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Haystack

Apache-2.0 framework for context-engineered, production RAG and agent pipelines

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What Haystack does

  • Apache-2.0 framework for context-engineered, production RAG and agent pipelines
  • Modular components with retrievers, generators and tool calling
  • Integrates most vector stores and model providers

Haystack — straight answers

What is Haystack?

Haystack is listed under Agent Frameworks (Developers), in the AI Agents & Automation category on Flocci AI Tools. Apache-2.0 framework for context-engineered, production RAG and agent pipelines. It is free, with no paid plan attached, and it lives at haystack.deepset.ai.

Is Haystack free?

Haystack is listed as fully free — there is no paid tier attached to it in the catalog. That makes it one of the 399 entries on Flocci AI Tools with no upgrade path built in.

What can Haystack do?

Haystack does 3 things the catalog singles out: Apache-2.0 framework for context-engineered, production rag and agent pipelines; modular components with retrievers, generators and tool calling; integrates most vector stores and model providers.

What is the best free alternative to Haystack?

Agno is the closest free alternative: it sits in the same Agent Frameworks (Developers) sub-category and is free. AWS Strands Agents, CAMEL and Claude Agent SDK also start free. The full list is on the alternatives page.

See the full list →

Haystack alternatives

Compare all alternatives →

LangGraph

Agent Frameworks (Developers)
free
  • Build stateful, multi-agent apps as graphs
  • Human-in-the-loop and durable execution
  • Works with any LLM
  • Open-source with a hosted platform
Visit

CrewAI

Agent Frameworks (Developers)
freemium
  • Role-based multi-agent 'crews'
  • Simple Python API for collaboration
  • Tasks, tools and flows
  • Open-source core
Visit

OpenAI Agents SDK

Agent Frameworks (Developers)
free
  • Lightweight agent orchestration from OpenAI
  • Agent handoffs, guardrails and tracing
  • Tool and function calling built in
  • Open-source, pay only for model usage
Visit

Microsoft AutoGen

Agent Frameworks (Developers)
free
  • Multi-agent conversation framework
  • Event-driven, async agent design
  • Studio UI for prototyping
  • Fully open-source
Visit

LlamaIndex

Agent Frameworks (Developers)
freemium
  • Leading framework for RAG and data agents
  • Connect LLMs to your documents & APIs
  • Agentic document workflows
  • Open-source with a hosted cloud
Visit

Google Agent Development Kit (ADK)

Agent Frameworks (Developers)
free
  • Open-source Python/Java framework from Google for building multi-agent systems
  • Native integration with Vertex AI Agent Engine and Gemini models
  • Model-agnostic — works with non-Google LLMs via LiteLLM
Visit

Head-to-head comparisons

Haystack vs LangGraphHaystack vs CrewAIHaystack vs OpenAI Agents SDKHaystack vs Microsoft AutoGenHaystack vs LlamaIndexHaystack vs Google Agent Development Kit (ADK)