Heptabase

Heptabase is a visual knowledge base for students, researchers and lifelong learners. Users collect sources, notes, highlights and discussions in one place and lay them out on whiteboards made of cards, with a block based editor, bi directional links, daily journals, PDF annotation, YouTube transcripts and a web clipper. AI is built into the workspace. An AI agent can explain sources, take notes and organize the knowledge base, and an AI Tutor runs structured, personalized learning sessions that plan lessons and track progress through a course. Integrations include Readwise and Zotero, and a Heptabase CLI is described as working with coding agents such as Claude Code and Codex. Apps are available for desktop and mobile. The site lists three paid plans, with a 7 day trial and a yearly option that saves 25 percent. Pro is shown at $8.99 per month and includes unlimited notes, whiteboards and tags, PDF highlights, an AI agent limited to Gemini models, and 100 AI credits per month. Premium is $17.99 per month and adds unlimited PDF uploads and OCR parsing, an AI agent that can use GPT, Claude and Gemini models, the AI Tutor and 1,800 credits per month. Premium+ is $53.99 per month with 8,100 credits and a 33 percent discount on AI credits.