A Mac native app designed to help users study math and computer science textbooks by annotating at the sentence and word level, with features for organizing notes across different sections and integrating Excalidraw diagrams for visual explanations.
Margin is a macOS app designed to help students study technical PDF textbooks more effectively. It lets users add notes and explanations directly beside text, organize related notes into scratchpads by topic, and revisit their work through an interactive book map. The app saves locally without requiring subscriptions or accounts, works offline, and supports PDFs up to 2,000 pages on Apple silicon Macs running Sonoma or later.