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Letta vs OpenManus: catalog facts
Letta	OpenManus
Freemium The agent installs from npm; the homepage does not detail pricing.	Free Free to download and run; you supply your own model API access.
Command line	Self-hosted, Command line
Persistent memory that carries over between sessions Installs with a single npm command	Open alternative to the Manus agent Supports MCP and multi-agent flows
Homepage gives few details on pricing or licensing Aimed at developers comfortable with the command line	Command-line setup with Python and configuration files Needs a language model API to work
Downloadable app	Downloadable app, Self-hosted
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	No account 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.