kitio.aiAdded Oct 28, 2026
Letta
Freemium · $20/moPlatform for stateful AI agents with long-term memory
What is Letta?
Letta is a platform and open-source framework for building agents that keep long-term memory across sessions. It grew out of the MemGPT research project and serves developers building persistent assistants.
Agents store memory in editable blocks and a memory graph, so they learn about users and tasks over time. Developers use the Agent SDK, API or CLI, and an Agent Development Environment shows memory and tool calls in real time. Agents can run on Letta Cloud or a self-hosted backend, and agents can be exported, imported and deleted. You can bring your own model keys.
Features
- Persistent agent memory
- Agent SDK and API
- Agent Development Environment
- Cloud or self-hosted
- Agent export and import
Tags
Releases
+ Submit new release- Listed
Letta was added to the directory.
Organization
Letta
🇺🇸 United States
Listed by kitio.ai · unverified owner
Pricing
- Pricing model
- Freemium
- Paid options from
- $20/mo
- Billing frequency
- Monthly
Letta plans
Free
Free
- Limited stateful agents
- 5 MiB storage per memory repo
- Bring your own API keys
Pro
$20/mo
- Up to 20 stateful agents
- Letta Auto weekly + monthly quota
- 50 MiB storage per memory repo
Teams Pro
$20/mo
- Per seat
- Share agents with access control
- All Pro features
API Plan
$0.10 / active agent / mo
- Unlimited agents
- $0.00015 per sec tool execution
- Pay-as-you-go LLM usage
Enterprise
Contact sales
- Role-based access control
- SAML/OIDC SSO
- Dedicated support
Prices in USD, checked Oct 28, 2026. Plans change often, so confirm on the Letta site.Official pricing
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Pros and cons
Pros
- Strong long-term memory design
- Open-source core
- Clear view of agent state
Cons
- Developer-focused
- Free plan limited to a few agents
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Q&A
What is Letta?
Letta is a platform and open-source framework for building agents that keep long-term memory across sessions. It grew out of the MemGPT research project and serves developers building persistent assistants.
How much does Letta cost?
Letta is freemium, with paid plans from $20/mo.
Is there a free version of Letta?
Yes. Letta has a free plan, and paid plans add more usage and features.
What are the main features of Letta?
Persistent agent memory, Agent SDK and API, Agent Development Environment, Cloud or self-hosted, Agent export and import.
Who makes Letta?
Letta is made by Letta.
What are the best alternatives to Letta?
Popular alternatives include OpenAI Agents SDK, LangGraph, Hermes Agent.