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Reviewed · Updated 2026-06-21

Letta

Open-source platform for building stateful AI agents with persistent memory that learn, adapt, and self-improve over time.

Reviewed by the Conversion Gems editorial team ·
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Pricing
Freemium
Best for
Developers building production AI agents that need long-term memory, continuous learning, and stateful behavior across sessions
Category
AI Agent Builders
The bottom line

A robust platform for developing AI agents with persistent memory and continuous learning capabilities.

7
Our score
7 / 10
Conversion Gems editorial verdict
Free tier available
Features8/10
8 - strong support for stateful agents and persistent memory.
Value7/10
7 - freemium model with scalable options.
Ease of use6/10
6 - steeper learning curve due to stateful agent concepts.
Ecosystem7/10
7 - supports multiple LLM providers and offers SDKs.
Support6/10
6 - evolving platform with active research backing.
What it really is

Letta — an open-source platform for building stateful AI agents with persistent memory.

Our take

Letta, formerly known as MemGPT, offers developers tools to create AI agents that maintain long-term memory and improve autonomously. The platform provides a full agents API, SDKs in Python and TypeScript, and a visual Agent Development Environment (ADE) for building and managing AI agents. It supports both self-hosted and cloud deployments, integrates with multiple LLM providers, and features git-based memory versioning for reproducible agent contexts.

Why we rate it

Letta's open-source nature and support for multiple LLM providers make it a flexible choice for developers.

The catch

Early-stage platform means some features are still evolving.

Best for
Developers building AI agents with long-term memory
AI researchers focusing on stateful agents
Teams requiring flexible deployment options
Not good for
Users seeking a plug-and-play AI solution
Projects with minimal AI requirements
Organizations needing mature, fully-featured platforms
Friction report
Time to value
Moderate: requires understanding of stateful agent concepts.
Scale breakpoint
Power-user workloads can become costly on paid tiers.
Walled garden
Low: open-source core allows for customization and integration.

Frequently Asked Questions

Alternatives

Step up

OpenAI's GPT-4 for more mature AI solutions.

Lighter alternative

Hugging Face Transformers for simpler AI implementations.

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Tags

#ai-agents#developer-tools#memory

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