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Agent Zero vs Letta: catalog facts
Agent Zero	Letta
Free Free to download and run; model API costs depend on the provider you use.	Freemium The agent installs from npm; the homepage does not detail pricing.
Self-hosted	Command line
Runs on your own hardware in Docker Web interface for working with the agent	Persistent memory that carries over between sessions Installs with a single npm command
Requires Docker and some technical setup An agent that runs code needs careful sandboxing	Homepage gives few details on pricing or licensing Aimed at developers comfortable with the command line
Self-hosted	Downloadable app
Closed source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 26, 2026	Official website Full listing and sources Checked September 26, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.