Letta
Free tierAn AI research lab building self-improving agents that remember everything and learn continuously.
Free tier available·All audiences·API available·Open source
Key strengths
Stateful agents with persistent memoryContinual learning and self-improvementOpen-source (Apache 2.0)Self-hostableGit-based memory versioningSleep-time compute / background reasoningMulti-channel integrations (Slack, Discord, WhatsApp, etc.)
Free tier + paid plans
San Francisco, USA
Founded 2023
Self-hostable
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Technical Use Cases
Letta is purpose-built for scenarios where agent statefulness, memory persistence, and continual learning are first-class requirements:
- Long-horizon task agents — build agents that track multi-step workflows across days or weeks, using persistent memory to maintain task state without re-prompting
- Personalized developer tooling — integrate with Cursor or GitHub to create coding assistants that remember project conventions, past decisions, and team preferences
- Multi-channel support bots — deploy a single stateful agent across Slack, Discord, and WhatsApp simultaneously, with shared memory across channels
- Background reasoning pipelines — leverage sleep-time compute to have agents pre-process data, summarize updates, or prepare responses during idle periods
- Memory-versioned agent systems — use git-based memory versioning to audit, diff, and roll back agent memory states in production
- Multi-agent architectures — compose agents using MCP and ACP protocols for tool use and inter-agent communication
- Self-hosted enterprise deployments — run Letta entirely on private infrastructure under Apache 2.0, with BYOK for LLM API costs and custom Enterprise SLAs
Alternatives
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