Comparison

Photos PDF vs ProcessModelling

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

Head to head
About

Photos PDF

Easily convert your photos and images into professional-looking PDFs in just a few steps. Organize, sign, and share your documents directly from your device. Enjoy a user-friendly experience with versatile options for customization and secure, on-device processing.

Highlights
  • Image to PDF conversion
  • On-device processing
  • PDF signing
  • Folder organization
  • Customizable file names
  • Share and print PDFs
Features
Read full description

+ Images to PDF in 3 easy steps + 1. Open App 2. Select images or capture new ones 3. Tap 'Convert to PDF' Experience unparalleled ease! Transforming your images into stunning PDFs has never been simpler. Say goodbye to convoluted apps with unnecessary features. Elevate your productivity effortlessly with Photos to PDF Converter. Photos to PDF Converter Features: + User-Friendly Design + Our app is designed for everyone—no need for complicated converters. Enjoy a fast and straightforward experience with an intuitive design. + Versatility + Tailor Photos to PDF according to your needs. Whether you desire a basic converter or wish to apply image rotation or filters, we've got you covered. + Swift and Secure + All PDF conversions occur directly on your device, ensuring the security of your images and files. Experience rapid conversions in seconds, just as it should be! + Organization Made Easy + Efficiently manage your PDF documents with folder organization and customizable file names. Keep your app clutter-free, even with a multitude of PDFs! + Sign documents + Just open your PDF, select "Sign", add you signature and done! Sign your documents fast and easy. + Share and Print + Export and share all your PDF documents right from the app with a single tap. Send via iMessage, Open in other apps, Print, etc. *PDF is created with watermark. To disable watermark, please upgrade to PRO version*

About

ProcessModelling

Features
Read full description

ProcessModelling is a professional steady-state process simulation tool for gas processing and pipeline engineering — built for macOS, iPad, and iPhone, so it goes with you into the field, not just to a desk. Model complete flowsheets using industry-standard thermodynamics and a full set of common unit operations, then check results against your own hand calculations or a full-scale simulator. KEY FEATURES Peng-Robinson and Soave-Redlich-Kwong equations of state Full unit operation set: Valve, Heater, Pump, Compressor, Expander, Mixer, Splitter, Pipe, Separator, Scrubber Beggs & Brill multiphase pipe flow correlation for wet and multiphase pipelines Recycle, with accelerated convergence, and adjust blocks for modelling flexibility Component splitter for basic conditioning operations (eg. dehydration) Automatically generated block diagrams of your model, with PDF export A bundled example model and full in-app user manual to get started quickly BUILT TO MAKE YOU THINK, NOT JUST CLICK ProcessModelling isn't a drag-and-drop flowsheet editor. Every model is written as a clear, explicit deck — every stream, every piece of equipment, every condition, stated in your own words. That's a deliberate choice: it's easy to stitch blocks together by eye until something converges without ever really thinking through the process you're describing. Writing it down forces that thinking to happen. An in-app keyword assistant helps you write decks quickly — inserting the correct shape of any block, with placeholders showing exactly what's expected — without ever guessing a value on your behalf. Developed and cross-checked throughout against established process simulation practice.

Screenshots

Photos PDF4 screens
ProcessModelling4 screens

Verdict

The call

Photos PDF and ProcessModelling are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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. Photos PDF sells 1 one-off in-app purchase and ProcessModelling sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Photos PDF ships an update every 10 days, ProcessModelling every 8 days. The most recent releases landed on November 15, 2026 and November 13, 2026 respectively.

ScorecardNo meaningful differences
Photos PDF versus ProcessModelling: the parameters behind the verdict, then further details
ParameterPhotos PDFProcessModelling
PriceFreeFree
Rating4.9 (68K ratings) — better—
Positive reviews80.8% of reviews—
Number of ratings68K — better—
Update frequencyEvery 10 daysEvery 8 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPad, Mac — better
Requires iOS17.0 — better17.6
Further details — not scored
Size26 MB4 MB
Age rating4+4+
DeveloperDIGISET LLCADG Energy Services Ltd

Bugs and requests

Photos PDF

Reported bugs

2 issues
  • Restore purchase function not working
  • Compatibility issues with older devices

Requested features

3 requests
  • Add page numbering feature
  • Improve image cropping and editing tools
  • Integrate with more cloud storage services

ProcessModelling

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Photos PDF

One-time1
  • Photos to PDF Pro$9.99
1 purchases

ProcessModelling

One-time1
  • Full Version$19.99

Questions

Is Photos PDF free?
Photos PDF is free to download, with in-app purchases available.
Is ProcessModelling free?
ProcessModelling is free to download, with in-app purchases available.
Do Photos PDF or ProcessModelling have ads?
Neither Photos PDF nor ProcessModelling shows ads.
Which is updated more often, Photos PDF or ProcessModelling?
Photos PDF ships an update every 10 days, and ProcessModelling every 8 days. Most recently, Photos PDF was updated on November 15, 2026 and ProcessModelling on November 13, 2026.

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