LangChain
Most popular framework for building LLM applications
Overview
LangChain is the framework that defined "LLM application development" as a discipline — chains, agents, RAG patterns, tool calling. Python and JavaScript libraries; LangSmith for observability; LangServe for deployment. Open-source core; commercial LangSmith/LangGraph tiers.
Pricing
Pricing shown for reference only. These figures reflect RECATOOLS research as of 19 May 2026 and may be out of date or incomplete. This is not financial or purchasing advice — always confirm the current price on the provider’s official website before making any decision.
Use cases
ASEAN Perspective
LangChain in Southeast Asia
ASEAN-region availability and pricing notes coming soon. Drop the editorial team a note via /contact/ if you can supply local context (Singapore/Malaysia/Indonesia/Thailand/Vietnam).
LangChain is the de facto starting point for building LLM applications, agents and RAG pipelines, with the largest integration ecosystem of any framework and broad Python/JS support. It suits teams who want pre-built connectors and abstractions to move fast, and it pairs naturally with LangSmith and LangGraph for tracing and orchestration.
The long-standing criticism is over-abstraction: the layers can obscure what is actually happening, version churn has been heavy, and many production teams eventually drop down to lighter primitives. It is free and globally available, with solid docs but a real learning curve once you move past the quickstarts. No SEA-specific provisions.
Notable facts
- LangChain reached 50,000 GitHub stars within 3 months of release, making it one of the fastest-growing developer frameworks in history.
- Harrison Chase built the first version of LangChain in a weekend as an experiment and open-sourced it without expecting widespread adoption.
- LangChain's npm package is downloaded over 1 million times per week, making it one of the most-used AI libraries in the JavaScript ecosystem.
Frequently asked questions
About this listing
This entry was compiled from publicly available data including LangChain's official website, press releases, documentation, and reputable third-party publications. RECATOOLS is not affiliated with LangChain unless explicitly stated.
Third-party AI tools update their pricing, features, availability, and policies frequently. Information here may be outdated by the time you read this — we make reasonable efforts to keep listings current, but cannot guarantee absolute accuracy.
For the latest details, please refer to LangChain directly →
Spotted something out of date? Suggest an update →
Alternatives to LangChain
More in Agents & Automation
