AI Agent Platforms / All platforms / Letta
Letta
Framework and server for building stateful agents with persistent memory that learn over time.
Letta is a platform for building agents that keep memory across conversations and improve over time. It runs as a server that can be self-hosted or used through Letta Cloud, which stores agent memory, identity, and conversation history. Developers use it through a terminal UI, desktop apps, a web interface, and a TypeScript SDK.
| Category | Agent builders and frameworks |
| License | Apache-2.0 |
| Hosting | self-hosted server; vendor-hosted available |
| Repository | github.com/letta-ai/letta |
| Website | docs.letta.com |
| Last verified | 2026-09-02 |
Documented features
- Gives agents persistent memory that carries across conversations
- Runs as a local or self-hosted app server
- Provides a terminal UI, desktop apps for macOS, Windows, and Linux, and a web interface
- Connects agents to channels such as Slack, Telegram, and Discord
- Offers a TypeScript Agent SDK for embedding agents in applications
- Letta Cloud maintains agent memory, identity, and history across devices
- Installable via npm as @letta-ai/letta-code
Feature summaries come from the project's own repository and documentation and describe the software as documented on the verification date, not an evaluation.