# Knowledge and memory MCP servers online

Check the source documentation for each connection.

61 MCP servers. Also on the [web page](https://mcpdirectory.fyi/us/global/online/category/knowledge-memory).

## MCP servers

1. [adrkit decision memory](https://mcpdirectory.fyi/us/global/online/adrkit-decision-memory.md), Knowledge and memory, Online: Deterministic, offline, read-only ADR decision memory for coding agents. No model or network calls.
2. [Agent Wikis](https://mcpdirectory.fyi/us/global/online/agent-wikis.md), Knowledge and memory, Online: Maintained, agent-readable knowledge bases with calibrated search and provenance. Pro key adds XL.
3. [Apple Books](https://mcpdirectory.fyi/us/global/online/apple-books.md), Knowledge and memory, Online: Access your Apple Books library, annotations, reading progress, and highlights through Claude
4. [Apple Notes](https://mcpdirectory.fyi/us/global/online/apple-notes.md), Productivity and collaboration, Online: Inspect, search, create, edit, move, and organize notes in Apple Notes on macOS.
5. [Apple Tools (Unified)](https://mcpdirectory.fyi/us/global/online/apple-tools-unified.md), Productivity and collaboration, Online: Unified Apple ecosystem MCP server for macOS: Mail, Calendar, Notes, Files, Messages, and more.
6. [Better Bear](https://mcpdirectory.fyi/us/global/online/better-bear.md), Knowledge and memory, Online: MCP server for Bear notes — read, search, create, edit, tag, and manage notes via CloudKit
7. [Context](https://mcpdirectory.fyi/us/global/online/context.md), Developer tools, Online: Local-first documentation for AI agents. Offline, instant, private doc retrieval.
8. [ContextStream MCP Server](https://mcpdirectory.fyi/us/global/online/contextstream-mcp-server.md), Knowledge and memory, Online: The context platform for AI agents: code search, team decisions, and grounded project context.
9. [DocPull](https://mcpdirectory.fyi/us/global/online/docpull.md), Search and research, Online: Sync public web sources into cited context packs for AI agents, RAG, and MCP clients.
10. [DollhouseMCP](https://mcpdirectory.fyi/us/global/online/dollhousemcp.md), Developer tools, Online: OSS to create Personas, Skills, Templates, Agents, and Memories to customize your AI experience.
11. [Hive Vault](https://mcpdirectory.fyi/us/global/online/hive-vault.md), Knowledge and memory, Online: On-demand Obsidian vault access for AI coding assistants — 17 tools, 5 resources, 4 prompts.
12. [Hivemind](https://mcpdirectory.fyi/us/global/online/hivemind.md), Knowledge and memory, Online: MCP server for Obsidian vaults - AI tools with consistent canonical context. Local-first.
13. [Holographic Memory](https://mcpdirectory.fyi/us/global/online/holographic-memory.md), Knowledge and memory, Online: Local persistent memory for AI agents with recall, search, forgetting, and encrypted storage.
14. [IWE (iwe.md)](https://mcpdirectory.fyi/us/global/online/iwe-iwe-md.md), Knowledge and memory, Online: Markdown knowledge base as agent memory. Runs against the notes directory it is started in.
15. [llmwiki](https://mcpdirectory.fyi/us/global/online/llmwiki.md), Knowledge and memory, Online: Compile documents into a cited knowledge wiki. Retrieve evidence, query, and review via local MCP.
16. [Local FAISS MCP Server](https://mcpdirectory.fyi/us/global/online/local-faiss-mcp-server.md), Knowledge and memory, Online: Local FAISS vector database for RAG with document ingestion, semantic search, and MCP prompts.
17. [Longhand](https://mcpdirectory.fyi/us/global/online/longhand.md), Knowledge and memory, Online: Local memory for Claude Code. Semantic recall across session history with zero API calls.
18. [Mcp Apple Notes](https://mcpdirectory.fyi/us/global/online/mcp-apple-notes.md), Productivity and collaboration, Online: MCP server for Apple Notes integration using AppleScript with full CRUD operations
19. [Minutes](https://mcpdirectory.fyi/us/global/online/minutes.md), Knowledge and memory, Online: The private, owned conversation-memory layer for AI. Record, transcribe, and search every meeting.
20. [Mnemex](https://mcpdirectory.fyi/us/global/online/mnemex.md), Knowledge and memory, Online: Temporal memory for AI with decay and reinforcement. Two-layer storage (JSONL + Markdown).
21. [Mnemosyne OS](https://mcpdirectory.fyi/us/global/online/mnemosyne-os.md), Knowledge and memory, Online: Memory the human governs, on their own machine, plus what other coding agents here wrote.
22. [Obsidian Mcp Server](https://mcpdirectory.fyi/us/global/online/obsidian-mcp-server.md), Knowledge and memory, Online: Read, write, search, and surgically edit Obsidian notes, tags, and frontmatter via MCP.
23. [Obsidian Sync Mcp](https://mcpdirectory.fyi/us/global/online/obsidian-sync-mcp.md), Knowledge and memory, Online: Give AI agents access to your Obsidian vault via local files or Self-hosted LiveSync.
24. [OpenMyMemo](https://mcpdirectory.fyi/us/global/online/openmymemo.md), Knowledge and memory, Online: Your AI memory as a local folder you own. Every app shares it; you see and can undo each change.
25. [Projectmem](https://mcpdirectory.fyi/us/global/online/projectmem.md), Knowledge and memory, Online: Coding agent memory — one local MCP server for every project. Warns before repeating failed fixes.
26. [Research Hub](https://mcpdirectory.fyi/us/global/online/research-hub.md), Search and research, Online: Research workspace for Zotero + Obsidian + NotebookLM. Search, ingest, sync, verify briefs.
27. [Seekstone](https://mcpdirectory.fyi/us/global/online/seekstone.md), Knowledge and memory, Online: Filesystem-direct Obsidian MCP server — search and edit your vault with low context-tax.
28. [Selvedge](https://mcpdirectory.fyi/us/global/online/selvedge.md), Knowledge and memory, Online: Persistent decision memory for AI agents: rationale, rejected approaches, and entity history.
29. [sqlite-graph-memory](https://mcpdirectory.fyi/us/global/online/sqlite-graph-memory.md), Knowledge and memory, Online: Recall over your markdown notes: vector search plus your \[\[wikilinks\]\] as a graph, in SQLite.
30. [State Memory MCP](https://mcpdirectory.fyi/us/global/online/state-memory-mcp.md), Knowledge and memory, Online: Persistent workflow graph server tracking tasks, decisions, spatial entities, and blockers.
31. [Understand Quickly](https://mcpdirectory.fyi/us/global/online/understand-quickly.md), Developer tools, Online: Public registry of code-knowledge graphs for AI agents with schema validation and drift detection.
32. [Velocirag](https://mcpdirectory.fyi/us/global/online/velocirag.md), Knowledge and memory, Online: Lightning-fast RAG for AI agents. 4-layer fusion, ONNX Runtime, sub-200ms search.
33. [Veracium](https://mcpdirectory.fyi/us/global/online/veracium.md), Knowledge and memory, Online: Provenance-aware memory for AI agents: quarantine, abstention gate, supersession-with-history.
34. [Vestige](https://mcpdirectory.fyi/us/global/online/vestige.md), Knowledge and memory, Online: Causal Proof Engine for AI agents: signed log, zero vectors, failures traced to their cause.
35. [Workflowy](https://mcpdirectory.fyi/us/global/online/workflowy.md), Productivity and collaboration, Online: Create, update, complete nodes, search & replace with regex and dry run, usage reports, transforms
36. [World Model MCP](https://mcpdirectory.fyi/us/global/online/world-model-mcp-2.md), Knowledge and memory, Online: Persistent 3D/2D spatial world model for AI agents with dynamic velocity and entity tracking.
37. [Zaxy](https://mcpdirectory.fyi/us/global/online/zaxy.md), Knowledge and memory, Online: Event-sourced, auditable agent memory over MCP: cited checkout, replayable provenance.
38. [Zotero MCP](https://mcpdirectory.fyi/us/global/online/zotero-mcp.md), Search and research, Online: Search your Zotero library, retrieve item metadata, and read full text from AI assistants.
39. [AitherOS ADK](https://mcpdirectory.fyi/us/global/online/aitheros-adk.md), Developer tools, Online: Agent runtime with typed memory, knowledge and code graphs, plus file and web tools
40. [Dabble Me Journal](https://mcpdirectory.fyi/us/global/online/dabble-me-journal.md), Knowledge and memory, Online: Private journal MCP server to search, analyze, and create Dabble Me entries securely via OAuth.
41. [Glean Remote MCP Server](https://mcpdirectory.fyi/us/global/online/glean-remote-mcp-server.md), Knowledge and memory, Online: Remote MCP Server that securely connects Glean Enterprise Knowledge with your IDE, LLM, or agents.
42. [Honcho](https://mcpdirectory.fyi/us/global/online/honcho.md), Knowledge and memory, Online: Memory that reasons: continual learning for stateful agents. Better context, fewer tokens.
43. [Northwestern University Libraries Digital Collections API](https://mcpdirectory.fyi/us/global/online/northwestern-university-libraries-digital-collections-api.md), Search and research, Online: Agent integration with the Northwestern University Libraries Digital Collections API
44. [Pensyve](https://mcpdirectory.fyi/us/global/online/pensyve.md), Knowledge and memory, Online: Universal memory runtime for AI agents — episodic, semantic, and procedural memory.
45. [SAME - Stateless Agent Memory Engine](https://mcpdirectory.fyi/us/global/online/same-stateless-agent-memory-engine.md), Knowledge and memory, Online: Persistent memory for AI coding agents. Local-first SQLite + vector search. 17 MCP tools.
46. [Visual Memory MCP](https://mcpdirectory.fyi/us/global/online/visual-memory-mcp.md), Knowledge and memory, Online: Local visual UI cache for AI agents using perceptual hashing, CLIP, and 3D spatial grounding.
47. [Engram: AI memory you can edit in Obsidian](https://mcpdirectory.fyi/us/global/online/engram-ai-memory-you-can-edit-in-obsidian.md), Knowledge and memory, Online: Shared memory for Claude, ChatGPT and any MCP client. Read and edit it in Obsidian or the web app.
48. [Anneal Memory](https://mcpdirectory.fyi/us/global/online/anneal-memory.md), Knowledge and memory, Online: Two-layer memory for AI agents with an immune system. Zero dependencies.
49. [Connapse](https://mcpdirectory.fyi/us/global/online/connapse.md), Knowledge and memory, Online: Self-hosted knowledge backend for AI agents with hybrid search and MCP tools
50. [Context7](https://mcpdirectory.fyi/us/global/online/context7.md), Developer tools, Online: Up-to-date docs for AI agents

This copy lists 50 of 61. The [web page](https://mcpdirectory.fyi/us/global/online/category/knowledge-memory) has the rest.

## Other categories in Online

- [Developer tools](https://mcpdirectory.fyi/us/global/online/category/developer-tools.md): 189 MCP servers
- [Finance and crypto](https://mcpdirectory.fyi/us/global/online/category/finance-crypto.md): 124 MCP servers
- [Productivity and collaboration](https://mcpdirectory.fyi/us/global/online/category/productivity-collaboration.md): 80 MCP servers
- [Search and research](https://mcpdirectory.fyi/us/global/online/category/search-research.md): 75 MCP servers
- [Cloud and DevOps](https://mcpdirectory.fyi/us/global/online/category/cloud-devops.md): 72 MCP servers
- [Health and science](https://mcpdirectory.fyi/us/global/online/category/health-science.md): 58 MCP servers
- [Security](https://mcpdirectory.fyi/us/global/online/category/security.md): 53 MCP servers
- [Data and databases](https://mcpdirectory.fyi/us/global/online/category/data-databases.md): 46 MCP servers
- [Communication](https://mcpdirectory.fyi/us/global/online/category/communication.md): 42 MCP servers
- [Ecommerce](https://mcpdirectory.fyi/us/global/online/category/ecommerce.md): 35 MCP servers
- [AI and media generation](https://mcpdirectory.fyi/us/global/online/category/ai-media-generation.md): 34 MCP servers
- [Other tools](https://mcpdirectory.fyi/us/global/online/category/other-tools.md): 33 MCP servers
- [Sales and marketing](https://mcpdirectory.fyi/us/global/online/category/sales-marketing.md): 30 MCP servers
- [Web and browser automation](https://mcpdirectory.fyi/us/global/online/category/web-browser-automation.md): 29 MCP servers