# Probability Sim vs 다 열리는 뷰어

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.

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.

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.

## The numbers

| Metric | Probability Sim | 다 열리는 뷰어 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 10 months | **Every 3 days** |
| Size | 29 MB | 14 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [kota tada](https://appshunter.io/developer/1658942612) | [GEUNHYEONG JUNG](https://appshunter.io/developer/6791427912) |

## What reviewers say

### Probability Sim

[App page](https://appshunter.io/ios/app/probability-sim-trillion/id6743378063)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ad-free for 1 month | $4.99 | per month |
| Ad-free for 1 year | $49.99 | per year |


### 다 열리는 뷰어

[App page](https://appshunter.io/ios/app/id6791518758)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*