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LangChain

by LangChain

6M / mo
100% Free
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LangChain is the most widely adopted open-source framework for building applications powered by large language models. It provides modular components for chaining prompts, connecting LLMs to external data sources, memory systems, and tool-use APIs. Developers use LangChain as the scaffolding for AI assistants, autonomous agents, document Q&A systems, and complex multi-step pipelines.

LangChain features and capabilities, including which plan they need and how they compare in the CanIUse matrix.

langchainAdded 2025-09-21Catalog rank 9

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LangSmithLLM debugging, tracing, and evaluation by LangChainAdded 2025-06-15developer_toolscode_generationinfrastructuredeployment#5Freemium

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✨ Modalities

💬
Text Input
Yes, requires free plan. LangChain/LangGraph agents are text-in. Fleet lets teams build agents in natural language.
🖼️
Image Upload / Vision
Unknown. Depends on the model you wire. Not a first-party vision SKU.
🎨
Image Generation
No. Framework, not an image model.
🎙️
Voice Mode
No. Not a voice-assistant product.
🎥
Video Understanding
No. Not a video product.
🎬
Video Generation
No. Not a video generation product.
📁
File Upload (PDF, DOCX)
Partial. You add loaders in code. LangSmith is not a consumer PDF chat.
💻
Code Execution
Yes, requires plus plan. Deploy path: run agent-generated code in isolated sandboxes.
🔊
Audio Input
No. Not a speech product.
🖌️
Canvas / Artifact Editor
No. Code + LangSmith traces, not a consumer canvas.
🖥️
Screen Sharing / Computer Use
No. No computer-use desktop product.

🧠 Memory & Context

🧠
Persistent Memory
Yes, requires free plan. Own your harness, context, and memory. LangGraph is built for persistent state.
📏
Large Context Window
Unknown. Depends on the model you choose. No LangChain token window.
⚙️
Custom Instructions
Yes, requires free plan. Prompts, graphs, and Fleet natural-language agent specs.
📜
Conversation History
Yes, requires plus plan. LangSmith traces and datasets persist agent runs.

🔌 Integrations

🌐
Web Search / Browsing
Partial. You add a search tool. Not a built-in cited search box.
🔌
Plugins / Extensions
Yes, requires free plan. Model providers, tools, and 30+ Agent Server endpoints.
🔧
API Access
Yes, requires free plan. OSS libraries plus LangSmith / Agent Server APIs.
⚡
Zapier Integration
Unknown. No first-party Zapier listing was checked.
🤖
Custom GPTs / Bots
Yes, requires free plan. You build agents (Fleet in NL, or code) and deploy them.
👥
Real-time Collaboration
Partial. Teams share LangSmith. Not a multiplayer chat canvas.
🐦
Live Social Data Integration
No. No live social firehose product.
📚
Live Citation Mapping
No. Not a cited-search product.

👨‍💻 Developer

🛠️
Function Calling
Yes, requires free plan. Tool calling is the framework. Human approval for sensitive actions on LangSmith.
⚡
Streaming Responses
Yes, requires free plan. Streaming tokens is standard in the Python/JS APIs.
🎛️
Fine-Tuning
No. You pick models. LangChain does not train weights.
📐
Embeddings API
Partial. Embedding integrations exist in the OSS stack. LangChain is not an embeddings vendor.
📋
Structured Output (JSON)
Yes, requires free plan. Structured output parsers / tool args are a core pattern.
🧩
Reasoning / Thinking Mode
Partial. Deep Agents for long-running work. That is agent loops, not a user Deep Think toggle.
🏠
Local Execution
Yes, requires free plan. Open-source frameworks run locally. LangSmith cloud is optional.
🔓
Open Weights
Partial. Framework is OSS (350M+ monthly downloads). You bring any model, including open weights.
🤖
Multi-Agent Orchestration
Yes, requires free plan. LangGraph / Deep Agents for multi-step and multi-actor graphs.

📱 Platforms

🌐
Web App
Yes, requires free plan. langchain.com plus LangSmith web console.
📱
iOS App
No. No iOS app.
🤖
Android App
No. No Android app.
🖥️
Desktop App
No. No branded desktop app.
🔵
Chrome Extension
No. No Chrome extension.

🔒 Privacy

🔒
GDPR Compliant
Unknown. SaaS vs self-host. A DPA was not read this round.
🚫
Opt Out of Data Training
Partial. Self-host / BYOC keeps data on your infra. SaaS training policy was not checked.
🏢
Enterprise Privacy Mode
Yes, requires enterprise plan. Govern: LLM Gateway, spend limits, sensitive-data detection. Deploy SaaS, BYOC, or self-hosted. 5 of Fortune 10.

💼 Workspaces

📂
Projects / Folders
Yes, requires plus plan. LangSmith projects, datasets, and deployments.