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What is LangChain?

LangChain is a versatile framework that simplifies the process of building, deploying, and managing LLM-based applications, offering developers a suite of powerful tools for creating reasoning-driven systems. The platform includes LangGraph for creating sophisticated agent-driven workflows and LangSmith for ensuring real-time visibility and optimization of AI agents. With LangChain, developers can integrate their own data and APIs into their applications, making them more dynamic and context-aware. It also provides fault-tolerant scalability for enterprise-level applications, ensuring that systems remain responsive under heavy traffic. LangChain’s modular nature allows it to be used in a variety of scenarios, from prototyping new ideas to scaling production-ready LLM applications, making it a valuable tool for businesses across industries.

What is 21st?

21st is a developer-focused platform designed to simplify the creation and deployment of AI agents within modern software applications. The platform provides an SDK that allows developers to define agents using simple code while integrating tools, prompts, and AI models. It supports multiple development environments and frameworks including Next.js, React, TypeScript, Python, Node.js, and other common programming stacks. Developers can configure agents to run on advanced runtimes such as Claude Code or Codex, enabling tool usage, file access, and intelligent task execution. Once the agent configuration is defined, deployment can be completed using a single command that automatically sets up infrastructure. The platform manages backend systems such as sandboxed execution environments, authentication, rate limits, and streaming responses. It also includes a drop-in chat interface component that developers can embed directly into their applications to enable user interaction with agents. Real-time token streaming allows users to see responses generated progressively, creating a more interactive experience. The platform provides built-in observability tools that allow developers to monitor conversations, replay sessions, and trace agent actions. These features make debugging and optimization much easier during development and production. 21st also includes usage controls such as per-user spending limits, quotas, and metering to help manage AI costs. By combining powerful developer tools with managed infrastructure and deployment capabilities, 21st makes it easier for teams to build and scale AI-powered agents within their products.

Media

Media

Integrations Supported

Arato.ai
Barndoor.ai
BrowserQL
Cognee
CrateDB
Fluq
Galileo
HumanLayer
Hyperbrowser
JetStream Security
Kodosumi
Langtrace
Playwright
Runbear
ScrapeGraphAI
Serper
SmartProxy
TheDevStarter
Unity Catalog
WebScrapingAPI

Integrations Supported

Arato.ai
Barndoor.ai
BrowserQL
Cognee
CrateDB
Fluq
Galileo
HumanLayer
Hyperbrowser
JetStream Security
Kodosumi
Langtrace
Playwright
Runbear
ScrapeGraphAI
Serper
SmartProxy
TheDevStarter
Unity Catalog
WebScrapingAPI

API Availability

Has API

API Availability

Has API

Pricing Information

Pricing not provided.
Free Trial Offered?
Free Version

Pricing Information

Free
Free Trial Offered?
Free Version

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

LangChain

Date Founded

2022

Company Location

United States

Company Website

www.langchain.com

Company Facts

Organization Name

21st.dev

Company Website

21st.dev/

Categories and Features

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