AgentIndex icon
AgentIndex
letta logo
letta
★ 25.2k
vs
celiums-memory logo
celiums-memory
★ 23

letta vs celiums-memory

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.; celiums-memory: Celiums Memory is a cognitive memory engine designed to be embedded within other software like agents and assistants, providing persistent memory, journaling, and an auditable ethics engine. It speaks the Model Context Protocol (MCP) to offer these advanced cognitive capabilities without requiring developers to build them from scratch.

01

TL;DR

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 →
celiums-memory logo
celiums-memoryMemory & Context · ★ 23

Embedding into AI agents and assistants to provide persistent memory and context

Read celiums-memory full review →
02

Side-by-Side Comparison

Field
letta logoletta
celiums-memory logoceliums-memory
Category
Memory & Context
Memory & Context
Stars
★ 25.2k
★ 23
License
Apache-2.0
Apache-2.0
Install Command
npm install -g @letta-ai/letta-code
git clone https://github.com/terrizoaguimor/celiums-memory.git && cd celiums-memory && cp .env.example .env && pnpm docker:up
Updated
5d ago
2mo ago
Open Source
Yes
Yes
Website
↗ Visit
↗ Visit
GitHub
↗ GitHub
↗ GitHub
Tags
Stateful AI, Agent Platform, Advanced Memory
Cognitive Memory Engine, Agent Memory, Journaling
03

Features

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
celiums-memory logoceliums-memory
01Cognitive Memory with Hybrid Retrieval (vector + full-text + affective/PAD resonance)
02Append-Only Hash-Chained First-Person Agent Journal
03Auditable 4-Layer Ethics Engine for moral evaluation
04Per-User Biological Clock modulating arousal and recall
05Flexible Storage Adapters (SQLite for local/embedded, Postgres+Qdrant+Valkey for clustered)
04

Use Cases

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.
celiums-memory logoceliums-memory
↳Embedding into AI agents and assistants to provide persistent memory and context
↳Implementing auditable ethical guidance and decision-making for AI systems
↳Developing applications requiring first-person journaling and causal chain tracking for agents
↳Building scalable knowledge bases with hybrid retrieval capabilities for AI applications
↳Integrating advanced cognitive functions into any MCP-compatible client or custom software
05

Best For

letta logoletta
Most PopularEssentialTrending
celiums-memory logoceliums-memory
—
FAQ

FAQ

What is the difference between letta and celiums-memory?
Both letta and celiums-memory are in the Memory & Context category. letta has 25.2k stars, while celiums-memory has 23 stars.
Which is better, letta or celiums-memory?
The best choice depends on your use case. Choose letta if Running AI agents locally in your terminal for coding and general tasks., and celiums-memory if Embedding into AI agents and assistants to provide persistent memory and context.
Is letta free or open source?
Yes, letta is open source on GitHub (Apache-2.0).
Is celiums-memory free or open source?
Yes, celiums-memory is open source on GitHub (Apache-2.0).
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