What is the key difference between Celiums Memory and Ratary?

Celiums Memory belongs to the Knowledge & Memory category with cloud HTTP/SSE execution, while Ratary belongs to the Knowledge & Memory category with local stdio execution.

How do I install Celiums Memory or Ratary in Claude Desktop or Cursor?

Copy the mcpServers JSON configuration snippet provided on this page into your claude_desktop_config.json or ~/.cursor/mcp.json file and restart your AI client.

Are Celiums Memory and Ratary free or paid?

Celiums Memory operates under a Free / Open Source model (API Key required). Ratary operates under a Free / Open Source model (API Key required).

Which MCP server has more tools and community activity?

Celiums Memory lists 6 tools with 2 views and 22 GitHub stars. Ratary lists 6 tools with 2 views and 1 GitHub stars.

Can I use both Celiums Memory and Ratary together in the same MCP host?

Yes! MCP hosts like Claude Desktop, Cursor, Windsurf, Cline, and VS Code support configuring multiple servers under the mcpServers object simultaneously.

How do I install Celiums Memory or Ratary in Claude Desktop, Cursor, or Windsurf?

Both servers follow the standard Model Context Protocol configuration format. Simply copy the JSON block from the configuration section above and paste it into your AI client's mcpServers configuration object (for instance in claude_desktop_config.json or ~/.cursor/mcp.json ), then completely restart or refresh the application.

Are Celiums Memory and Ratary free to use, or do they require API keys?

Celiums Memory is listed under a Free / Open Source model with API Key required . Ratary operates under a Free / Open Source model with API Key required . If environment variables are required (such as API keys), be sure to define them under the env key in your MCP client's configuration file.

Can I run both Celiums Memory and Ratary at the same time in my AI client?

Yes! MCP clients support multi-server orchestration. You can include both celiums-celiums-memory and ontorata-ratary as distinct keys inside the single mcpServers object in your configuration file. Your AI assistant will automatically select and call the appropriate tool from either server during chat sessions.

Which MCP server has higher directory engagement and quality ratings?

On AllMCPs, Celiums Memory has a Quality Score of 56 /100 ( Good ) with 2 views, 0 installs, and 22 GitHub stars. Ratary holds a Quality Score of 48 /100 ( Fair ) with 2 views, 0 installs, and 1 GitHub stars.

Side-by-Side Model Context Protocol Comparison

Celiums Memory vs Ratary

In-depth architectural comparison of the Celiums Memory and Ratary MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

At a Glance & Executive Verdict

Celiums Memory

Knowledge & Memory · Remote HTTP/SSE

Quality: 56/100 (Good) | Auth: API Key required

Ratary

Knowledge & Memory · Local stdio

Quality: 48/100 (Fair) | Auth: API Key required

Verdict Summary: Choose Celiums Memory if you need specialized Knowledge & Memory tools running via a hosted cloud SSE transport. Choose Ratary if your workspace requires Knowledge & Memory integration with local subprocess execution. Both servers can be configured concurrently in your client's mcpServers manifest.

Which MCP Server Should You Choose?

Choose Celiums Memory when:

You need dedicated capabilities in the Knowledge & Memory domain.
You prefer remote streaming HTTP/SSE transport architecture.
Your security boundary fits: API Key required (Free / Open Source).
You have access to required keys: PORT, DATABASE_URL, SQLITE_PATH, QDRANT_URL, VALKEY_URL, CELIUMS_API_KEY, CELIUMS_LLM_API_KEY, KNOWLEDGE_API_URL.
Primary tools included: Hybrid retrieval combining vector, full-text, and affective resonance, Append-only, hash-chained first-person journal, Four-layer open ethics engine with deterministic and probabilistic checks.

Explore Celiums Memory Details

Choose Ratary when:

You need dedicated capabilities in the Knowledge & Memory domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: API Key required (Free / Open Source).
You have access to required keys: .

Feature & Specification Comparison

Specification	Celiums Memory celiums Knowledge & Memory	Ratary ontorata Knowledge & Memory
Summary	Cognitive memory engine with 5,100+ knowledge modules, circadian rhythm awareness, and emotional state tracking (PAD model). Hybrid search (PostgreSQL + Qdrant vectors + Valkey cache), per-user memory isolation, and multi-protocol support (MCP, REST, OpenAI, LangChain, A2A). npx @celiums/memory Website	Persistent coding memory for AI assistants — hybrid search, knowledge graph, token-efficient context. MCP stdio (28 tools), npm @ratary/mcp-server, optional remote Streamable HTTP. Self-host D1, Postgres, MariaDB, or Docker.
Category & Scope

Tools & Capabilities Breakdown

Celiums Memory Tools (6)

Hybrid retrieval combining vector, full-text, and affective resonance

Append-only, hash-chained first-person journal

Four-layer open ethics engine with deterministic and probabilistic checks

Per-user circadian rhythm and biological clock modulation

Supports SQLite or Postgres+Qdrant+Valkey storage adapters

Multi-protocol support: MCP, REST, OpenAI-compatible, LangChain, A2A

Ratary Tools (6)

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

Celiums Memory Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "celiums-celiums-memory": {
      "url": "https://img.shields.io/badge/license-Apache%202.0-blue.svg)](LICENSE"
    }
  }
}

Ratary Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "ontorata-ratary": {
      "command": "npx",
      "args": [
        "-y",
        "@ratary/mcp-server@1.1.3"
      ],
      "env": {
        "AUTH_SECRET": "YOUR_AUTH_SECRET_HERE",
        "DATABASE_URL": "YOUR_DATABASE_URL_HERE",
        "SQL_PROVIDER": "YOUR_SQL_PROVIDER_HERE",
        "CLOUDFLARE_ACCOUNT_ID": "YOUR_CLOUDFLARE_ACCOUNT_ID_HERE",
        "CLOUDFLARE_API_TOKEN": "YOUR_CLOUDFLARE_API_TOKEN_HERE",
        "D1_DATABASE_ID": "YOUR_D1_DATABASE_ID_HERE"
      }
    }
  }
}

Frequently Asked Questions

Celiums Memory is categorized under Knowledge & Memory and uses a remote streaming HTTP/SSE transport. In contrast, Ratary belongs to Knowledge & Memory using local stdio subprocess. Select Celiums Memory when you need capabilities focused on knowledge & memory and Ratary when you require tools for knowledge & memory.

More alternatives to Celiums Memory More alternatives to Ratary Knowledge & Memory category hub