Letta vs Retell
LettaAutonomous Agents Platforms
Free / Open SourcePublished price
RetellAI Voice Agents
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Letta | Retell | |
|---|---|---|
| Overview | ||
| Tagline | Making machines that learn | AI Voice Agent Platform for Phone Call Automation |
| Description | Stateful AI agent framework formerly MemGPT, enabling agents with persistent memory and self-editing context for long-running tasks. | Voice AI API for building production phone call agents with low latency. |
| Category | Autonomous Agents Platforms | AI Voice Agents |
| Pricing | ||
| Published price | Free / Open Source | Not available |
| Company | ||
| Founded | 2023 | 2023 |
| Team size | 11-50 employees | 11-50 employees |
| Headquarters | Berkeley, CA | San Francisco, CA |