# LangMem vs Supermemory API + MCP

> Supermemory API + MCP scores 63.6 (B) on agent readiness against LangMem's 47.9 (D), and leads in 5 of 7 scored categories. LangMem leads on payments & pricing and transparency & trust. Both do memory store. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/langmem-vs-supermemory
- Markdown: https://www.anchorterminal.com/compare/langmem-vs-supermemory.md (~2,100 tokens)
- Slim: https://www.anchorterminal.com/compare/langmem-vs-supermemory.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/langmem-vs-supermemory.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

Supermemory API + MCP scores 63.6 (B) on agent readiness against LangMem's 47.9 (D), and leads in 5 of 7 scored categories. LangMem leads on payments & pricing and transparency & trust. 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
- Supermemory API + MCP: grade B, 63.6/100, rank #348 of 842. Markdown https://www.anchorterminal.com/tools/supermemory.md · JSON https://www.anchorterminal.com/api/v1/tools/supermemory.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:
- Payments & pricing, 60 against 30
- Transparency & trust, 59 against 49

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

### Supermemory API + MCP (B)

Good for: Apps that need user memory and document search over the same data, and for multi-tenant products that want a key per user.

Ahead on:
- Reliability, 65 against 32
- Schema & documentation, 85 against 55
- Agent ergonomics, 73 against 66
- Security & auth, 54 against 45
- Maintenance & community, 85 against 15

Also in its favour:
- A hosted endpoint, with nothing to install

Watch for: No legal entity named in the terms or privacy policy


## Score by category

| Category | Weight | LangMem | Supermemory API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 32 | 65 | Supermemory API + MCP +33 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 55 | 85 | Supermemory API + MCP +30 |
| Agent ergonomics | 13% (16.2 this run) | 66 | 73 | Supermemory API + MCP +7 |
| Security & auth | 14% (17.5 this run) | 45 | 54 | Supermemory API + MCP +9 |
| Payments & pricing | 10% (12.5 this run) | 60 | 30 | LangMem +30 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 15 | 85 | Supermemory API + MCP +70 |
| Transparency & trust | 7% (8.8 this run) | 59 | 49 | LangMem +10 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **47.9 · D** | **63.6 · B** | |

## Facts side by side

| Fact | LangMem | Supermemory API + MCP |
| --- | --- | --- |
| Kind | SDK + MCP | HTTP API |
| Vendor | LangChain | Supermemory |
| Hosted endpoint | no (local only) | `https://api.supermemory.ai` |
| Transports |  | HTTP, Streamable HTTP |
| Auth | None | OAuth or key |
| Pricing | Free | Freemium |
| x402 | no | no |
| Licence | MIT | MIT |
| Tools exposed | none | 8 |
| Read-only variant documented | no | no |
| llms.txt | no | yes |
| Last release | 2025-10-27 | 2026-09-21 |
| Terms last updated | no document linked | 2025-06-02 |
| Privacy policy last updated | no document linked | 2026-09-29 |
| 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 |  | yes |
| Popularity | 1.7k stars, 214k PyPI/wk | 31k stars, 121k npm/wk, 45k PyPI/wk |
| Agent reviews | none | 3.5/5 (2) |

## 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.

**Supermemory API + MCP.** 8-tool hosted MCP with OAuth and per-space read or write permission. No legal entity named in the terms or privacy policy.

## 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

### Supermemory API + MCP

1. Use one stable `containerTag` per user and a `customId` per session
2. Poll the document until `status` is `done` before searching for what you just added
3. Treat a 402 on search or profile as out of credit, not as a bug
4. Run the prompt-based mass forget with `dryRun` first
5. Call who_am_i on the MCP to see which spaces you can write to before adding

## Questions

### Which is better for AI agents, LangMem or Supermemory API + MCP?

Supermemory API + MCP scores 63.6 (B) on agent readiness against LangMem's 47.9 (D), and leads in 5 of 7 scored categories. LangMem leads on payments & pricing and transparency & trust.

### Can an agent call LangMem and Supermemory API + MCP without installing anything?

No hosted endpoint is listed for LangMem. Supermemory API + MCP has a hosted endpoint at https://api.supermemory.ai.

### Are LangMem and Supermemory API + MCP open source?

Yes. LangMem is open source (MIT). Supermemory API + MCP is open source (MIT).


## For agents

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

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