LettavsDevin

Full side-by-side comparison — features, pricing, platforms, and which one wins in 2026.

Letta

AI Agent Frameworks

Build stateful AI agents with long-term memory

Full review →Website ↗

Devin

Coding Assistants

Featured

Autonomous AI software engineer by Cognition

Full review →Website ↗
FeatureLettaDevin
CategoryAI Agent FrameworksCoding Assistants
PricingFree (open-source) + Cloud$500/mo
GitHub Stars
✓ More stars
13k
—
PlatformsLinux, macOS, DockerWeb
Key Features
  • ✓ Long-term memory
  • ✓ Stateful agents
  • ✓ Tool use
  • ✓ Multi-model
  • ✓ Self-editing memory
  • ✓ Autonomous coding
  • ✓ Bug fixing
  • ✓ Deployment
  • ✓ Learning from docs
  • ✓ Multi-step planning
Pros
  • + Solves long-term memory problem
  • + Self-editing memory
  • + Stateful agents
  • + Multi-model support
  • + Active research backing
  • + Fully autonomous coding agent
  • + Own development environment
  • + Can handle end-to-end tasks
  • + Learns from documentation
  • + Impressive demo results
Cons
  • − Complex memory management
  • − Performance overhead
  • − Rebranding confusion
  • − Still experimental
  • − $500/mo price point
  • − Closed-source
  • − Real-world performance varies
  • − Limited availability
Tags
memorystatefulagentsopen-source
autonomouscodingagentsoftware-engineer

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