LangMem vs LocalGhost

LangMem

Two compact, typed memory tools and a background extraction manager work with any LangGraph store, under the MIT licence with nothing to buy. The newest PyPI release, 0.0.30, dates from 27 October 2025. The repository has no changelog, tags or test workflow, and 23 of 54 open issues have no reply.

LocalGhost

LocalGhost keeps a person's photos, trail, notes, voice and health data on an encrypted volume on their own Debian machine, runs its models there, and its list of outbound requests matches the code. It's pre-1.0 at wisp 0.0.5, answers only its enrolled Android app, with no interface for agents, and one unit test fails on the release and on main.

LangMem

1. Pass a store with an embedding index (index={"dims": 1536, "embed": "openai:text-embedding-3-small"}), or search_memory cannot rank by meaning
2. Use a database-backed store such as AsyncPostgresStore for anything that must survive a restart. InMemoryStore loses everything
3. Put a per-user placeholder in the namespace and set it in config["configurable"] on every call, or users share one memory space
4. Send the memory id with update and delete, and never with create. A retried create writes a duplicate under a new UUID
5. Run on Python 3.11 or later. src/langmem/knowledge/extraction.py uses typing.NotRequired, which Python 3.10 lacks

LocalGhost

1. Don't look for an API or MCP server. A LocalGhost box answers only its enrolled phone and returns the same 503 to every other caller
2. Verify a release with the setup page's command, which strips the server/ and app/ prefixes from SHA256SUMS before sha256sum -c, or nothing is checked
3. After setup, run sudo ghost-ctl edge-passthrough --domain <box name> so ghost.secd checks the device certificate itself
4. Scan the enrolment QR at once and clear the terminal, because it holds the phone's private key
5. Install from the v0.0.5 release, not main, which carries unreleased 0.0.6 work