Letta vs Mem0

Detailed side-by-side comparison to help you choose the right tool

Letta

🔴Developer

Agent Framework

Stateful agent framework and cloud from the MemGPT team — agents that actually remember across sessions.

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Starting Price

Free
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Mem0

🔴Developer

Agent Memory

Persistent memory infrastructure that lets AI applications add, update, and retrieve useful context across sessions.

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Starting Price

$0/month
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Feature Comparison

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FeatureLettaMem0
CategoryAgent FrameworkAgent Memory
Pricing Plans3 listed plans4 listed plans
Starting PriceFree$0/month
Key Features
  • • Persistent agents instead of stateless chat sessions
  • • Memory palace for viewing an agent’s memory
  • • Background memory agents / dream agents that refine prompts, context, and skills over time
  • • Persistent user and agent memory across sessions
  • • Add, update, and filtered search through Python and Node.js SDKs
  • • Memory Compression Engine for compact context retrieval

💡 Our Take

Choose Letta if you need a full stateful-agent runtime with memory blocks, tools, API deployment, coding-agent workflows, and agent portability. Choose Mem0 if you mainly need a memory layer to plug into an existing agent stack.

Letta - Pros & Cons

Pros

  • ✓Persistent, editable memory is built into the agent runtime
  • ✓ADE exposes agent state and tool calls for debugging
  • ✓Python, TypeScript, REST, multiple model providers, and MCP offer flexible integration
  • ✓Open-source self-hosting avoids mandatory platform lock-in

Cons

  • ✗Stateful agents add privacy, retention, deletion, and migration responsibilities
  • ✗Cloud plan and model usage can create separate cost layers
  • ✗Memory quality still depends on prompts, models, and application-specific evaluation

Mem0 - Pros & Cons

Pros

  • ✓Focused add-and-search API can be integrated without building a complete memory pipeline.
  • ✓Published request limits make cloud capacity and cost easier to estimate.
  • ✓Free and $19 tiers support prototypes before a larger production commitment.
  • ✓Enterprise offers on-premises deployment, audit logs, SSO, and SLA support.

Cons

  • ✗The jump from $19 Starter to $249 Pro is substantial for teams needing graph memory or multiple projects.
  • ✗Persistent memory creates privacy, consent, retention, and deletion obligations.
  • ✗Retrieval quality and cross-user isolation must be tested on the buyer's own data.
  • ✗Mem0 adds a stateful production dependency alongside the model provider and application database.

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🔒 Security & Compliance Comparison

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Security FeatureLettaMem0
SOC2——
GDPR——
HIPAA——
SSO——
Self-Hosted🔀 Hybrid✅ Yes
On-Prem✅ Yes✅ Yes
RBAC——
Audit Log——
Open Source✅ Yes✅ Yes
API Key Auth✅ Yes✅ Yes
Encryption at Rest——
Encryption in Transit✅ Yes—
Data Residencynot publicly documented—
Data RetentionconfigurableConfigurable by deployment and application design
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Ready to Choose?

Read the full reviews to make an informed decision

Review LettaReview Mem0