Head-to-Head Comparison
LangChain.js vs LlamaIndex.TS
Compare features, pricing, integrations, and community reviews
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.TS
AI ToolsLlamaIndex.TS is a TypeScript framework for building generative AI applications, RAG chatbots, and multi-agent workflows by connecting LLMs with private data. LlamaIndex.ts is a data framework specifically designed for building context-aware AI agents and RAG (Retrieval-Augmented Generation) applications by connecting LLMs with private or external data sources.
Pricing
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LangChain.js
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LlamaIndex.TS
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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.TS
Pricing
paid
Key Features
LlamaIndex.TS was officially deprecated on March 11, 2026, with its last release on December 2, 2025. · It provided data connectors for over 160 diverse sources, including APIs, files, and SQL databases. · The framework enabled the creation of context-aware AI agents and Retrieval-Augmented Generation (RAG) applications.
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