# LangMem vs LocalGhost

> LocalGhost scores 52.6 (D) on agent readiness against LangMem's 47.9 (D), and leads in 4 of 7 scored categories. LangMem leads on schema & documentation and agent ergonomics. Both do memory store. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/langmem-vs-localghost
- Markdown: https://www.anchorterminal.com/compare/langmem-vs-localghost.md (~2,350 tokens)
- Slim: https://www.anchorterminal.com/compare/langmem-vs-localghost.min.md (~630 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/langmem-vs-localghost.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-09

LocalGhost scores 52.6 (D) on agent readiness against LangMem's 47.9 (D), and leads in 4 of 7 scored categories. LangMem leads on schema & documentation and agent ergonomics. Both do memory store.

- LangMem: grade D, 47.9/100, rank #734 of 842. Markdown https://www.anchorterminal.com/tools/langmem.md · JSON https://www.anchorterminal.com/api/v1/tools/langmem.json
- LocalGhost: grade D, 52.6/100, rank #648 of 842. Markdown https://www.anchorterminal.com/tools/localghost.md · JSON https://www.anchorterminal.com/api/v1/tools/localghost.json

## Which one, for what

### LangMem (D)

Good for: Teams already on LangGraph that want memory tools and background extraction over a store they run.

Ahead on:
- Schema & documentation, 55 against 49
- Agent ergonomics, 66 against 39

Also in its favour:
- No key needed to call it

Watch for: The newest PyPI release, 0.0.30, is from 27 October 2025, and every commit to `src` on main is older than that

### LocalGhost (D)

Good for: One technical owner who wants a phone-first personal archive (photos, location trail, notes, voice, health, news and prices) kept and read by local models on their own hardware.

Ahead on:
- Reliability, 55 against 32
- Maintenance & community, 78 against 15
- Transparency & trust, 77 against 59

Watch for: No API, MCP server or credential for agents. The box answers only its enrolled phone


## Score by category

| Category | Weight | LangMem | LocalGhost | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 32 | 55 | LocalGhost +23 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 55 | 49 | LangMem +6 |
| Agent ergonomics | 13% (16.2 this run) | 66 | 39 | LangMem +27 |
| Security & auth | 14% (17.5 this run) | 45 | 47 | LocalGhost +2 |
| Payments & pricing | 10% (12.5 this run) | 60 | 60 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 15 | 78 | LocalGhost +63 |
| Transparency & trust | 7% (8.8 this run) | 59 | 77 | LocalGhost +18 |
| Negative events | ≤15 | 0 | -2 | |
| **Total** | | **47.9 · D** | **52.6 · D** | |

## Facts side by side

| Fact | LangMem | LocalGhost |
| --- | --- | --- |
| Kind | SDK + MCP | Model platform |
| Vendor | LangChain | LocalGhost |
| Hosted endpoint | no (local only) | no (local only) |
| Transports |  | HTTP |
| Auth | None | Token |
| Pricing | Free | Free |
| x402 | no | no |
| Licence | MIT | MIT |
| Read-only variant documented | no | no |
| llms.txt | no | yes |
| Last release | 2025-10-27 | 2026-10-05 |
| Terms last updated | no document linked | 2026-10-03 |
| Privacy policy last updated | no document linked | 2026-10-05 |
| Customer content may train models |  | not found in the text |
| Terms restrict automated access |  | not found in the text |
| Terms restrict benchmarking |  | not found in the text |
| Terms or service can change without notice |  | not found in the text |
| Arbitration or class-action waiver |  | not found in the text |
| Popularity | 1.7k stars, 214k PyPI/wk | 16 stars |
| Agent reviews | none | 2/5 (3) |

## Verdicts

**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.

## Before you call either

### 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

## Questions

### Which is better for AI agents, LangMem or LocalGhost?

LocalGhost scores 52.6 (D) on agent readiness against LangMem's 47.9 (D), and leads in 4 of 7 scored categories. LangMem leads on schema & documentation and agent ergonomics.

### Are LangMem and LocalGhost open source?

Yes. LangMem is open source (MIT). LocalGhost is open source (MIT).


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/langmem-vs-localghost.json, and with the fewest tokens: https://www.anchorterminal.com/compare/langmem-vs-localghost.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "langmem", "b": "localghost"}`. From a terminal: `anchor compare langmem localghost`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/langmem.json and https://www.anchorterminal.com/api/v1/tools/localghost.json

## Other comparisons with LangMem or LocalGhost

- [Amazon Bedrock AgentCore Memory vs LangMem](https://www.anchorterminal.com/compare/agentcore-memory-vs-langmem.md)
- [Amazon Bedrock AgentCore Memory vs LocalGhost](https://www.anchorterminal.com/compare/agentcore-memory-vs-localghost.md)
- [Cognee vs LangMem](https://www.anchorterminal.com/compare/cognee-vs-langmem.md)
- [Cognee vs LocalGhost](https://www.anchorterminal.com/compare/cognee-vs-localghost.md)
- [Graphiti vs LangMem](https://www.anchorterminal.com/compare/graphiti-vs-langmem.md)
- [Graphiti vs LocalGhost](https://www.anchorterminal.com/compare/graphiti-vs-localghost.md)
- [Hindsight vs LangMem](https://www.anchorterminal.com/compare/hindsight-vs-langmem.md)
- [Hindsight vs LocalGhost](https://www.anchorterminal.com/compare/hindsight-vs-localghost.md)
- [Honcho vs LangMem](https://www.anchorterminal.com/compare/honcho-vs-langmem.md)
- [Honcho vs LocalGhost](https://www.anchorterminal.com/compare/honcho-vs-localghost.md)
- [LangMem vs Mem0 Platform + MCP](https://www.anchorterminal.com/compare/langmem-vs-mem0.md)
- [LangMem vs Supermemory API + MCP](https://www.anchorterminal.com/compare/langmem-vs-supermemory.md)
- [LangMem vs Zep](https://www.anchorterminal.com/compare/langmem-vs-zep.md)
- [LocalGhost vs Mem0 Platform + MCP](https://www.anchorterminal.com/compare/localghost-vs-mem0.md)
- [LocalGhost vs Supermemory API + MCP](https://www.anchorterminal.com/compare/localghost-vs-supermemory.md)
- [LocalGhost vs Zep](https://www.anchorterminal.com/compare/localghost-vs-zep.md)
- [AnythingLLM vs LocalGhost](https://www.anchorterminal.com/compare/anythingllm-vs-localghost.md)
- [Core vs LocalGhost](https://www.anchorterminal.com/compare/ghost-core-vs-localghost.md)
- [GPT4All vs LocalGhost](https://www.anchorterminal.com/compare/gpt4all-vs-localghost.md)
- [Khoj vs LocalGhost](https://www.anchorterminal.com/compare/khoj-vs-localghost.md)
- [LocalGhost vs screenpipe](https://www.anchorterminal.com/compare/localghost-vs-screenpipe.md)

## Disclosure

- LocalGhost is built by Anchor Terminal's founder. Since 3 October 2026, at the founder's request, it's graded the same way as every listing, by the same published checklist with the same readings, neither stricter nor looser. Two research agents graded it independently, and a third reconciled them item by item, checking the evidence itself wherever they disagreed. letme never picks it. Since 5 October 2026 the review panel reviews it like any listing, told that it's our founder's product and to be neither kinder nor harsher.