The 15 most popular knowledge & memory MCP servers out of 419, with a security level for each.
| # | Name | Popularity | Security |
|---|---|---|---|
| 1 | servers Knowledge graph-based persistent memory for maintaining context. | 91.3k ★ | Low risk |
| 2 | Context7 Up-to-date code documentation for LLMs and AI code editors. | 63.2k ★ | Review before installing |
| 3 | hindsight Hindsight: long-term memory for AI agents modeled on human memory. | 50.9k ★ | Low risk |
| 4 | Cognee Memory manager for AI apps and agents using graph and vector stores, with ingestion from many data sources. | 32.4k ★ | Low risk |
| 5 | Skill Seeker Turn docs, GitHub repos, PDFs, videos, Confluence, Notion and Slack/Discord into AI skills and RAG knowledge, | 15.2k ★ | Low risk |
| 6 | basic-memory Local-first AI memory: a semantic knowledge graph of Markdown files that humans and LLMs both read and write, | 4.3k ★ | Review before installing |
| 7 | NoteDiscovery Self-hosted Markdown knowledge base with a web UI: search, read, create, edit, tag and template notes. | 2.8k ★ | Low risk |
| 8 | memanto Universal memory agent for AI: provides semantic search, namespace management, text/vector operations and RAG | 2.3k ★ | Review before installing |
| 9 | mcp-memory-service Memory service with semantic search, persistent storage and autonomous memory consolidation. | 2k ★ | Low risk |
| 10 | mcp-obsidian Safe read/write access to Obsidian vaults: search, batch operations, tag management and frontmatter handling. | 1.7k ★ | Low risk |
| 11 | ApeRAG RAG platform combining Graph RAG, vector search and full-text search for building knowledge graphs and context | 1.3k ★ | Low risk |
| 12 | deja-vu Local memory over session histories from Claude Code, Codex CLI and opencode: lexical search, session-start au | 1.2k ★ | Low risk |
| 13 | open-ontologies Ontology engineering for OWL, RDF and SPARQL: validate, query, diff, lint, version and govern knowledge graphs | 1.1k ★ | Low risk |
| 14 | mcp-server-chatsum Query and summarize your chat messages with AI prompts. | 1k ★ | Low risk |
| 15 | iai-personal-memory-engine Local memory daemon with episodic, semantic and procedural tiers, SQLite and hnswlib storage, sleep-cycle cons | 911 ★ | Low risk |