KnowledgeBase Builder

KnowledgeBase Builder is a private personal knowledge management and digital second-brain app for connecting millions of ideas. Create flexible knowledge networks where any node can link to another, then explore them through interactive 3D views, mind maps, whiteboards, kanban boards, flowcharts, org charts and more.

Add rich notes, checklists, tables, attachments and web links to every node. Use full-text search across your knowledge base and documents, import content from Wikipedia, Wikidata and Obsidian, or use AI and MCP support to expand diagrams and summarize text. Categories, tags, filters, flashcards and spaced repetition support learning and project organization. Data is stored locally in SQLite files with no required account, subscription or forced cloud storage, while open export formats make your knowledge portable across devices.