Letta vs Goose (by Block)

Detailed side-by-side comparison to help you choose the right tool

Letta

🔴Developer

AI Agents

Stateful AI agent platform from the MemGPT team, providing long-term memory, tools, and a managed runtime for production agents.

Was this helpful?

Starting Price

Free
Full ReviewVisit Site

Goose (by Block)

🔴Developer

AI Agents

Open-source, extensible AI agent from Block that runs on your machine and orchestrates LLMs, MCP tools, and developer workflows.

Was this helpful?

Starting Price

Custom
Full ReviewVisit Site

Feature Comparison

Scroll horizontally to compare details.

FeatureLettaGoose (by Block)
CategoryAI AgentsAI Agents
Pricing Plans327 tiers6 tiers
Starting PriceFree
Key Features
  • • Persistent agents instead of stateless chat sessions
  • • Memory palace for viewing an agent’s memory
  • • Background memory agents / dream agents that refine prompts, context, and skills over time

    Letta - Pros & Cons

    Pros

    • ✓Built by the team that invented MemGPT-style stateful memory
    • ✓Memory blocks are inspectable and editable — no black-box embeddings vault
    • ✓Model-agnostic: switch between Claude, GPT, Gemini, and local Ollama freely
    • ✓MCP support layers Letta's memory on top of the broader tool ecosystem
    • ✓Generous Free tier for prototyping stateful agents

    Cons

    • ✗Memory editing adds tokens to every turn — costs grow on long sessions
    • ✗Dashboard debugging is less mature than dedicated tracing tools
    • ✗Hosted runtime locks you into Letta's data model unless you self-host
    • ✗Memory tuning still benefits from periodic human-curated summaries

    Goose (by Block) - Pros & Cons

    Pros

    • ✓Open source and free under Apache 2.0 — no vendor lock-in
    • ✓MCP-native: the entire MCP server ecosystem is available out of the box
    • ✓Bring-your-own LLM, including local models like Ollama for cost control
    • ✓Approval flows let you inspect every tool call before it runs
    • ✓Backed by a real product company (Block) rather than a one-person side project

    Cons

    • ✗Setup is config-driven — not a one-click consumer experience
    • ✗Desktop UI is less polished than Cursor or Claude Desktop
    • ✗No managed cloud option for non-developer teammates
    • ✗You're responsible for picking model + tool combos and managing safety

    Not sure which to pick?

    🎯 Take our quiz →

    🔒 Security & Compliance Comparison

    Scroll horizontally to compare details.

    Security FeatureLettaGoose (by Block)
    SOC2——
    GDPR——
    HIPAA——
    SSO——
    Self-Hosted🔀 Hybrid—
    On-Prem✅ Yes—
    RBAC——
    Audit Log——
    Open Source✅ Yes—
    API Key Auth✅ Yes—
    Encryption at Rest——
    Encryption in Transit✅ Yes—
    Data Residencynot publicly documented—
    Data Retentionconfigurable—
    🦞

    New to AI tools?

    Read practical guides for choosing and using AI tools

    Read Guides →
    🔔

    Price Drop Alerts

    Get notified when AI tools lower their prices

    Tracking 2 tools

    We only email when prices actually change. No spam, ever.

    Get weekly AI agent tool insights

    Comparisons, new tool launches, and expert recommendations delivered to your inbox.

    No spam. Unsubscribe anytime.

    Ready to Choose?

    Read the full reviews to make an informed decision

    Review LettaReview Goose (by Block)