# Triangle Area Calculator Pro vs Probability Sim

The clearest difference is price: Probability Sim at Free against Triangle Area Calculator Pro's $1.99. Probability Sim also leads on update cadence (every 10 months vs every 38 months). Triangle Area Calculator Pro's advantage is in-app purchases (none vs 2) and ads (none vs shown). On device support and iOS requirement there is nothing between them.

Probability Sim is free to download; Triangle Area Calculator Pro costs $1.99 up front. Probability Sim sells 2 in-app purchases, starting at $4.99 per month. Triangle Area Calculator Pro asks for nothing beyond the download.

Triangle Area Calculator Pro ships an update every 38 months, Probability Sim every 10 months. The most recent releases landed on October 20, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Triangle Area Calculator Pro | Probability Sim |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 38 months | **Every 10 months** |
| Size | 0 MB | 29 MB |
| Requires iOS | **14.2** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Anna Filobok](https://appshunter.io/developer/1613515832) | [kota tada](https://appshunter.io/developer/1658942612) |

## What reviewers say

### Triangle Area Calculator Pro

[App page](https://appshunter.io/ios/app/triangle-area-calculator-pro/id1568248433)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Triangle Area Calculator Pro free?

Triangle Area Calculator Pro costs $1.99, with no in-app purchases.

### Is Probability Sim free?

Probability Sim is free to download, with in-app purchases available.

### Do Triangle Area Calculator Pro or Probability Sim have ads?

Probability Sim shows ads; Triangle Area Calculator Pro does not.

### Which is updated more often, Triangle Area Calculator Pro or Probability Sim?

Triangle Area Calculator Pro ships an update every 38 months, and Probability Sim every 10 months. Most recently, Triangle Area Calculator Pro was updated on October 20, 2026 and Probability Sim on October 22, 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.*