Letta

Platform for stateful agents with long-term memory

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About Letta

Letta is a platform, formerly MemGPT, for building agents that maintain state and learn from long-term memory. Day to day, memory blocks, archival storage and a REST API let agents persist context across sessions and improve over time. For teams moving agents from prototype to production, that focus on reliability and visibility matters more than adding another layer of fragile automation.

Letta key facts

Category: AI Agents
Pricing: Freemium — a free tier lets you start, and paid plans are available if you need more.
Focus areas: memory, stateful agents, platform
Official site: letta.com

About the AI Agents category

Autonomous AI agents that plan and execute tasks for you — general agents, AI browsers, AI employees, app builders, and coding agents. The AI Agents category on Tools Hub currently lists 156 tools. Alongside Letta, it includes Mem0, Zep, Cognee, Langfuse.

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More in AI Agents

Comparing tools in the AI Agents category? These related listings are worth a look: Mem0 — Memory layer for AI agents and applications; Zep — Context engineering platform for agent memory; Cognee — Open-source memory engine for AI agents.