Letta vs LangChain

FeatureLettaLangChain
CategoryAI Agent FrameworksAI Agent Frameworks
PricingFree (open-source) + CloudFree + LangSmith paid
GitHub Stars13,00098,000
PlatformsLinux, macOS, DockermacOS, Linux, Windows
Features
  • ✓ Long-term memory
  • ✓ Stateful agents
  • ✓ Tool use
  • ✓ Multi-model
  • ✓ Self-editing memory
  • ✓ Chain composition
  • ✓ RAG pipelines
  • ✓ Agent toolkits
  • ✓ Memory systems
  • ✓ Streaming
  • ✓ Multi-model
  • ✓ LangGraph
Tags
memorystatefulagentsopen-source
open-sourceframeworkpythonjavascriptragchains