Letta

Open-source framework for building AI agents with persistent memory and stateful interactions

Free

Letta (formerly MemGPT) is an open-source framework for building stateful AI agents with persistent memory, enabling agents that remember past interactions, learn from experience, and maintain consistent personas over long conversations. Unlike stateless chatbots that forget context between sessions, Letta agents maintain structured memory including core identity, conversation history, and learned knowledge, updating their memory intelligently as they interact. The framework provides a deployment server, REST API, and management tools for running production agent services with full memory persistence.

Letta at a glance

Category	AI Agents
Pricing	Free
Free plan	Yes
Official site	letta.ai
Last checked	2026-10-23

Letta is an AI-powered AI Agents tool listed on Nextool.ai, a directory of 1,900+ AI tools. Letta is free to use. Browse the AI Agents category on Nextool.ai to compare similar tools, read reviews, and find the best fit for your workflow.

Key Features

Persistent multi-session memory
Structured memory management
Memory update and reflection
REST API deployment
Persona consistency

Use Cases

Long-term AI companions
Personalized learning assistants
Customer relationship agents
Stateful enterprise AI assistants

How to Choose an AI Agents Tool Like Letta

AI Agents tools vary widely in quality and scope. When comparing Letta with alternatives, weigh these factors:

Which apps and tools it integrates with
How much setup and maintenance automations require
Accuracy of summaries and extracted data
Collaboration and permission controls for teams
Data privacy and where your content is processed
Pricing per seat or per automation run

Letta Pricing

Letta is free to use.

Visit Letta →

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Frequently Asked Questions

What is Letta?

Letta is an AI tool listed on Nextool.ai.

Is Letta free?

Letta is free to use.

What can I use Letta for?

Letta is an AI-powered tool in the AI Agents category. Letta is an AI tool listed on Nextool.ai.

What are the best Letta alternatives?

You can find the best Letta alternatives on our Letta alternatives page. Nextool.ai lists AI Agents tools side by side so you can compare features and pricing.

How do I get started with Letta?

To try Letta, visit the Letta website. Letta is free to use. You can also explore alternative AI Agents tools on Nextool.ai to compare options before committing.

What platforms does Letta run on?

Letta is a web-based AI tool. Check the Letta website for the latest platform and device support.

How does Letta compare to other AI Agents tools?

Letta is one of many AI Agents tools listed on Nextool.ai. The best choice depends on output quality, integrations, data privacy and pricing for your use case — compare Letta with its alternatives on Nextool.ai to find the right fit.

Is Letta worth trying?

If you need to automate busywork and get more done in less time, Letta is worth evaluating. It is free to use, so you can weigh it against similar AI Agents tools on Nextool.ai before committing to a paid plan.

Do I need technical skills to use Letta?

Most AI productivity tools, including Letta, are built for non-technical users: you provide an input in plain language and review the AI-generated result. No coding is required to get started, though advanced features may reward experimentation.

Is my data safe with Letta?

Data handling varies between AI Agents tools. Before uploading anything sensitive to Letta, review its privacy policy and terms to understand how your inputs are stored, processed and used — then compare that against the alternatives on Nextool.ai.

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