LangChain Alternatives
7 Tools Like LangChain
Quick answer: Top LangChain alternatives include LlamaIndex, Haystack and Semantic Kernel. For open source, look at LlamaIndex and Haystack.
LangChain is a framework for building applications and agents on top of LLMs.
Developers look for LangChain alternatives for simpler abstractions, better RAG tooling, or a framework in their own language.
- 7 alternatives
- 7 open source
The best LangChain alternatives
#1LlamaIndex
llamaindex.ai
Framework for connecting LLMs to your data and building agents.
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In LlamaIndex’s own words: “LlamaParse is the world's best agentic OCR for processing complex documents with messy tables, charts, images, and more with human-level accuracy.”
LlamaIndex is open source.
People switching from LangChain often consider LlamaIndex.
#2Haystack
haystack.deepset.ai
Open-source framework for production RAG and LLM pipelines.
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In Haystack’s own words: “Create agentic, context engineered AI systems using Haystack’s modular and customizable building blocks, built for real-world, production-ready applications.”
Haystack is open source.
People switching from LangChain often consider Haystack.
#3Semantic Kernel
github.com
Microsoft’s open-source SDK for building AI agents in C#, Python and Java.
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In Semantic Kernel’s own words: “Integrate cutting-edge LLM technology quickly and easily into your apps - microsoft/semantic-kernel”
Semantic Kernel is open source.
People switching from LangChain often consider Semantic Kernel.
#4DSPy
dspy.ai
Stanford’s framework for programming — not prompting — language models.
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In DSPy’s own words: “The framework for programming—rather than prompting—language models.”
DSPy is open source.
People switching from LangChain often consider DSPy.
#5CrewAI
crewai.com
Framework for orchestrating teams of collaborating AI agents.
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CrewAI is open source.
People switching from LangChain often consider CrewAI.
#6Vercel AI SDK
ai-sdk.dev
TypeScript toolkit for building AI apps and agents.
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In Vercel AI SDK’s own words: “A unified TypeScript SDK for building AI apps with modern streaming, fallbacks, and multi-model support—powered by Vercel.”
Vercel AI SDK is open source.
People switching from LangChain often consider Vercel AI SDK.
#7Mastra
mastra.ai
TypeScript framework for AI agents, workflows and RAG.
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In Mastra’s own words: “Ship AI agents that reason, remember, and act in TypeScript. Mastra provides memory, tools, MCP, and observability to go from prototype to production.”
Mastra is open source.
People switching from LangChain often consider Mastra.
Listed for information; LaunchStall isn’t affiliated with these companies. Features and plans change — check each site for current details.
How these LangChain alternatives compare
| Tool | Best for | Where it beats LangChain | The trade-off |
|---|---|---|---|
| LlamaIndex | Apps that answer from your own data | Focused on retrieval, indexing and document pipelines. | Less general outside data-focused apps. |
| Haystack | Production search and RAG pipelines | Clear, explicit pipelines designed for production. | A smaller community and fewer integrations. |
| Semantic Kernel | .NET and Microsoft teams | First-class C# support and Azure integration. | Less natural outside the Microsoft stack. |
| DSPy | Researchers who want to optimise prompts | Treats prompts as programs and optimises them automatically. | A different way of thinking that takes time to learn. |
| CrewAI | Multi-agent workflows | A simple way to define agents with roles and tasks. | Less control over fine-grained behaviour. |
| Vercel AI SDK | TypeScript apps and chat interfaces | Great streaming and UI helpers for React and Next.js. | Focused on TypeScript and less on complex data pipelines. |
| Mastra | TypeScript agent apps | Agents, workflows and memory designed for TypeScript. | Younger, with a smaller ecosystem. |
Which should you choose?
- Your app answers from documents: LlamaIndex
- You build web apps in TypeScript: Vercel AI SDK or Mastra
- You work in C#: Semantic Kernel
- You want several agents working together: CrewAI
Our editorial summary of each tool’s focus, written November 2026. Tools change quickly, so check the details on each site.
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Frequently asked questions
What are the best LangChain alternatives?
Popular LangChain alternatives include LlamaIndex, Haystack and Semantic Kernel. The best choice depends on whether you need a free plan, open-source software or specific features.
Is there an open-source alternative to LangChain?
Yes — LlamaIndex, Haystack, Semantic Kernel and DSPy are open source.
Why do people look for LangChain alternatives?
Developers look for LangChain alternatives for simpler abstractions, better RAG tooling, or a framework in their own language.
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