Letta vs MemOS

Side-by-side comparison of two AI agent tools

Short answer

  • Letta is growing faster: +513 GitHub stars in the last 30 days vs +225 for MemOS.
  • Pick Letta for: letta is the platform for building stateful agents: AI with advanced memory that can learn and self-improve. Pick MemOS for: memory OS for LLMs and AI agents with graph-structured, multimodal storage and retrieval.

From GitHub data refreshed daily.

Lettaopen-source

Letta is the platform for building stateful agents: AI with advanced memory that can learn and self-improve over time.

M
MemOSopen-source

Memory OS for LLMs and AI agents with graph-structured, multimodal storage and retrieval

Metrics

LettaMemOS
Stars25.0k11.7k
Star velocity /mo512.8571428571429225
Commits (90d)7261
Releases (6m)110
Overall score0.58693946932703810.7181250897770423

Pros

  • +Advanced persistent memory system that allows agents to learn and improve over time across sessions
  • +Dual deployment options with both local CLI tool and cloud API for different use cases and security requirements
  • +Model-agnostic architecture supporting multiple LLM providers with extensive SDK support for TypeScript and Python

    Cons

    • -Requires Node.js 18+ for CLI usage, which may limit adoption in some environments
    • -API-based functionality requires API keys and cloud dependency for full feature access
    • -As a relatively new platform for stateful agents, may have a learning curve for developers new to persistent memory concepts

      Use Cases

      • •Building coding assistants that remember project context and learn from previous debugging sessions
      • •Creating customer support agents that maintain conversation history and learn customer preferences over time
      • •Developing personal AI assistants that evolve their responses based on user behavior patterns and feedback
        View Letta DetailsView MemOS Details

        FAQ

        Which is more popular, Letta or MemOS?
        Letta has more GitHub stars (25,005 vs 11,675).
        Which is more actively developed, Letta or MemOS?
        MemOS had more commits in the last 90 days (261 vs 7).
        Should I use Letta or MemOS?
        Compare their capabilities, limitations and "best for" notes above. Both are open source, so trying each on a small task is the fastest way to decide.