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LangChain.js vs LlamaIndex OSS Stack
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LangChain.js
AI ToolsLangChain.js is a framework designed for developing applications powered by large language models. It enables the construction of complex LLM workflows by chaining together interoperable components and integrating with third-party services. The framework provides support for agents, prompt management, and intricate application logic. It offers a broad ecosystem for various LLM application elements, including chains, agents, tools, and memory. While capable of RAG, its general-purpose nature extends to orchestrating diverse components, making it suitable for applications where RAG is one part of a larger system.
LlamaIndex OSS Stack
Pricing & LicensingApache-licensed retrieval and agent framework for builders.
Pricing
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LangChain.js
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LlamaIndex OSS Stack
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At a Glance
LangChain.js
Pricing
paid
Key Features
LangChain 1.0 and LangGraph 1.0 were launched around October 2025, signifying maturity in the ecosystem. · LangSmith introduced significant enhancements between July 2025 and June 2026, including Harbor for Agent Evaluations (June 30, 2026) and an LLM Gateway for cost control (June 14, 2026). · User reception for LangChain averages 4.8/5 based on 15 reviews on G2 and 4.9/5 based on 109 reviews on Product Hunt.
LlamaIndex OSS Stack
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