AI SDK vs LangChain

LangChain is a broader framework for LLM apps, while AI SDK is a TypeScript-focused, Vercel-integrated toolkit.

Which to pick

What it is: AI SDK:A unified TypeScript SDK for building AI apps and agents with streaming, fallbacks, and multi-model support.; LangChain:LangChain is an open platform for building, testing, deploying, monitoring, and governing LLM agents.
Best for: AI SDK:Framework-agnostic TypeScript AI SDK; LangChain:End-to-end agent engineering platform
Who it’s for: AI SDK:Frontend and backend developers building AI-powered apps with JavaScript/TypeScript.; LangChain:Developers and teams building AI agents and LLM-powered applications.
Pricing: AI SDK:Open source; LangChain:Freemium
Plans: AI SDK:—; LangChain:Developer $0 per seat per month · Plus $39 per seat per month
Open source: AI SDK:Yes, 27,076 GitHub stars; LangChain:Yes, 147,359 GitHub stars
Works with: AI SDK:React, Next.js, Vue, Svelte, Angular, Node.js, Vercel AI Gateway; LangChain:—

Multi-provider support. Switch between AI providers with a single line of code.
Built-in streaming. Real-time responses work out-of-the-box without custom parsing.
Fallback handling. Provides reliable production behavior by default.
AI Gateway compatibility. Route any model through one endpoint via Vercel AI Gateway.
Framework-agnostic UI hooks. Hooks for React, Next.js, Vue, Svelte, Angular, etc., to build chat and generative interfaces.
Agent workflow tools. Supports long-running agents that can suspend, resume, and survive function timeouts.

Build agents fast. Start with proven patterns, customize harness, context, memory and model choice.
Trace-based testing. Debug runs with step-by-step tracing and query complex traces instantly.
Managed deployments. Deploy long-running agents with serverless or dedicated sandboxes and 30+ endpoints.
Production monitoring. Online evals, dashboards and alerts track quality, cost, latency and errors.
Feedback loop engine. Automatically detect issues, diagnose root causes and feed fixes back into evals.
Governance controls. Enforce cost limits, data redaction and human approval via LLM Gateway.

Is AI SDK or LangChain free?+

AI SDK is free and open source. LangChain has a free plan (Developer); paid plans start at $39/month per user (Plus).

Which is cheaper, AI SDK or LangChain?+

AI SDK is free, so it costs less. LangChain starts at $39/month per user (Plus).

Is AI SDK or LangChain open source?+

Yes, both are open source: AI SDK (vercel/ai on GitHub) and LangChain (langchain-ai/langchain on GitHub, MIT license).

AI SDK

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LangChain

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Based on each tool's website and DevHunt data. Details may change; check the official sites.