hermes-agent vs Letta

Side-by-side comparison of two AI agent tools

Short answer

  • hermes-agent is growing faster: +5,710 GitHub stars in the last 30 days vs +511 for Letta.
  • Pick hermes-agent for: the agent that grows with you. Pick Letta for: letta is the platform for building stateful agents: AI with advanced memory that can learn and self-improve.

From GitHub data refreshed daily.

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hermes-agentopen-source

The agent that grows with you

Lettaopen-source

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

Metrics

hermes-agentLetta
Stars250.9k25.0k
Star velocity /mo5.7k511.2631578947368
Commits (90d)33.4k7
Releases (6m)101
Overall score0.9465511756357280.5606070835576371

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 hermes-agent DetailsView Letta Details

        FAQ

        Which is more popular, hermes-agent or Letta?
        hermes-agent has more GitHub stars (250,877 vs 25,012).
        Which is more actively developed, hermes-agent or Letta?
        hermes-agent had more commits in the last 90 days (33,428 vs 7).
        Should I use hermes-agent or Letta?
        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.