Heptabase

Sweet spot: a researcher, grad student, or long-form writer who is doing genuine synthesis work — reading many sources, finding connections, and producing something original. Heptabase's whiteboard is the right surface for that kind of work in a way that document-shaped tools simply are not. Failure modes. The whiteboard is a commitment: if your work is mostly linear (project management, daily journaling, meeting notes), Heptabase will feel heavy compared to a plain outliner. Pricing tiers around AI credits mean serious users get nudged toward Premium+, which gets expensive. Multi-user collaboration exists but is not the focus — pick Notion or FigJam if team workflows matter more than personal depth. What to pilot. Use the 7-day trial on a real research project, not a toy notebook. Clip 30 sources, build one whiteboard, and write a 1,000-word output from it. If the spatial arrangement helped you see connections you would have missed in a linear app, Heptabase has earned its place; if you ended up writing the same way you always do, a cheaper outliner will serve you fine.

Heptabase is a notes app built around the whiteboard, not the document. You write atomic note cards, then arrange them spatially on infinite whiteboards, group them visually, and connect them with arrows. The mental model is closer to a researcher's wall of index cards than to Notion or Evernote — it is designed for the messy middle of thinking, where you have many small ideas and need to see them in relation before they collapse into a final document. The product layers serious AI features on top: an AI tutor that runs structured Socratic learning sessions over your notes, AI-generated insight cards that surface connections across your graph, PDF chat with citations, and OCR over scanned pages. Cards are first-class — bidirectional links, tags, and a card-level editor with block primitives — and everything works offline-first with end-to-end sync. Pricing is tiered around AI usage: Pro at ~$8.99/mo (annual) for unlimited notes but limited AI credits, Premium at ~$17.99/mo adding unlimited PDF uploads and full AI access, and Premium+ for power users who burn through AI credits. Apps ship for Mac, Windows, iOS, Android, and web. Funded by Y Combinator, Kleiner Perkins, and others — well-resourced for the indie note-app category.