Comparison

MarginNote 4 vs 判別式電卓

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

MarginNote 4

This app integrates reading, note-taking, mind mapping, and flashcards into a unified study environment. It supports active learning with features like study sets, book compilation, and dual-article views. Enhance your understanding with visual learning tools and AI-powered content extraction for long-term memory retention.

Highlights
  • Integrated reading, note-taking, mind mapping, and flashcards
  • Quick Extend Note and Handwriting Layers for annotation
  • Study Set for organizing PDFs, EPUBs, videos, and audio
  • Mind Map and Concept Diagram for visual learning
  • AI Content Detection for formula and chart extraction
  • FSRS spaced-repetition algorithm for reviews
  • iCloud sync across Apple devices
Features
Read full description

MarginNote is the PDF study tool for deep readers. One excerpt is a PDF highlight, a mind map node, and a flashcard — one capture, three places. This is the Card Axis architecture, so you stop ferrying content between a PDF reader, a notes app, and a flashcard tool. A decade of iteration. 188K+ App Store ratings. 【Four Featured Mechanics】 ▸ Card Axis — One excerpt, three renders. Document highlight, mind map node, and flashcard are the same card seen from three angles. ▸ Title Link — Old notes auto-surface in new documents. When a familiar concept appears in what you're reading, your past annotation lights up on the page. ▸ Extended Note — Long-press anywhere on a PDF to open writing space. No anchored text required; three display modes (inline / margin / collapsed). ▸ Immersive Mode (4.4) — Three-state toggle: Read / Write / Recall. UI folds away. Recall blurs excerpts with Gaussian blur — tap to reveal only after you've actually recalled. 【AI Capabilities (introduced in 4.2)】 AI book breakdown · AI OCR templates · AI translation · AI Q&A · AI flashcard generation Our stance is AI as assistant, not replacement — every suggestion can be saved as your own thinking node, never thinking for you. 【Apple Intelligence (iOS 26+)】 Recall Mode hints can run on-device via Apple Intelligence — pick "Apple AI" or "cloud LLM" in Settings. With Apple AI selected, three tiers of help — Neighbor Coordinate · Reasoning Prompt · Key Distinction — are generated by Apple Foundation Models right on your device: no network calls, no AI credits used, your notes never leave your device. Even if you've selected cloud LLM, going offline auto-falls back to Apple Intelligence (provided your device supports it) — so libraries, planes, and exam-day silent rooms never break your hint loop. 【Full Workflow】 Fast OCR · Study Sets (PDF / EPUB / video / audio) · direct read from Zotero / cloud drives / USB · 10 mind map styles · book recomposition · dual-document compare · concept maps · handwriting layers 【FSRS Spaced Repetition】 Built on the open-spaced-repetition project's algorithm (paper accepted by ACM SIGKDD; Anki has used FSRS as its default scheduler since v23.10). Push short-term memory into long-term. 【Built For】 Anyone re-reading a single document until it sticks — med school (USMLE / MCAT) · law school (LSAT / bar exam) · grad prep (GRE / GMAT / CFA) · researchers · language learners (IELTS / TOEFL) · serious readers. 【All Apple Platforms】 iPhone + iPad + Mac under one Apple ID. iCloud syncs Study Sets, notes, and review progress. Native Apple Pencil support on iPad. — Questions? Email service@marginnote.com Terms: https://dist.marginnote.com/MarginNote_Terms_and_Conditions.pdf Privacy: https://dist.marginnote.com/MarginNote_Privacy_Policy.pdf

About

判別式電卓

Features
Read full description

【シンプルで使いやすい判別式計算アプリ - 判別式の計算をスマートに】 判別式の計算を素早く、簡単に行える電卓アプリが登場。 直感的なインターフェースと多機能なツールで、計算がこれまでになくスムーズになります。 ◎ 主な機能 使いやすいデザイン:シンプルで見やすいインターフェース。誰でも簡単に操作可能。 ルート・分数に対応:ルートから分数まであらゆる判別式に対応。 桁数調整:判別式Dの桁数を調整できます。四捨五入、切り捨て、切り上げに対応。 広告なし:広告に邪魔されることなく快適に使用可能。

Screenshots

MarginNote 44 screens
判別式電卓3 screens

Verdict

The call

The clearest difference is price: MarginNote 4 at Free against 判別式電卓's $0.49. 判別式電卓's advantage is in-app purchases (none vs 13) and iOS requirement (12.0 vs 17.0). On ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

MarginNote 4 is free to download; 判別式電卓 costs $0.49 up front. MarginNote 4 sells 12 in-app purchases, starting at $1.99 per month. 判別式電卓 asks for nothing beyond the download.

Scorecard3 real differences · 7 level
MarginNote 4 versus 判別式電卓: the parameters behind the verdict, then further details
ParameterMarginNote 4判別式電卓
PriceFree — better$0.49
Rating4.5 (716 ratings) — better—
Positive reviews58.5% of reviews—
Number of ratings716 — better—
Update frequencyEvery 3 weeks—
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, MaciPhone, iPad, iPod
Requires iOS17.012.0 — better
Further details — not scored
Size330 MB27 MB
Age rating4+4+
DeveloperBeijing Yunsi Software Technology Co., Ltdkotobaz

Bugs and requests

MarginNote 4

Reported bugs

3 issues
  • Disappearing annotations when using extend function
  • Inability to restore accidentally deleted mind maps
  • Inconsistent behavior with PDF file management

Requested features

4 requests
  • Improved iCloud/cloud sync reliability
  • More intuitive and user-friendly interface
  • Better support for external document libraries
  • Ability to disable auto-excerpt selection

判別式電卓

Not enough reviews yet to summarise bugs or requests.

In-app purchases

12 purchases

MarginNote 4

Subscriptions5
  • Subscription to MAX (Monthly)7 Days trial$1.991 Month
  • Subscription to MAX (3 months)7 Days trial$4.993 Months
  • Subscription to MAX (6 months)7 Days trial$7.996 Months
Show 2 more
  • Subscription to MAX (Annually)1 Month trial$12.991 Year
  • MarginNote Max Annual1 Month trial$16.991 Year
One-time7
  • 14 days Free Trial2 variantsFree
  • Upgrade to PRO from MN3(iOS)$4.99
  • Unlock PRO Forever (New)$12.99
Show 4 more
  • Upgrade to MAX from MN3(macOS)$19.99
  • Unlock MAX based on PRO$39.99
  • Unlock MAX based on PRO (New)$40.00
  • Unlock MAX Forever (New)$51.99
None

判別式電卓

No in-app purchases

Questions

Is MarginNote 4 free?
MarginNote 4 is free to download, with in-app purchases available.
Is 判別式電卓 free?
判別式電卓 costs $0.49, with no in-app purchases.
Do MarginNote 4 or 判別式電卓 have ads?
Neither MarginNote 4 nor 判別式電卓 shows ads.

Other comparisons