Cognee vs Letta

Side-by-side comparison of two AI agent tools

Short answer

  • Cognee is growing faster: +2,637 GitHub stars in the last 30 days vs +513 for Letta.
  • Pick Cognee for: knowledge Engine for AI Agent Memory in 6 lines of code. 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.

Cogneeopen-source

Knowledge Engine for AI Agent Memory in 6 lines of code

Lettaopen-source

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

Metrics

CogneeLetta
Stars31.3k25.0k
Star velocity /mo2.6k512.8571428571429
Commits (90d)2.4k7
Releases (6m)101
Overall score0.91589755430714960.5869394693270381

Pros

  • +极简 API 设计，仅需 6 行代码即可集成知识引擎功能
  • +专注于 AI Agent 内存管理，提供个性化和动态的知识存储能力
  • +活跃的开源社区支持，拥有插件生态系统和多语言文档
  • +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

  • -作为相对较新的工具，可能在企业级应用中缺乏充分的生产验证
  • -专门针对 AI Agent 场景设计，对于通用知识管理需求可能过于专业化
  • -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

  • •构建具有长期记忆能力的聊天机器人和虚拟助手
  • •开发能够学习用户偏好和历史交互的个性化 AI Agent
  • •实现多会话间的知识共享和上下文保持的企业 AI 应用
  • •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 Cognee DetailsView Letta Details

FAQ

Which is more popular, Cognee or Letta?
Cognee has more GitHub stars (31,301 vs 25,005).
Which is more actively developed, Cognee or Letta?
Cognee had more commits in the last 90 days (2,427 vs 7).
Should I use Cognee 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.
Cognee vs Letta (2026): GitHub Stats, Features & Which to Choose