AI Agents Freemium

Letta

Stateful agents with persistent memory and continual learning

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PricingFreemium
Starting price$20/mo
Free planYes
Free trialYes
APIYes
Open sourceYes
DeploymentHybrid
Last verifiedAugust 3, 2026
Overview

Tool overview

Letta is listed under AI Agents AI tools.

Summary

What is Letta?

Letta provides an open-source agent harness, local apps, SDKs, and a managed API for agents that preserve memory, identity, skills, and experience across long-running work.

Best fit

Best for

Developers building agents that remember and improve over time

Audience

Who is it for?

Agent developersAI application teamsCoding-agent usersEnterprise AI platforms
Recommendation

Decision note

Rebuilt from the original export under the complete V412/V411 factual-source-verification workflow. Preview only. Apply remains blocked until Failures = 0, Warnings = 0, Unmapped = 0, Missing = 0; explicit clears are reviewed; image import is disabled; a representative WordPress edit screen is compared with the export and proposed row; and a post-Apply zero-change Preview succeeds.

Capabilities

Key features

Persistent memory and identity across sessions

Letta Code desktop, CLI, and SDK

Managed stateful-agent API and self-hosted server

Skills, schedules, channels, MCP, and remote computers

Workflows

Use cases

Build personal coding agents

Embed persistent agents in applications

Create AI coworkers in Slack or messaging channels

Automate recurring long-running work

Strengths

Pros

  • Free personal use with BYOK or coding plans
  • Apache-2.0 open-source harness
  • Managed cloud and complete self-hosting options
Considerations

Cons

  • Managed API adds monthly and usage charges
  • Memory and continual-learning behavior need evaluation
  • Enterprise controls require custom plans
Considerations

Limitations

Persistent memory can retain sensitive context and requires deletion and access controls.

Agent autonomy, tools, and schedules need least privilege and human oversight.

Cost

Pricing details

Pricing modelFreemium
Starting price$20/mo
Free planYes
Free trialYes
Pricing context

Billing options

Free personal useMonthly API plan plus usageEnterprise contract
Pricing context

Pricing note

Letta Code can be used free with existing API keys or coding plans. The Letta API Plan is $20/month, plus $0.10 per active agent monthly, $0.00015 per second of server tool execution, and model usage.

View official pricing
Compatibility

Supported languages

  • English
Connectivity

Integrations

OpenAI

Anthropic

Gemini

Codex

Slack

Discord

Telegram

WhatsApp

MCP

GitHub Actions

Specs

Technical details

PlatformsDesktop, Web, API
Multilingual supportUnknown
Login requiredYes
Open sourceYes
LicenseApache-2.0
DeploymentHybrid
CompanyLetta Inc.
Launch year2024
Current version0.16.7
Models / versionsLetta Agent Letta Code Letta API
Editions / plansLetta Code Letta API Plan Enterprise Open-source server
Data confidenceHigh
Last verifiedAugust 3, 2026
Documentation → Source code → Release notes → Data source →
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Answers

Frequently asked questions

Letta provides an open-source agent harness, local apps, SDKs, and a managed API for agents that preserve memory, identity, skills, and experience across long-running work.
Developers building agents that remember and improve over time
The listed pricing model for Letta is Freemium. Pricing can change, so users should verify the latest plan details on the official website.
Yes. The current profile indicates that a free trial is available.
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