Nexus Catalyst alternatives
12 MCP servers, A2A agents and x402 APIs that also do knowledge & memory, ranked by how much they overlap with Nexus Catalyst (MCP server), live ones first.
Compared
| Name | Type | Live | Tools / skills | Check |
|---|---|---|---|---|
| Nexus Catalyst (this one) | MCP server | Yes | – | 55/100 |
| Archivist AI | MCP server | Yes | 40 | 80/100 |
| Assertion Memory | MCP server | Yes | 9 | 80/100 |
| Colour Memory | MCP server | Yes | 40 | 80/100 |
| Continuity by Ouroboros Apps | MCP server | Yes | 11 | 80/100 |
| ENYAL by Greenland AI | MCP server | Yes | 9 | 80/100 |
| Great Arrow | MCP server | Yes | 40 | 80/100 |
| SPM - Structured Project Memory | MCP server | Yes | 40 | 80/100 |
| Synap Memory | MCP server | Yes | 4 | 80/100 |
| AiAkiv Memory | MCP server | Yes | – | 55/100 |
| Ari Coach | MCP server | Yes | – | 55/100 |
| ASR Memory (에사 AI) — Shared memory for AI tools | MCP server | Yes | – | 55/100 |
| Brainiall Memory | MCP server | Yes | – | 55/100 |
Live = answered our latest free daily check. Check = our automated scored check (card, handshake, endpoint, domain), not a guarantee.
The alternatives
- Archivist AI Live MCP
Official remote MCP server for Archivist AI TTRPG campaign memory: characters, sessions, and more.
MCP server · io.github.Astrotomic · 40 tools · check 80/100 · also does knowledge & memory
- Assertion Memory Live MCP
Recall your team's coding-agent memory. Install the Assertion plugin to capture it automatically.
MCP server · io.github.Assertion-AI · 9 tools · check 80/100 · also does knowledge & memory
- Colour Memory Live MCP
Colour meaning, history and evidence for AI: 45,000+ source-graded colour records and 91 tools.
MCP server · io.github.DigbyO · 40 tools · check 80/100 · also does knowledge & memory
- Continuity by Ouroboros Apps Live MCP
Story continuity, novel memory, and series bible for fiction writers, shared with AI assistants
MCP server · io.github.LAHutchins91 · 11 tools · check 80/100 · also does knowledge & memory
- ENYAL by Greenland AI Live MCP
ENYAL by Greenland AI — encrypted identity & memory for AI agents (query, recall, provenance)
MCP server · ai.enyal · 9 tools · check 80/100 · also does knowledge & memory
- Great Arrow Live MCP
Shared memory and actions for Claude, Kiro, OpenAI, Cursor, and other MCP-compatible AI clients.
MCP server · ai.greatarrow · 40 tools · check 80/100 · also does knowledge & memory
- SPM - Structured Project Memory Live MCP
Durable, shareable and governed project memory with smart triage and explicit project composition.
MCP server · com.getspm · 40 tools · check 80/100 · also does knowledge & memory
- Synap Memory Live MCP
Persistent memory for AI agents — log and recall conversation context over MCP.
MCP server · ai.maximem · 4 tools · check 80/100 · also does knowledge & memory
- AiAkiv Memory Live MCP
Shared long-term memory for AI agents: save and recall context as a searchable knowledge graph.
MCP server · com.aiakiv · check 55/100 · also does knowledge & memory
- Ari Coach Live MCP
Second opinion on a hard decision from Ari, an AI with its own memory. Slow (2-4 min), paid.
MCP server · io.github.ariflixconomy · check 55/100 · also does knowledge & memory
- ASR Memory (에사 AI) — Shared memory for AI tools Live MCP
Shared memory for AI tools: save once, recall word for word from Claude, ChatGPT, Codex or Gemini.
MCP server · com.asrmemory · check 55/100 · also does knowledge & memory
- Brainiall Memory Live MCP
Persistent semantic memory storage, associative recall, and recent memory index by namespace.
MCP server · com.brainiall · check 55/100 · also does knowledge & memory