAG apps

Open-source alternatives to LlamaIndex

Other open-source llm / rag framework tools worth comparing:

LangChainCompose chains, tools and agents

HaystackProduction pipelines for search and RAG

DSPyProgram — not prompt — language models

txtaiAll-in-one embeddings database

RAGFlowDeep-document-understanding RAG

Semantic KernelMicrosoft's enterprise agent framework

GraphRAGRAG that builds a knowledge graph first

LiteLLMOne API for 100+ LLM providers

InstructorReliable structured outputs from LLMs

OutlinesGuarantee valid JSON and grammars

GuidanceInterleave control and generation

LLMWareEnterprise RAG with small specialised models

FlashRankUltra-light reranking for better RAG

Sentence TransformersThe standard way to make embeddings

RagasMeasure whether your RAG is any good

PromptfooUnit tests for your prompts

LangfuseSee what your LLM app actually did

PhoenixTrace, evaluate and debug LLM apps

LlamaIndex head-to-head

LlamaIndex vs LangChain LlamaIndex vs Haystack LlamaIndex vs DSPy LlamaIndex vs txtai LlamaIndex vs RAGFlow LlamaIndex vs Semantic Kernel LlamaIndex vs GraphRAG LlamaIndex vs LiteLLM LlamaIndex vs Instructor LlamaIndex vs Outlines LlamaIndex vs Guidance LlamaIndex vs LLMWare LlamaIndex vs FlashRank LlamaIndex vs Sentence Transformers LlamaIndex vs Ragas LlamaIndex vs Promptfoo LlamaIndex vs Langfuse LlamaIndex vs Phoenix

FAQ

Is LlamaIndex free?

LlamaIndex is free and open-source (MIT license), so you can use, self-host and modify it at no cost.

Can I run LlamaIndex locally?

LlamaIndex can be used locally or in the cloud depending on your setup.

What is the best alternative to LlamaIndex?

Popular open-source alternatives include LangChain, Haystack, DSPy. See the comparisons above to choose.

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