Comparison

Probability Sim vs 다 열리는 뷰어

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

Head to head
About

Probability Sim

Features
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Probability Simulator 1T Trials is a powerful simulation app that lets you test probabilities to the extreme. Run up to 1 trillion trials and calculate probabilities as low as 1 in a trillion. Choose from decimal, percentage, or fraction notation. Simultaneously run multiple probability events for complex calculations. Perfect for statistics enthusiasts, mathematicians, and anyone interested in random trials. Sharpen your probability intuition and gain real insights from large-scale simulations.

About

다 열리는 뷰어

Features
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“다 열리는 뷰어” is a file viewer for opening and viewing different documents and files in one place, while making it easy to find and organize what you need. It supports PDF, HWP/HWPX, DOCX, EPUB, HTML, TXT, images, and various Office documents. Open files directly by selecting them in the Files app or from another app’s Share menu. ### Key Features • View PDF documents • View HWP/HWPX Hangul documents • View DOCX documents • View EPUB e-books • View Illustrator (.ai) files • View HTML/HTM documents • View TXT files • View image files • Open Office documents such as XLSX and PPTX supported by iOS system preview • Preview supported audio and video files • Search by file name • Filter and sort by file type • Save frequently viewed files as favorites • Organize files with tags • Save your reading position in PDFs and continue later • View file thumbnails • Reopen recent files • Share files and open them in other apps • Dark mode support Select a file in the Files app or from the Share menu to open it directly with “다 열리는 뷰어”. No login or registration is required. Selected files are displayed read-only on your device and are not uploaded to the developer’s servers. The app focuses on simple file viewing and organization.

Screenshots

Probability Sim2 screens
다 열리는 뷰어4 screens

Verdict

The call

The clearest difference is in-app purchases: 다 열리는 뷰어 at none against Probability Sim's 2. 다 열리는 뷰어 also leads on update cadence (every 3 days vs every 10 months). Probability Sim's advantage is iOS requirement (15.0 vs 17.0). 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. Probability Sim sells 2 in-app purchases, starting at $4.99 per month. 다 열리는 뷰어 asks for nothing beyond the download.

UpkeepUpdate frequency

Probability Sim ships an update every 10 months, 다 열리는 뷰어 every 3 days. The most recent releases landed on October 30, 2026 and October 29, 2026 respectively.

Scorecard3 real differences · 3 level
Probability Sim versus 다 열리는 뷰어: the parameters behind the verdict, then further details
ParameterProbability Sim다 열리는 뷰어
PriceFreeFree
Update frequencyEvery 10 monthsEvery 3 days — better
AdsYesYes
In-app purchasesYesNo — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better17.0
Further details — not scored
Size29 MB14 MB
Age rating4+4+
Developerkota tadaGEUNHYEONG JUNG

In-app purchases

2 purchases

Probability Sim

Subscriptions2
  • Ad-free for 1 month7 Days trial$4.991 Month
  • Ad-free for 1 year14 Days trial$49.991 Year
None

다 열리는 뷰어

No in-app purchases

Questions

Is Probability Sim free?
Probability Sim is free to download, with in-app purchases available.
Is 다 열리는 뷰어 free?
다 열리는 뷰어 is free to download, with no in-app purchases.
Do Probability Sim or 다 열리는 뷰어 have ads?
Both Probability Sim and 다 열리는 뷰어 show ads.
Which is updated more often, Probability Sim or 다 열리는 뷰어?
Probability Sim ships an update every 10 months, and 다 열리는 뷰어 every 3 days. Most recently, Probability Sim was updated on October 30, 2026 and 다 열리는 뷰어 on October 29, 2026.

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