Letta vs Zep
Detailed side-by-side comparison to help you choose the right tool
Letta
🔴DeveloperAI Agent Framework
Framework and cloud service for building stateful AI agents that remember, learn continuously, and improve over time — the successor to MemGPT.
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Starting Price
FreeZep
🔴DeveloperAgent memory
Zep provides agent memory capabilities for teams building and operating AI applications. It supports the MCP ecosystem.
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Starting Price
FreeFeature Comparison
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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
Zep - Pros & Cons
Pros
- ✓tracks when facts change
- ✓ingestion-centered pricing suits read-heavy agents
- ✓several SDK and deployment options
Cons
- ✗credit consumption needs real payload testing
- ✗free allowance is small
- ✗webhooks and analytics require a higher tier
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