AgentIndex icon
AgentIndex
claude-soul logo
claude-soul
★ 92
vs
letta logo
letta
★ 25.2k

claude-soul vs letta

claude-soul: Claude Soul gives Claude Code persistent memory across sessions, automatically tracks user corrections with lifecycle stages, and develops improved behavioral frameworks over time. It runs entirely locally using SQLite, integrates via MCP server and hooks, and requires no cloud or API keys.; letta: Letta is a powerful platform for building stateful AI agents equipped with advanced memory, enabling them to learn and self-improve over time. It provides both a command-line interface for local agent execution and a comprehensive API with Python and TypeScript SDKs for seamless integration into applications.

01

TL;DR

claude-soul logo
claude-soulMemory & Context · ★ 92

Maintain context and recall previous decisions across Claude Code sessions

Read claude-soul full review →
letta logo
lettaMemory & Context · ★ 25.2k
When to choose:
  • You want a long-lived agent that remembers past work and rewrites its own memory and context over time.
  • You want one agent reachable from CLI, desktop, browser, mobile and messaging apps, with subagents, schedules and hooks.
  • You want memory you can inspect: the README says context is tracked in git and can sync to your own repository.
When to skip:
  • You only need to add memory to an agent you already use through MCP; a small MCP memory server is a lighter fit.
  • You rely on older Letta tutorials or the V1 API server: the project restructured, and the V1 server is retired.
  • You want everything to work without signing in: Letta Cloud is the default backend and some features need it.
Read letta full review →
02

Side-by-Side Comparison

Field
claude-soul logoclaude-soul
letta logoletta
Category
Memory & Context
Memory & Context
Stars
★ 92
★ 25.2k
License
MIT
Apache-2.0
Install Command
npx claude-soul init --starter
npm install -g @letta-ai/letta-code
Updated
4mo ago
5d ago
Open Source
Yes
Yes
Website
↗ Visit
↗ Visit
GitHub
↗ GitHub
↗ GitHub
Tags
ai, ai-agent, claude
Stateful AI, Agent Platform, Advanced Memory
03

Features

claude-soul logoclaude-soul
01Cross-session memory with semantic search (local SQLite + optional Ollama embeddings)
02Automatic correction tracking with lifecycle stages (new → active → improving → internalized)
03Self-evolving judgment and framework optimization through reflection cycles
04Shadow analysis CLI to inspect behavioral patterns with trends
05Fully local, no cloud, no API key, no telemetry
letta logoletta
01Build stateful AI agents with advanced memory
02Agents capable of learning and self-improvement over time
03CLI tool for running agents locally in your terminal
04Comprehensive API for integrating agents into applications
05Support for skills and subagents; fully model-agnostic
04

Use Cases

claude-soul logoclaude-soul
↳Maintain context and recall previous decisions across Claude Code sessions
↳Track and internalize corrections to improve Claude's behavior over time
↳Allow Claude to autonomously develop and refine working frameworks based on repeated successful patterns
letta logoletta
↳Running AI agents locally in your terminal for coding and general tasks.
↳Integrating stateful AI agents into custom applications using the API and SDKs.
↳Developing self-improving AI systems that adapt and learn continually.
05

Best For

claude-soul logoclaude-soul
—
letta logoletta
Most PopularEssentialTrending
FAQ

FAQ

What is the difference between claude-soul and letta?
Both claude-soul and letta are in the Memory & Context category. claude-soul has 92 stars, while letta has 25.2k stars.
Which is better, claude-soul or letta?
The best choice depends on your use case. Choose claude-soul if Maintain context and recall previous decisions across Claude Code sessions, and letta if Running AI agents locally in your terminal for coding and general tasks..
Is claude-soul free or open source?
Yes, claude-soul is open source on GitHub (MIT).
Is letta free or open source?
Yes, letta is open source on GitHub (Apache-2.0).
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