ACE3: The First Cognitive OS for AI

The brain behind your AI tools. Memory, intelligence, and identity in one self-hosted platform.

Your AI remembers, thinks, and evolves — across every session, tool, and team member.

The Problem

AI coding agents are amazing, but they're super-talented interns with amnesia.

• They forget your architectural decisions from last week.
• They re-introduce bugs you already fixed.
• They don't know why your codebase is structured this way.

The Solution

ACE3 (Autonomous Context Engine) is the first cognitive OS for AI. Not just memory — it's the brain behind your AI tools. Memory, reasoning, learning, evolving, and identity in one platform. Self-hosted on your infrastructure.

What Makes ACE3 Different

| | ACE3 | Mem0 | Zep | Letta | Cognee | |---|---|---|---|---|---| | Structured memory (10 entity types) | Yes | Basic | No | No | No | | Knowledge graph | Yes | Pro only | Yes | No | Yes | | Autonomous agents (10) | Yes | No | No | Stateful | No | | AI Genome / behavioral DNA | Yes | No | No | No | No | | Passport authentication | Yes | No | No | No | No | | Session intelligence | Yes | No | No | No | No | | MCP-native (77 tools) | Yes | No | No | No | No | | Self-hosted | Yes | Partial | Partial | Yes | Yes | | One-time pricing | £499 lifetime | $249/mo | Custom | $20/mo | €1,970/mo |

Quick Start

1. Install

npm install -g @ace3-memory/ace

2. Run

ace login    # Opens browser — auto-configures MCP for Claude Code
ace start    # Server runs on localhost:7777

Already installed? Run ace login again to auto-create the MCP config. This adds ACE tools to Claude Code across all your projects.

3. Use

# Check server is running
ace status

# Store a decision via REST API
curl -X POST http://localhost:7777/api/v1/my-project/decisions \
  -H "Authorization: Bearer $ACE_JWT_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"decision": "Use PostgreSQL", "rationale": "Vector extensions + ACID"}'

# Or let your AI use ACE tools directly via MCP
# (Claude Code, Cursor, etc. call ace_remember, ace_recall, ace_search automatically)

4. Update

# Update ACE to the latest version
npm install -g @ace3-memory/ace

# Or check for updates via CLI
ace update

Architecture

[ Your Machine ]
   |
   +-- [ ACE Server ] (localhost:7777)
   |      |
   |      +-- [ Your PostgreSQL ] (Neon, local, AWS, etc.)
   |
   +-- [ AI Tools ] (Claude, ChatGPT, Cursor) --> queries ACE via REST/MCP
   |
   +-- [ Dashboard ] (ace3-ai.com) --> visualize & manage memory

You provide: The database (PostgreSQL) and infrastructure. We provide: The intelligence, dashboard, and tools.

Features

AI Provider Support (10 Providers)

• OpenAI (GPT-4, GPT-4o, GPT-3.5)
• Anthropic (Claude 3.5, Claude 3)
• Google (Gemini Pro, Gemini Ultra)
• xAI (Grok)
• DeepSeek (DeepSeek-V2)
• Chinese Providers: Baidu Wenxin, Alibaba Qwen, Zhipu ChatGLM, Moonshot Kimi, MiniMax

Multi-Language Support

• English (100% coverage)
• Chinese (92% coverage) - Full support for Asia-Pacific market

| Feature | Description | |---------|-------------| | 10 Entity Types | Memories, decisions, issues, work logs, architecture, patterns, best practices, observations, tags, relationships | | Knowledge Graph | 15 relationship types with temporal traversal, graph analytics, and visualization | | Semantic Search | OpenAI embeddings + pgvector for intelligent recall | | Plans | Save and track implementation plans from any CLI AI (Claude Code, Cursor, ChatGPT) | | Observer | AI that monitors your AI for errors, drift, contradictions | | Agentic Intelligence | 10 autonomous agents (observe/reason/act/reflect) that govern and improve memory | | MCP Server | 77 tools for Claude Desktop, Claude Code, Cursor, VS Code, ChatGPT, Gemini | | REST API | Full CRUD API for any AI tool or custom integration | | Dashboard | Web UI at ace3-ai.com for visual memory management |

Pricing

Permanent free tier - no expiry, no credit card required.

| Tier | Price | For | |------|-------|-----| | Free | £0 forever | Try ACE with 1 namespace, 1,000 memories | | Starter | £14.99/mo | Solo developers (3 namespaces, 5,000 memories) | | Pro | £39.99/mo | Teams (10 users included, +£3/extra, unlimited) | | Founder | £499 one-time | Lifetime Pro+ (25 users) | | Enterprise | Custom | Unlimited everything, SSO, SLA |

View Pricing

Contributing

We welcome contributions to:

• Integrations: VS Code extension, browser extensions
• Parsers: Add support for Rust, Go, Java

Built by a developer, for developers.