ZeroDB vs Letta — Which Memory Layer for AI Agents?
Letta (formerly MemGPT) is an agent framework with built-in memory. ZeroDB is pure knowledge infrastructure — no framework required, no server to run, no lock-in.
| Feature | ZeroDB | Letta |
|---|---|---|
| Persistent Agent Memory | ✓ | ✓ |
| Vector / Semantic Search | ✓ | ✓ |
| NoSQL Document Storage | ✓ | ✗ |
| SQL / Relational Tables | ✓ | ✗ |
| File Storage (S3-compatible) | ✓ | ✗ |
| Event Streaming | ✓ | ✗ |
| Built-in Free Embeddings | ✓ | ✗ |
| MCP Server Integration | ✓ | ✗ |
| Knowledge Graph + Entity Relationships | ✓ | ✗ |
| Self-Hosted Option | ✓ | ✓ |
| Works Without a Separate Server Process | ✓ | ✗ |
| Framework-Agnostic API | ✓ | ✗ |
| LangChain Integration | ✓ | ✗ |
| LlamaIndex Integration | ✓ | ✗ |
| Serverless Functions (Python/JS/WASM) | ✓ | ✗ |
| Event-triggered hooks (auto-embed, auto-graph) | ✓ | ✗ |
| Zero-Auth Instant Provisioning | ✓ | ✗ |
| Enterprise / Multi-Tenant Support | ✓ | ✗ |
| Agent Framework Lock-In Required | ✗ | ✓ |
| 3-Day Trial | ✓ | ✓ |
Why teams choose ZeroDB over Letta
No separate server required
Letta (MemGPT) requires running a dedicated stateful server process alongside your agent. ZeroDB is a managed API — call it from any language, any framework, without provisioning or managing additional infrastructure.
Vector search plus full NoSQL in one platform
Letta focuses on in-context memory management using a custom agent architecture. ZeroDB gives you semantic vector search AND NoSQL document storage AND relational tables — all queryable from the same connection string.
No agent framework lock-in
Letta ships its own agent framework. If you're building with LangChain, LlamaIndex, raw OpenAI calls, or a custom stack, ZeroDB integrates without replacing your existing architecture. It's a database, not an agent runtime.
Production-ready enterprise features
ZeroDB includes multi-tenant isolation, role-based access, audit logging, and SLA-backed uptime. Enterprise teams get full data sovereignty with the self-hosted option — no compromises on compliance.
Memory infrastructure that works with any agent framework
No new agent runtime. No server to manage. Just a fast, persistent knowledge layer via API or MCP.
Get started: npx zerodb-cli init
