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Agent MemoryUnclaimed

LangMem

A Python library enabling AI agents to build and maintain long-term memory from their interactions

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Also known as
langmem

What is LangMem?

LangMem provides tools for AI agents to extract important information from conversations, maintain long-term memory across sessions, and continuously improve their behavior. It offers native integration with LangGraph and works with any storage backend.

Independently observed

LangMem pricing

We don't have LangMem's full plan breakdown yet (its pricing page resisted automated reading). Here's what we could confirm. Always check live pricing for exact numbers.

Pricing as of verify at live pricing ↗Independently observed
Open sourceFree tier

Free and open source (MIT license)

What LangMem does

The capabilities that matter for agent memory, normalised so it lines up with every alternative. “-” means we haven't confirmed it, not that it's missing.

Capabilities
Architecture model
Open source self hosted
Graph based entity relationship extraction
-
Automatic context window rolling summarization
-
Semantic vs episodic event chronological memory
✓
Cross session and multi thread user persistence
✓
Memory conflict resolution and fact updating
✓
Multi tenant user and agent isolation
-
Native langchain and llamaindex memory classes
✓
Time decay and recency weighted retrieval
-
Zero data retention and pii redaction layer
-
SOC2 type ii
-
Mit or apache permissive oss license
✓
Pricing model
Free open source
Independently observed

Platform & deployment

Independently observed
Platforms
  • CLI
  • Web
Deployment
  • Self-hosted

Integrations (2)

Independently observed
  • LangGraph
  • GitHub (repository hosting)

Security & compliance

Known vulnerabilities: 0 (0 in the last 12 months) sourcea count reflects scale & disclosure, not quality

LangMem FAQ

Common questions about LangMem, answered from independent, dated evidence.

Is LangMem free to use?

LangMem is open source, so it can be self-hosted and used at no licence cost. It is released under the MIT licence. Pricing changes often, so verify at source before relying on it.

Source: https://github.com/pricing

What platforms does LangMem support?

LangMem supports the web and a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.

Source: https://github.com/pricing

Can LangMem be self-hosted?

Yes. LangMem can be deployed self-hosted, so it does not have to run on the vendor's infrastructure.

Source: https://github.com/pricing

Is LangMem open source?

Yes. LangMem is published under the MIT licence, a permissive licence that generally allows commercial use and modification. Licence terms can change between releases, so verify against the repository for the version you intend to use.

Source: https://github.com/langchain-ai/langmem

LangMem alternatives

Other agent memory we track, ranked by the same independent score.

All LangMem alternatives, ranked →

Compare LangMem

Side by side against other agent memory, attribute by attribute, with a source on every value.

Independent · unbought · dated

The vioscaleAI score: one lens on the evidence

Not user reviews and not a paid placement: a confidence-weighted blend of the independent signals below (adoption, activity, security posture, and more), which you can sort and re-weight yourself. Vendors can correct their listing but can never move their rank, and stars are weighted low as a vanity metric. It is one way to read the evidence for LangMem, not the verdict.

Balanced composite 43 / 100
low · 24%
Signal contributions to the composite score
SignalScoreWeightContributionEvidence
Capabilities750.086.0✓
Development activity270.143.6✓
Stars610.052.9✓
Integrations90.050.5✓
Dependent projects00.050.0✓
Release cadence00.080.0-
Security posture00.120.0-
Package downloads00.040.0-
Security score00.050.0-
Developer Q&A activity00.140.0-

Computed . Re-weight it by intent, or see the full method.

All data & sourcesshow ↓

Every value we hold, with its source, retrieval date, and confidence. This is the evidence behind the score: don't trust it, verify it.

Activity

AttributeValueEvidence
Commits last 30d6mediumsource · 2026-09-14 · 65%

Adoption

AttributeValueEvidence
Github stars1,703highsource · 2026-10-14 · 90%
Dependent repos0highsource · 2026-10-14 · 85%

Content

AttributeValueEvidence
Faq4 itemsmediumsource · 2026-09-10 · 69%

Features

AttributeValueEvidence
CapabilitiesPricing model: free_open_source · Architecture model: open_source_self_hosted · Mit or apache permissive oss license: Yes · Memory conflict resolution and fact updating: Yes · Native langchain and llamaindex memory classes: Yes · Cross session and multi thread user persistence: Yesmediumsource · 2026-10-14 · 60%

Integrations

AttributeValueEvidence
Count1mediumsource · 2026-10-14 · 60%

Language

AttributeValueEvidence
PrimaryPythonhighsource · 2026-10-14 · 90%

License

AttributeValueEvidence
SpdxMIThighsource · 2026-10-14 · 95%

Pricing

AttributeValueEvidence
Modelopen_sourcemediumsource · 2026-10-14 · 60%
Free tierYesmediumsource · 2026-10-14 · 60%
Price levelfreemediumsource · 2026-10-14 · 60%
TransparentYesmediumsource · 2026-09-14 · 60%

Security

AttributeValueEvidence
VulnerabilitiesCount: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=pypi&package_name=langmem&per_page=100 · Last 12m: 0highsource · 2026-10-14 · 90%
Trust centerhttps://github.com/securitymediumsource · 2026-10-14 · 60%
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Last updated . Canonical URI: https://www.vioscale.ai/software/langmem.