Comparison

PDF Merge X vs Solution Calculator

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

Head to head
About

PDF Merge X

Easily merge, reorder, and rotate PDF documents. This app offers fast, secure, and offline processing for organizing notes, contracts, and more. It provides a simple interface for combining multiple files into one, with options to add pages and preview changes before sharing.

Highlights
  • Merge multiple PDFs
  • Reorder and rotate pages
  • Combine PDFs without quality loss
  • Add blank pages or images
  • Offline processing
  • No watermarks
Features
Read full description

The Ultimate PDF Merger & Organizer – Fast, Simple, & Secure Need to reorder pages, merge PDF documents, or rotate PDFs? PDF Merge X is the smart, no-fuss solution. Whether you're a student organizing notes or a pro managing contracts, PDF Merge X gives you full control. Fast, offline, and without watermarks. Why PDF Merge X? Merge PDF in One Tap – Quickly combine multiple PDFs into a single, organized document. Join PDFs Without Quality Loss – Keep your document quality intact while merging. Rearrange & Organize – Easily reorder, delete, or duplicate pages within your PDF. Secure & Private – Process files offline with no data stored on external servers. Built-in Features for Better PDF Control Merge PDFs Effortlessly – Select multiple files and combine them into one seamless document. PDF Join & Combine – Keep files organized with fast PDF joining. Reorder & Rotate Pages – Drag-and-drop to organize or fix page orientation. Add Pages Easily – Insert blank pages or add images from your photo library directly into any PDF. Instant PDF Preview – Check your document before finalizing changes. Merge PDFs in One Go – Combine several PDFs at once with a dedicated merge action. Lightning-Fast Performance – Our PDF merger is optimized for speed and efficiency. Seamless Sharing – Export PDFs and share via email, iCloud Drive, or your favorite apps. Undo & Redo Support – Make adjustments confidently with undo and redo options. iCloud & Files App Integration – Open and save files directly from your preferred storage. Built-in PDF Previewer – Review your PDFs without leaving the app. How it Works Drag, Drop & Merge – Select your PDFs and join them instantly. Reorder & Rotate – Arrange pages in any order or adjust orientation. Preview & Share – Review before saving and share effortlessly. Free Version – Simple & Powerful PDF Editing Get started with PDF Merge X for free and access essential PDF editing tools without subscriptions. What’s Included in the Free Version? Merge PDFs – Combine up to two PDFs into a single document. Reorder & Rotate – Rearrange pages or adjust orientation. Delete Pages – Remove unwanted pages with one tap. Preview & Share – Check your document before saving and export seamlessly. Upgrade to Pro with a one-time purchase and unlock unlimited PDF editing, and advanced features—no recurring fees. No watermarks. No ads. No subscriptions. Just powerful, easy-to-use PDF tool! Try PDF Merge X Today! Merge, reorder, combine, and manage your PDF files with ease. Download PDF Merge X now and streamline your workflow in just a few taps!

About

Solution Calculator

Features
Read full description

Provides calculations for solution dilution and preparation.

Screenshots

PDF Merge X4 screens
Solution Calculator3 screens

Verdict

The call

The clearest difference is in-app purchases: Solution Calculator at none against PDF Merge X's 1. Solution Calculator also leads on update cadence (every 6 days vs every 2 months) and iOS requirement (16.6 vs 26.0). On price, 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

Both are free to download. PDF Merge X sells 1 one-off in-app purchase. Solution Calculator asks for nothing beyond the download.

UpkeepUpdate frequency

PDF Merge X ships an update every 2 months, Solution Calculator every 6 days. The most recent releases landed on October 26, 2026 and October 25, 2026 respectively.

Scorecard3 real differences · 7 level
PDF Merge X versus Solution Calculator: the parameters behind the verdict, then further details
ParameterPDF Merge XSolution Calculator
PriceFreeFree
Rating4.1 (92 ratings) — better—
Positive reviews64.9% of reviews—
Number of ratings92 — better—
Update frequencyEvery 2 monthsEvery 6 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPad
Requires iOS26.016.6 — better
Further details — not scored
Size17 MB2 MB
Age rating4+17+
DeveloperDaniel JirkuXING WU

Bugs and requests

PDF Merge X

Reported bugs

15 issues
  • Cannot view 2 pages side-by-side
  • App gets stuck on saving screen
  • No landscape mode for iPads
  • Latest update made free version paid
  • Cannot search for PDFs on phone unless cloud/recents
Show 10 more
  • Does not preserve signatures
  • Watermark remains after purchase
  • Unmerged PDFs disappeared
  • Changes disappear after saving
  • No iPad UI
  • App crashes when clicking share/OneDrive icon
  • No email attachment added
  • Cannot open PDFs
  • Original PDF text wiped in merge
  • Cannot view, save, mail, or transfer PDFs

Requested features

6 requests
  • Batch renaming
  • Better preview zoom
  • Night mode
  • Landscape mode for iPads
  • Advanced search functionality
Show 1 more
  • Ability to overwrite original documents

Solution Calculator

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

PDF Merge X

One-time1
  • PDF Merge X Pro$6.99
None

Solution Calculator

No in-app purchases

Questions

Is PDF Merge X free?
PDF Merge X is free to download, with in-app purchases available.
Is Solution Calculator free?
Solution Calculator is free to download, with no in-app purchases.
Do PDF Merge X or Solution Calculator have ads?
Neither PDF Merge X nor Solution Calculator shows ads.
Which is updated more often, PDF Merge X or Solution Calculator?
PDF Merge X ships an update every 2 months, and Solution Calculator every 6 days. Most recently, PDF Merge X was updated on October 26, 2026 and Solution Calculator on October 25, 2026.

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