Letta
Letta: A framework for persistent-memory agents, with cloud and self-hosted deployment options. Ranked #39 of 49 in LLM Application Development Frameworks by our editors (5.5/10); pricing: Free plan · paid from $20/mo; best for teams building persistent-memory agents and assistants.
At a glance
- Editor score5.5 / 10
- PricingFree plan · paid from $20/mo
- Best forTeams building persistent-memory agents and assistants
- Free planYes
- Paid from$20/mo
- Facts checked25 Sep 2026
Where it wins
- Stateful agents retain memory and support continual learning.
- Embed agents through the SDK or REST API, or run a self-hosted App Server.
- Share agents with teammates and connect Slack, Telegram, Discord or custom channels.
Where it doesn't
- The Free plan limits agents and Letta Auto usage.
- Pro supports up to 20 stateful agents; unlimited agents are on the API Plan.
- The listed $20 monthly plans have distinct quotas and usage charges to weigh.
Our verdict on Letta
Letta is a platform for building stateful AI agents that retain memory and improve with use. It is aimed at teams creating coding agents, personal assistants, AI coworkers, or recurring-task automation, as well as developers embedding agents into applications. The product combines an app, CLI, desktop clients, browser access, an Agent SDK, and a REST API. Its emphasis is agent runtime and persistent memory rather than general workflow tooling, making it a fit for teams whose applications depend on agents that carry context forward.
The deployment and integration choices suit both application builders and teams that want to operate the app server themselves. Letta offers cloud hosting and a self-hostable App Server, supports selectable model providers and Letta Auto routes, and lists Windows, macOS, Linux, web, API, and self-hosted platforms. Slack, Telegram, Discord, and custom channels provide paths for connecting agents to communication tools. Shared agents, permissions, reusable skills, and schedules add collaboration and recurring-prompt capabilities. This breadth is useful when agents need to live in an app, channel, or team environment, though the product's defining focus remains persistent-memory agents rather than workflow orchestration.
The published monthly plans start with Free, which has limited agents and Letta Auto usage and allows users to bring their own API keys and external coding plans. Pro is $20 per month, adds Letta Auto weekly and monthly quota, pay-as-you-go overage, and up to 20 stateful agents. The $20 API Plan has unlimited agents and API-key authentication, with pay-as-you-go LLM usage. Teams Pro is $20 per seat per month and adds organization teammates, agent sharing, and access control. Enterprise pricing is volume-based and includes increased quotas, role-based access control, SAML/OIDC SSO, and dedicated support. Choose Letta for persistent-memory agent applications; teams primarily seeking broader workflow tooling may prefer another framework.
Letta pricing
All 5 Letta plans and prices →
Letta fact sheet
| Free plan | Yes |
|---|---|
| Paid from | $20/mo |
| Primary language | Not verified |
| RAG support | Not verified |
| Agent and tool use | Not verified |
| Workflow graphs | Not verified |
| Prompt optimization | Not verified |
| Open-source license | Not verified |
| JavaScript/TypeScript SDK | Not verified |
| Deployment | Cloud, Self-hosted, Desktop |
| Platforms | Web, Windows, macOS, Linux |
| Compliance & security | SSO/SAML |
| Support | Email, Community, Docs |
| Built for | Solo, Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 4 integrations: Slack, Telegram, Discord, custom channels |
| Pricing | Free plan · paid from $20/mo (source) |
| Website | letta.com |
| Facts checked | 25 Sep 2026 |
Letta integrations
Letta lists 4 integrations on its own site.
- Slack
- Telegram
- Discord
- custom channels
Alternatives to Letta
- LangChainA self-hosted framework for LLM apps, retrieval workflows, and agents.9.4
- LangGraphGraph-based control for developers who need durable, stateful agent workflows.9.2
- Microsoft Agent FrameworkAn open-source framework for multi-agent orchestration, with checkpoints and approval gates.9.1
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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