Comparison

PixelCalc vs PDF Maker & Reader Pro

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

Head to head
About

PixelCalc

This tool helps graphic designers and others convert image dimensions between pixels and inches at various resolutions. It also features a proportional calculator for accurate resizing and reference charts for print sizes and camera settings.

Highlights
  • Pixel to Inch conversion
  • Inch to Pixel conversion
  • Resolution adjustment
  • Proportional calculator for resizing
  • Print size reference charts
  • Camera shutter speed chart
Features
Read full description

PixelCalc is a very convenient tool for anyone working with digital images, whether from a Camera, scanner or other input device. It is especially useful for graphic designers who work with both Web and Print media. Either of these two areas of media frequently require conversions from Pixels to Inches and Inches to Pixels along with a desired Resolution (i.e. hi-res, medium-res or low-res). Now includes a Proportional Calculator and useful Reference Charts. Proportional Calculator The Proportional Calculator will instantly calculate enlargements or reductions of images, photos, artwork, layouts, or any kind of design. Basically, anything that needs to be resized accurately while maintaining perfect proportions, the Proportional Calculator will do it. Contains the following handy reference charts: -Maximum Print Size per Megapixels (different resolutions) -Maximum Print Sizes (in inches) by Megapixels @ 300ppi -Shutter Speed Chart (Useful camera tool for perfect shots!) -See the charts in the app for detailed reference information

About

PDF Maker & Reader Pro

Create and edit PDF documents on your iPhone and iPad. Add text, photos, maps, and diagrams to new or existing PDFs. Easily share your creations via email or cloud storage.

Highlights
  • Create new PDF documents
  • Edit existing PDFs
  • Add text, photos, and maps
  • Input manually or with keyboard
  • Support for Apple Pencil
  • Share via email and cloud storage
Features
Read full description

PDF Maker & Reader is a simple and powerful tool for reading and creating PDF. It can be displayed PDF documents on iPhone and iPad and you can input either manually or from the keyboard and add photos, maps, lines and diagrams. And you can make a new PDF document. PDF documents that you made can be output to many applications. [Major Functions] - You can read PDF documents from iTunes, iCloud Drive and many applications.(compatible with App Extensions) - You can make a new PDF document. - You can make a PDF document in the following way.  1. You can input either manually or from the keyboard (compatible with Apple Pencil).  2. You can paste up to photos.  3. You can paste maps.  4. By pasting figures and lines, you can display PDF documents graphically. - You can upload PDF documents to iTunes, iCloud Drive, applications compatible with PDF, and you can attach PDF to emails. [Contact us] https://www.studioks.net/en/contact-us/ [Studio K's - Business Applications Maker] https://www.studioks.net/en/

Screenshots

PixelCalc4 screens
PDF Maker & Reader Pro4 screens

Verdict

The call

The clearest difference is update cadence: PDF Maker & Reader Pro at every 3 weeks against PixelCalc's every 3 months. PDF Maker & Reader Pro also leads on price ($1.99 vs $2.99). On review sentiment, ads, in-app purchases and monetization model 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

PixelCalc costs $2.99 and PDF Maker & Reader Pro $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

PixelCalc ships an update every 3 months, PDF Maker & Reader Pro every 3 weeks. The most recent releases landed on October 8, 2026 and October 6, 2026 respectively.

Scorecard2 real differences · 8 level
PixelCalc versus PDF Maker & Reader Pro: the parameters behind the verdict, then further details
ParameterPixelCalcPDF Maker & Reader Pro
Price$2.99$1.99 — better
Rating—4.3 (12 ratings) — better
Positive reviews41.7% of reviews — better40.0% of reviews
Number of ratings—12 — better
Update frequencyEvery 3 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.010.3 — better
Further details — not scored
Size4 MB14 MB
Age rating4+4+
DeveloperJohn LullieNAOAKI SEKIGUCHI

Customer experience

PixelCalc

Written reviews12 reviews
Positive41.7%
Neutral16.7%
Negative41.7%

PDF Maker & Reader Pro

All ratings12 ratings
Positive83.3%
Neutral0.0%
Negative16.7%
Written reviews5 reviews
Positive40.0%
Neutral0.0%
Negative60.0%

In-app purchases

None

PixelCalc

No in-app purchases

None

PDF Maker & Reader Pro

No in-app purchases

Questions

Is PixelCalc free?
PixelCalc costs $2.99, with no in-app purchases.
Is PDF Maker & Reader Pro free?
PDF Maker & Reader Pro costs $1.99, with no in-app purchases.
Do PixelCalc or PDF Maker & Reader Pro have ads?
Neither PixelCalc nor PDF Maker & Reader Pro shows ads.
Which is updated more often, PixelCalc or PDF Maker & Reader Pro?
PixelCalc ships an update every 3 months, and PDF Maker & Reader Pro every 3 weeks. Most recently, PixelCalc was updated on October 8, 2026 and PDF Maker & Reader Pro on October 6, 2026.

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