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Haystack vs Letta

Side-by-side comparison of Haystack and Letta: pricing, features, API access, and community ratings.

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Haystack
Haystack

The open-source AI framework for production-ready agents, RAG & context engineering

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Letta
Letta

An AI research lab building self-improving agents that remember everything and learn continuously.

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Category
Agent frameworks
Agent frameworks
Pricing
Freemium
Freemium
Starting price
Free tier
Audience
Technical
All audiences
API available
Open source
Self-hostable
Model provider
Agnostic (OpenAI, Anthropic, Mistral, Hugging Face, and more)
Founded
2023
Headquarters
Berlin, Germany
San Francisco, USA
Key strengths
  • ·Modular, composable pipeline architecture with full transparency and debuggability
  • ·Vendor-agnostic integrations across LLMs, vector stores, and data sources
  • ·Production-ready with Kubernetes support, serializable pipelines, and cloud-agnostic deployment
  • ·Supports advanced RAG, agentic workflows, multimodal AI, and conversational AI
  • ·Persistent, evolving agent memory and identity
  • ·Continual learning — agents improve over time without retraining
  • ·Git-based memory versioning for reproducible context management
  • ·Sleep-time compute for offline reasoning during idle periods
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