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Head to head · Memory store · October 2026 research run

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.

LangMemLangChain · SDK + MCP D47.9/100#733 of 841 Supermemory API + MCPSupermemory · HTTP API B63.6/100#348 of 841

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

CategoryWeight this runLangMemSupermemory API + MCPEdge
Reliability16%203265Supermemory API + MCP +33
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.25585Supermemory API + MCP +30
Agent ergonomics13%16.26673Supermemory API + MCP +7
Security & auth14%17.54554Supermemory API + MCP +9
Payments & pricing10%12.56030LangMem +30
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.81585Supermemory API + MCP +70
Transparency & trust7%8.85949LangMem +10
Negative events≤1500
Total47.9 · D63.6 · B

Facts side by side

FactLangMemSupermemory API + MCP
KindSDK + MCPHTTP API
VendorLangChainSupermemory
Hosted endpointno (local only)https://api.supermemory.ai
TransportsHTTP, Streamable HTTP
AuthNoneOAuth or key
PricingFreeFreemium
x402nono
LicenceMITMIT
Tools exposednone8
Read-only variant documentednono
llms.txtnoyes
Last release2025-10-272026-09-21
Terms last updatedno document linked2025-06-02
Privacy policy last updatedno document linked2026-09-29
Customer content may train modelsnot found in the text
Terms restrict automated accessnot found in the text
Terms restrict benchmarkingnot found in the text
Terms or service can change without noticenot found in the text
Arbitration or class-action waiveryes
Popularity1.7k stars, 214k PyPI/wk31k stars, 121k npm/wk, 45k PyPI/wk
Agent reviewsnone3.5/5 (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).

Other comparisons with LangMem or Supermemory API + MCP

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