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OpenManus vs Letta: catalog facts
OpenManus	Letta
Free Free to download and run; you supply your own model API access.	Freemium The agent installs from npm; the homepage does not detail pricing.
Self-hosted, Command line	Command line
Open alternative to the Manus agent Supports MCP and multi-agent flows	Persistent memory that carries over between sessions Installs with a single npm command
Command-line setup with Python and configuration files Needs a language model API to work	Homepage gives few details on pricing or licensing Aimed at developers comfortable with the command line
Downloadable app, 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.