3 Open Source Alternatives to Langchain

A list of 3 carefully selected open-source alternatives to Langchain.

Created by

Adrian

Mar 9, 2025Updated•4 min read

The open-source alternatives are ranked based on our custom ranking system and score. This system takes into account various factors to determine the best alternatives.

If you’re looking for alternative features or workflows, here is a prepared detailed list of Langchain open-source alternatives — each with its own distinctive strengths and key features.

CopilotKit

17,265

2,474

CopilotKit delivers a robust React-based UI and infrastructure tailored for integrating AI copilots, chatbots, and in-app AI agents into your product. It empowers developers to build virtual colleagues that truly understand applications and user needs.

Key Features

React-based customizable UI components for AI copilots
Customizable hooks for chat interactions, suggestions, and generative UI
Real-time, user-specific context integration
CoAgents integration via LangChain and LangGraph
Built-in guardrails for safe and predictable AI actions
Open-source framework encouraging developer collaboration

CopilotKit is an open-source platform designed to seamlessly integrate AI copilots into your applications. Utilizing customizable components such as CopilotChat, CopilotPopup, and AI-enabled text editing, it enables developers to add conversational interfaces, actionable suggestions, and generative UI elements. The platform grounds interactions in real-time, user-specific context and supports dynamic actions. Advanced features include CoAgents integration via LangChain and LangGraph, safe guardrails, and flexible UI customization, making it a comprehensive solution for innovative app development.

Learn more about CopilotKit

Lunary

1,208

148

Lunary is a comprehensive production toolkit for LLMs that enables teams to manage, monitor, and improve chatbot interactions. By offering real-time analytics, prompt management, and error tracing, Lunary streamlines the development and deployment of intelligent conversational agents.

Key Features

Real-time monitoring and analytics of chatbot interactions
Integrated prompt management with templates and collaboration tools
Comprehensive agent tracing and error debugging
Multi-modal support for text, audio, and images
High security standards including SOC 2 and ISO 27001 certifications, plus PII masking
Flexible integration with various LLM frameworks and SDKs

Lunary empowers GenAI teams to advance their LLM chatbots with real-time observability, detailed analytics, and integrated prompt management. The tool provides one-line integration with popular LLM frameworks, supports self-hosting, and delivers features like chat replays, agent tracing, and multi-modal evaluations to enhance performance and user satisfaction.

Learn more about Lunary

Letta

15,187

1,596

Letta (formerly MemGPT) is a powerful framework for creating LLM services with built-in memory and stateful agents. It enables developers to build AI agents with infinite context and human-like memory, facilitating continuous learning and improvement over time.

Key Features

Stateful agents with built-in, persistent memory
Agent Development Environment (ADE) for real-time visualization and editing
Infinite context support to avoid context window overflow
Robust API and SDK integrations (Python, Node.js/TypeScript)
Scalable deployment options with Docker and Kubernetes

Letta empowers users to design and deploy AI agents that maintain persistent memory and reasoning across sessions. The platform integrates an Agent Development Environment (ADE) offering a visual interface to iterate on prompts, tools, and model configurations in real time. With robust APIs, SDKs, and production-ready deployment options, Letta supports over 7,000 tools and ensures agents operate within optimized context windows to enhance performance.

Learn more about Letta

Price comparison of Langchain open-source alternatives

Tool	Tier 1	Tier 2	Tier 3	Details
Lunary	$0 Free	$20 Team	- Enterprise	Learn more

* Pricing shown is based on publicly available information and may not reflect current rates. Visit each tool's website for detailed pricing information and additional tiers.

About Langchain

LangChain is a leading brand that offers a range of products and services to power your applications with Large Language Models (LLMs). With LangChain's flexible abstractions and extensive toolkit, developers can easily harness the immense power of LLMs. Whether you're a tinkerer, startup, research lab, or global corporation, LangChain is the go-to platform for building applications at any scale and for any use-case. LangChain enables you to analyze structured data, provide Q&A over documents, automate workflows, perform sentiment analysis and classification, create personal assistants, and much more. With LangChain, you can easily personalize your applications by connecting to any source of knowledge or data, thanks to their document loaders, callbacks, vector stores, and toolkits. With a comprehensive open-source library of components, LangChain provides a seamless experience for experimentation and development. You can build with the momentum of the entire AI community and stay on the cutting edge with minimal time and code required. Join LangChain's vibrant community, contribute on Github, and explore their integrations hub. Sign up for their newsletter to stay updated with the latest developments.