Haystack
Free tierThe open-source AI framework for production-ready agents, RAG & context engineering
Free tier available·Technical·Powered by Agnostic (OpenAI, Anthropic, Mistral, Hugging Face, and more)·API available·Open source
Key strengths
Modular, composable pipeline architecture with full transparency and debuggabilityVendor-agnostic integrations across LLMs, vector stores, and data sourcesProduction-ready with Kubernetes support, serializable pipelines, and cloud-agnostic deploymentSupports advanced RAG, agentic workflows, multimodal AI, and conversational AIStrong open-source community with enterprise support and platform tiers available
Free tier + paid plans
Berlin, Germany
Self-hostable
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- Advanced RAG Pipelines: Implement hybrid retrieval (dense + sparse), re-ranking, self-correction loops, and metadata filtering for high-performance retrieval-augmented generation
- Production AI Agents: Build multi-step agentic workflows with standardized tool calling, branching/looping pipeline graphs, and memory management for complex decision flows
- Multimodal Pipelines: Integrate image processing and audio transcription components alongside text generators in a unified pipeline architecture
- LLM Evaluation & Experimentation: Use the Experiments module to benchmark retrieval strategies, prompt templates, and model configurations in a reproducible way
- Context Engineering: Leverage Jinja-2 prompt templating and composable prompt builders to design precise, dynamic context windows for LLM inputs
- Enterprise Deployment: Serialize pipelines to YAML, deploy on Kubernetes, and integrate with observability stacks — with the Enterprise Platform adding visual design, access controls, and audit logs