MarginNote 4: The AI-Powered Second Brain for Deep Learning and Research

MarginNote 4 – Note-taking, Mind Map & Flashcards in One Study App MarginNote 4 combines reading, note taking, mind mapping, and spaced-repetition flashcards in a single workspace. Preview, attend class, consolidate, practice, review, and remember with proven study methods. KEY FEATURES CRITICAL THINKING * Quick Extend Note: add extra writing space beside any paragraph for insights or questions * Handwriting Layers: show or hide ink to refresh a book for a new round of study ACTIVE LEARNING * Study Set: keep PDFs, EPUBs, videos, and audio in one project and see how they connect * Book Compile: rearrange pages, merge chapters, or insert explanations from other books * Dual-Article View: compare two related documents side by side * Distraction-Free Mode * Fast OCR engine for clean PDF annotation * External Library Access: open files from Zotero, USB drives, and more without copying * Lightning-fast full-text search across notes and files VISUAL LEARNING * Mind Map: build a tree of ideas; choose from 10 branch styles * Concept Diagram: link cards with lines or gestures on an infinite canvas * Outliner: edit and reorder text nodes in bulk * Card Board: sort cards by color or tag in a Zettelkasten-style wall SMART NOTE TAKING * Custom Toolbar: colors, labels, and cloze highlights turn annotation into knowledge coding * AI Content Detection: one-tap extraction of formulas and charts from academic papers * Auto Mind Map creation from up to 10 card properties KNOWLEDGE BRIDGE * Split-view combos and in-app web search keep context at hand * Keyword links automatically surface related notes * Backlinks record page, map position, and timestamp for every card LONG-TERM MEMORY * In-place Flashcard Editor: create front/back cards the moment you excerpt * FSRS spaced-repetition algorithm schedules perfect review times SHARE & COLLABORATE * iCloud sync on iPhone, iPad, and Mac * URL scheme jumps back to any moment in your study * Multi-window and external-monitor support with drag & drop * Presentation Mode records visible actions for live demos * End-to-end encrypted sharing protects your study sets MEMBERSHIP TIERS Basic – Free Read, highlight, and use Quick Extend Note. Browse shared study sets at no cost. Pro – One-Time Purchase Unlock the full iPad experience with Apple Pencil shortcuts, on-device OCR, AI extraction, and multi-window power. Max – One-Time Purchase or Semester Upgrade Get Pro features on every Apple device, plus advanced academic tools on Mac and future platforms. All plans include a 14-day free trial. Cancel anytime in your iTunes settings. Questions? Email service@marginnote.com Terms of Use: https://dist.marginnote.cn/MarginNote_Terms_and_Conditions.pdf Privacy Policy: https://dist.marginnote.cn/MarginNote_Privacy_Policy.pdf