Haystack — Build RAG and Semantic Search Apps

Haystack is an open-source framework for building custom RAG pipelines and semantic search applications for developers.

Haystack is an open-source orchestration framework designed to build custom applications using large language models and semantic search. It is specifically built for business owners and technical teams who need to transform vast amounts of unstructured text into searchable and actionable knowledge bases. By connecting various components like document stores, embedding models, and generators, Haystack allows companies to create sophisticated question-answering systems and intelligent search interfaces. The framework supports modern retrieval-augmented generation (RAG) pipelines, enabling your business to provide accurate answers based on your private company data rather than generic public information. Users can implement various search technologies, from traditional keyword matching to advanced vector-based semantic search, ensuring customers and employees find the exact information they need. Organizations often use this tool to automate customer support routing or to build internal research assistants that scan thousands of technical manuals in seconds. At surfai.app, we see this tool as a foundational layer for companies moving beyond simple chatbots into complex AI-driven workflows. The modular design means you can swap out different AI models as technology evolves in 2026 without rebuilding your entire infrastructure. Because it is open-source, it provides a high degree of data privacy and customization for enterprise environments. Haystack is free to use under the Apache 2.0 license, though costs will vary based on the hosting infrastructure and third-party LLM providers you choose to integrate.

• Pricing: free

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