Heptabase is a visual note-taking tool that helps you learn complex topics by creating and organizing cards on infinite whiteboards. It allows you to capture your highlights from PDFs and Readwise, add tags and properties to your cards, and search for any question you have in your personal knowledge base.
Heptabase is designed to help you record your thinking process, understand the logic and relationships between different concepts, and recall your notes with perfect visual memory.
After using Evernote for almost a decade, using Roam Research, then Obsidian for Zettelkasten, I finally settle with Heptabase. It's a great piece of software, and the team is super reactive. They managed to build a great community on Discord, and implement user feedback when shipping new features.