Comparison

PDF Note Pro vs Cortex

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

Head to head
About

PDF Note Pro

This application allows users to take freehand notes directly on PDF documents and record audio simultaneously. Notes are saved in native PDF and M4A formats, syncing across devices via iCloud for seamless access on mobile, desktop, and web. It offers powerful annotation tools and is available for free on iOS.

Highlights
  • Freehand PDF annotation
  • M4A audio recording
  • iCloud syncing across devices
  • Native PDF and M4A formats
  • Vector drawing tools
  • Text tool for typing
  • Image and web page insertion
Features
Read full description

PDF Note Pro is the most innovative, flexible, compatible, and powerful Note-Taking application! PDF Note Pro features Freehand Notes in a Native PDF format, and Audio recording in a Native M4A format. Using the PDF format, Freehand Notes are synced across all your devices (via iCloud) so you always have the latest version of your Notes with you -- regardless of device. And since PDF Note Pro uses the PDF format, you can annotate PDFs with powerful Note-taking tools *and* your Notes are ready for Mobile, Desktop, Web, and Print right from the get go: No more manually exporting notes and uploading files - PDF Note Pro handles everything for you! And best of all, PDF Note Pro is free for iOS and only $9.99 (U.S.) for OS X! With iCloud Drive, you can take Notes on the go and have your Notes ready at your Mac or Windows PC already downloaded when you get home* And If that wasn't enough, PDFs can be transferred instantly from one device to another with iCloud HandOff so you can start working on one device, and continue on another (iPhone, iPad, and Mac)** iOS Specific Features: - Innovative Graphical File Manager with Natural Touch Gestures: Single Tap to Select a File, Double-Tap to Open a File, Two Finger "Pinch" to Zoom the File Manager, and Tap and Hold to Drag Files onto Folders - Photorealistic page swipe animations (swipe the vertical edge of a PDF page horizontally to go to the previous or next page) - Draw using Palm Rest or Magnifier Window with "Smart Shift" technology Innovative Features on both iOS and OS X: - Freehand draw on Notes using native PDF format with “Vector" note taking tools such as Pencil, Eraser, and Highlighter; keeping PDF file sizes small - Record Audio in M4A format with stunning 3D Visualizor; M4A Audio files are synced to all your devices - iCloud support keeps your documents in Sync across iPhone, iPad, and Mac; and with iCloud Drive, Windows PCs and well* - iCloud HandOff lets you start work on one device and continue on another (iPhone, iPad, and Mac)** - Text Tool lets your Touch/Click to Type anywhere (iPad/Mac) - Cut Tool Makes it easy to reposition PDF content - Add Images, Text, and Web Pages to a PDF instantly (iPad/Mac) - Full Speech-To-Text Dictation support anywhere you can Type (Press Dictation key on keyboard on iOS, press “Fn” key twice on OS X) - iCloud is completely optional — PDF Note Pro works just as well offline as online! * iCloud Drive Support for Windows requires iCloud Drive install, iCloud Drive for Mac requires OS X 10.10 or later; iCloud Drive supports PDF/M4A **iCloud HandOff requires both Bluetooth 4.0/LE and WiFi on and enabled; iCloud HandOff works with PDF only ***Large PDF Documents in the Cloud (such as large eBooks) is not recommended*** ***If you have any issues please restart your device!***

About

Cortex

Features
Read full description

Cortex turns medical learning into a daily habit. Step into the role of the only doctor on duty and solve realistic clinical cases — read the presentation, work through the patient, and sharpen the diagnostic instincts that exams and the wards demand. Every day brings a fresh case. Build a streak, earn XP, climb the leagues, and watch your skills grow from medical student to expert clinician. WHAT YOU GET - Daily Clinical Cases — a new patient mystery every single day to keep you sharp - Master Every Specialty — train across cardiology, hematology, nephrology, infectious disease, rheumatology, vascular medicine, and more - Compete & Climb — rise through Bronze, Silver and beyond in weekly leagues - Streaks & Rewards — keep your diagnostic flame alive, earn coins, and use Streak Freezes to protect your momentum - Level Up — earn XP, unlock specialty trophies, and track your journey from student to master - Practice Anytime — a permanent library of cases to browse and solve on your schedule WHO IT'S FOR Medical students, interns, residents, and doctors who want a fast, fun, and genuinely challenging way to revise clinical reasoning — whether you're prepping for exams or keeping your edge between shifts. WHY CORTEX No dry question banks. No clutter. Just beautifully simple cases, real progression, and the daily push to think like a doctor. Note: Cortex is a learning and revision tool for medical education and entertainment. It is not a medical device and is not intended for real-world diagnosis, treatment, or clinical decision-making. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://cortexcases.com/privacy

Screenshots

PDF Note Pro4 screens
Cortex4 screens

Verdict

The call

The clearest difference is update cadence: Cortex at weekly against PDF Note Pro's every 11 months. PDF Note Pro's advantage is iOS requirement (14.0 vs 17.0). On price, ads, in-app purchases 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

Both are free to download. PDF Note Pro sells 1 one-off in-app purchase and Cortex sells 2 in-app purchases, starting at $11.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

PDF Note Pro ships an update every 11 months, Cortex weekly. The most recent releases landed on September 30, 2026 and September 13, 2026 respectively.

Scorecard2 real differences · 8 level
PDF Note Pro versus Cortex: the parameters behind the verdict, then further details
ParameterPDF Note ProCortex
PriceFreeFree
Rating2.0 (1 ratings) — better—
Positive reviews0.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 11 monthsWeekly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS14.0 — better17.0
Further details — not scored
Size18 MB87 MB
Age rating17+17+
DeveloperMach Software DesignRudrakshi Patel

In-app purchases

1 purchases

PDF Note Pro

One-time1
  • Remove Ads2 variants$0.99
2 purchases

Cortex

Subscriptions2
  • Cortex Monthly Subscription$11.991 Month
  • Cortex Yearly Subscription$79.991 Year

Questions

Is PDF Note Pro free?
PDF Note Pro is free to download, with in-app purchases available.
Is Cortex free?
Cortex is free to download, with in-app purchases available.
Do PDF Note Pro or Cortex have ads?
Neither PDF Note Pro nor Cortex shows ads.
Which is updated more often, PDF Note Pro or Cortex?
PDF Note Pro ships an update every 11 months, and Cortex weekly. Most recently, PDF Note Pro was updated on September 30, 2026 and Cortex on September 13, 2026.

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