Comparison

PDF Notes S vs Quadrant Magnetics Calculator

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

Head to head
About

PDF Notes S

This app offers a dual-page PDF viewer with smooth scrolling and fast page turns. It also provides document management, quick previews of various file types, and annotation tools. An upgrade removes ads and unlocks full functionality.

Highlights
  • Dual-page PDF viewer
  • Horizontal/vertical scroll and page turns
  • Document browser for file organization
  • Quick Look for various file types
  • ZIP file preview without unzipping
  • 8 handwriting tools
  • Cache manager for fast page turns
Read full description

PDF Notes S gives you a 2 pages viewer with horizontal/vertical scroll, and cache for fast page turns, and thumbnails scrollbar. PDF Notes S gives you ZIP Preview, Quick Look of documents, images, music, videos, and etc. PDF Notes S gives you Document Browser so that you can organize all your files very easily. PDF Viewer - 1 page or 2 pages, horizontal or vertical fast page turns - Scroll or page turns by tap on sides - 8 handwriting tools that you can adjust color and line width - Horizontal or vertical thumbnails scrollbar - PDF outlines, bookmarks, and annotations list - PDF search - Cache manager supports 3 modes, permanent cache, automatic cache, and no cache Quick Look, ZIP Preview - PDF, RTF, TEXT - iWork documents, Office documents - Images, Music, PiP Videos - Without Unzip, preview ZIP contents (password may be requested if locked) Advertisements before upgrade - Banner ads can be shown at the bottom - Interstitial ads can be shown per 30 minutes Information about the auto-renewable nature of the subscription - Payment will be charged to iTunes Account at confirmation of purchase. - Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. - Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal. - Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase. - Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable. A link to privacy policy and terms of use - http://blog.musebook.com/2017/03/privacy-policy.html The length of the subscription - Monthly or Yearly NOTE: All content contained herein is subject to change without notice.

About

Quadrant Magnetics Calculator

Calculate magnetic force, permeance coefficient, and demagnetizing factor for various magnet shapes. Input magnet dimensions and grade or Br value to get results based on computer simulation data.

Highlights
  • Calculate magnetic force
  • Calculate permeance coefficient
  • Calculate demagnetizing factor
  • Supports rectangular blocks
  • Supports axially magnetized rings
  • Supports axially magnetized cylinders
Read full description

The Magnetics Calculator provides a mobile APP to conveniently calculate the magnetic force F, the permeance coefficient Pc, and the demagnetizing factor N for the following magnet shapes: - Rectangular blocks - Axially magnetized Rings - Axially magnetized Cylinders The users can get the results by selecting one of three magnet shapes, and one of two steel boundary conditions, as well as inputting the magnet dimensions and magnet grade or the Br value. The calculator uses computer simulation data of magnets interacting with steel plates (cold rolled steel CR1010) that are both thicker and larger than the magnets. Force in actual applications may vary significantly given different boundary conditions. Contact us for your specific needs.

Screenshots

PDF Notes S4 screens
Quadrant Magnetics Calculator4 screens

Verdict

The call

The clearest difference is rating: Quadrant Magnetics Calculator at 5.0 against PDF Notes S's 4.2. Quadrant Magnetics Calculator also leads on in-app purchases (none vs 2) and ads (none vs shown). PDF Notes S's advantage is iOS requirement (13.0 vs 15.1). On price, ratings volume, update cadence 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 Notes S sells 2 in-app purchases, starting at $0.99 per month. Quadrant Magnetics Calculator asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Quadrant Magnetics Calculator holds the better App Store score, 5.0 against 4.2. Both are backed by a comparable volume of ratings — 5 and 2 respectively.

UpkeepUpdate frequency

PDF Notes S ships an update every 6 weeks, Quadrant Magnetics Calculator every 2 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

Scorecard5 real differences · 5 level
PDF Notes S versus Quadrant Magnetics Calculator: the parameters behind the verdict, then further details
ParameterPDF Notes SQuadrant Magnetics Calculator
PriceFreeFree
Rating4.2 (5 ratings)5.0 (2 ratings) — better
Positive reviews52.9% of reviews—
Number of ratings5 — better2
Update frequencyEvery 6 weeks — betterEvery 2 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS13.0 — better15.1
Further details — not scored
Size22 MB26 MB
Age rating4+4+
DeveloperAMuseTec Co., Ltd.Quadrant International

Customer experience

PDF Notes S

All ratings5 ratings
Positive80.0%
Neutral0.0%
Negative20.0%
Written reviews17 reviews
Positive52.9%
Neutral35.3%
Negative11.8%

Quadrant Magnetics Calculator

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

2 purchases

PDF Notes S

Subscriptions2
  • Monthly Plan$0.991 Month
  • Yearly Plan$9.991 Year
None

Quadrant Magnetics Calculator

No in-app purchases

Questions

Is PDF Notes S free?
PDF Notes S is free to download, with in-app purchases available.
Is Quadrant Magnetics Calculator free?
Quadrant Magnetics Calculator is free to download, with no in-app purchases.
Which has better reviews, PDF Notes S or Quadrant Magnetics Calculator?
Quadrant Magnetics Calculator is rated higher. PDF Notes S averages 4.2 out of 5 from 5 ratings, while Quadrant Magnetics Calculator averages 5.0 from 2 ratings.
Do PDF Notes S or Quadrant Magnetics Calculator have ads?
PDF Notes S shows ads; Quadrant Magnetics Calculator does not.
Which is updated more often, PDF Notes S or Quadrant Magnetics Calculator?
PDF Notes S ships an update every 6 weeks, and Quadrant Magnetics Calculator every 2 months. Most recently, PDF Notes S was updated on November 1, 2026 and Quadrant Magnetics Calculator on November 2, 2026.

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