Heptabase

Heptabase is a visual knowledge management app built for students, researchers, and lifelong learners who need to organize complex source material. Instead of a linear document or a simple folder tree, it centers work around infinite whiteboards where notes, PDF highlights, YouTube transcripts, and daily journal entries can be spatially arranged and linked together, making it easier to see how ideas connect across a large body of reading. The app combines a block-based editor with bi-directional linking, offline access, and fast full-text search across thousands of notes. Built-in AI features can summarize sources, answer questions grounded in a user's own notes, and help organize material pulled in from Readwise or Zotero, while native apps for Mac, Windows, iOS, and Android keep the knowledge base available across devices.