# Mem vs Zep: which AI memory layer for agents in 2026?

**Source:** https://promtable.com/compare/mem-vs-zep

> Zep is the production memory layer purpose-built for AI agents — temporal facts, knowledge graph, embeddings. Mem is the personal AI-native note app with automated linking. Different jobs.

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Zep is the production memory layer purpose-built for AI agents — temporal facts, knowledge graph, embeddings. Mem is the personal AI-native note app with automated linking. Different jobs.

## At a glance

| Dimension | Zep | Mem |
|---|---|---|
| Primary use | Agent memory layer | Personal AI notes |
| Temporal fact extraction | **First class** ✓ | Limited |
| Knowledge graph for agents | **First class (Graphiti)** ✓ | No |
| Personal note UX | No — backend memory layer | **First class** ✓ |
| API ergonomics | **Production-grade for agents** ✓ | Personal app API |
| Pricing | Per-seat / per-mem-op | $10-15/month consumer |
| Best for | Agent memory backend | Personal AI note-taking |

## Verdict

Zep is the right pick when you're building an AI agent or assistant that needs production-grade memory — temporal facts, knowledge graph, retrieval over user history. Mem is the right pick when you're a personal user who wants AI-native note-taking with automated linking and recall. They don't compete — different audiences.

## When to pick which

- **Zep** — Building an AI agent or assistant with memory needs.
- **Mem** — Personal AI-native note-taking and recall.

## FAQ

### Zep or Mem for an AI assistant?

Zep — purpose-built agent memory layer with temporal facts and knowledge graph.

### Best personal AI note app?

Mem — automated linking and recall.

### Open source alternatives to Zep?

Zep itself has open-source variants (Graphiti); Letta (formerly MemGPT) is another OSS choice.

## Related

- [/glossary/stateful-agent](https://promtable.com/glossary/stateful-agent)
- [/glossary/context-distillation](https://promtable.com/glossary/context-distillation)
- [/alternatives/notion-ai](https://promtable.com/alternatives/notion-ai)

*Last updated: 2026-06-01*
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Original page: https://promtable.com/compare/mem-vs-zep
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