AI Developer Tools

San Francisco, United StatesHealth 55/100

LlamaIndex is one of the leading data frameworks for building LLM applications and retrieval-augmented generation (RAG) systems, founded and headquartered in San Francisco, California. Founded by Jerry Liu (former Robust Intelligence and Quora ML engineer) and Simon Suo, LlamaIndex provides Python and TypeScript frameworks for connecting LLMs to private and proprietary data sources including documents, databases, APIs, and unstructured content. Products include the open-source LlamaIndex framework with 35,000 GitHub stars, LlamaParse for advanced document parsing, LlamaCloud managed RAG service for enterprises, and LlamaHub with hundreds of pre-built data connectors and tools. LlamaIndex raised 19 million Series A at a 90 million valuation.

San Francisco, United StatesHealth 55/100

LangChain is the worlds most popular framework for building LLM-powered applications, founded and headquartered in San Francisco, California. Founded by Harrison Chase and Ankush Gola, LangChain provides the open-source LangChain framework with Python and JavaScript libraries, the LangGraph orchestration framework for stateful AI agents, LangSmith for observability and evaluation, and LangServe for deployment. The platform supports integrations with all major LLMs including OpenAI, Anthropic, Google, Cohere, and open-source models, plus hundreds of vector databases, document loaders, and tools. LangChain has over 100,000 GitHub stars, is used by companies including Klarna, Replit, Rakuten, Elastic, and Morningstar, and raised 25 million Series A at a 200 million valuation.