Heptabase is an intelligent visual knowledge management platform built for students, researchers, and lifelong learners who need to organize, connect, and deeply understand complex information. At its core, Heptabase uses an infinite whiteboard canvas where notes exist as cards that can be spatially arranged, clustered, and linked — enabling users to literally see how ideas relate to one another. Unlike traditional linear note-taking apps, Heptabase lets you map entire topics visually, then zoom into individual cards for detailed writing. The platform's AI capabilities are tightly integrated with your personal knowledge base: the AI Chat can reference your whiteboards and cards, explain imported PDFs and research papers, and surface connections across thousands of notes. Research assistance is powered by leading models from OpenAI, Google Gemini, and Anthropic, with responses grounded in verifiable citations from your own sources. Heptabase also supports PDF annotation, YouTube transcript import, Readwise integration, bi-directional linking, and a fast full-text search that handles 10,000+ notes in under one second. The CLI tool enables agent-based automation workflows for power users. Real-time collaboration is included without per-user fees — every plan allows unlimited collaborator invites. Backed by Y Combinator and Kleiner Perkins, Heptabase has established itself as the go-to knowledge management tool for academics, medical and law students, writers doing deep research, and anyone who thinks visually. The 7-day free trial requires no credit card, and annual plans offer approximately 25% savings over monthly billing.