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Letta vs Hermes Desktop: catalog facts
Letta	Hermes Desktop
Freemium The agent installs from npm; the homepage does not detail pricing.	Free Free and open source under the MIT licence.
Command line	Windows, macOS, Linux
Persistent memory that carries over between sessions Installs with a single npm command	Keeps memory across sessions Writes and improves its own skills
Homepage gives few details on pricing or licensing Aimed at developers comfortable with the command line	Linux has no installer package and installs through the terminal Autonomous agents need care with the access they are given
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MIT
Not stated if an account is 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 October 1, 2026

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