Letta
A command-line AI agent from the Letta research lab whose memory and capabilities build up with use.
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About Letta
Letta is a San Francisco AI research lab that grew out of the MemGPT work on virtual context management for language models. Its research ships as Letta Agent, installed from npm as the letta-code package, which keeps a lasting memory and identity across sessions.
The lab publishes work on agent memory, including git-based context repositories, sleep-time compute that lets agents reason during idle time, and continual learning in token space. It suits developers who want an agent that retains what it has learned between sessions.
Strengths
- Persistent memory that carries over between sessions
- Installs with a single npm command
- Backed by published research on agent memory
Limitations
- Homepage gives few details on pricing or licensing
- Aimed at developers comfortable with the command line
Details
- Pricing
- FreemiumThe agent installs from npm; the homepage does not detail pricing.
- License
- Proprietary
- Developer
- Letta
- Platforms
- Command line
- How it runs
- Downloadable app
- Best suited for
- Developers who want an agent that remembers context over time
- Last verified
- Added
- Sources
Alternatives to Letta
Compare allSoftware that can replace Letta for an important use case, and what changes if you switch.
gptme
An open-source AI agent for the terminal that writes code, runs shell commands and browses the web.
Gptme is an open-source terminal agent that runs shell commands, edits files and browses the web, but persistent memory is not listed among its features.
Goose
Run an extensible AI assistant on your desktop or in a terminal.
Goose is Apache-2.0 open source, runs on desktop or terminal, and connects models to tools through MCP extensions, without a memory focus.
Agent Zero
A self-hosted personal AI agent framework that uses the computer as a tool and runs in Docker.
Agent Zero is a self-hosted personal agent running in Docker with a web interface and plugins, instead of an npm-installed CLI.
OpenManus
A general-purpose AI agent written in Python, built as an open alternative to Manus.
OpenManus is a Python general-purpose agent supporting MCP and multi-agent flows, run from the command line or in Docker.
Similar software
Related functionality, not necessarily a direct replacement.
Mem
An AI note-taking workspace with an agent that tracks your tasks, projects and goals from your notes.
Screenpipe
Records your screen and audio continuously on your own computer so AI agents can search it.
Fabric
A command-line tool for running a crowdsourced library of reusable AI prompts against language models.
AutoGPT
A platform for building, deploying and running autonomous AI agents, which you can host yourself.
Gemini CLI
Google's open source AI agent for the terminal, powered by Gemini.
