# Probability Toolkit vs Organisms & their Environment

The clearest difference is update cadence: Probability Toolkit at every 10 months against Organisms & their Environment's every 31 months. Organisms & their Environment's advantage is device support (3 vs 1) and price ($0.99 vs $1.99). On ads, in-app purchases and iOS requirement there is nothing between them.

Probability Toolkit costs $1.99 and Organisms & their Environment $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Probability Toolkit ships an update every 10 months, Organisms & their Environment every 31 months. The most recent releases landed on October 19, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Probability Toolkit | Organisms & their Environment |
| --- | --- | --- |
| Price | $1.99 | **$0.99** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 10 months** | Every 31 months |
| Size | 41 MB | 51 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ventura Educational Systems](https://appshunter.io/developer/371324172) | [www.ajaxmediatech.com](https://appshunter.io/developer/973768003) |

## What reviewers say

### Probability Toolkit

[App page](https://appshunter.io/ios/app/probability-toolkit/id652216774)

**Features:** macOS Compatibility

**In-app purchases:** none


### Organisms & their Environment

[App page](https://appshunter.io/ios/app/organisms-and-their-environment/id1209436017)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Probability Toolkit free?

Probability Toolkit costs $1.99, with no in-app purchases.

### Is Organisms & their Environment free?

Organisms & their Environment costs $0.99, with no in-app purchases.

### Do Probability Toolkit or Organisms & their Environment have ads?

Neither Probability Toolkit nor Organisms & their Environment shows ads.

### Which is updated more often, Probability Toolkit or Organisms & their Environment?

Probability Toolkit ships an update every 10 months, and Organisms & their Environment every 31 months. Most recently, Probability Toolkit was updated on October 19, 2026 and Organisms & their Environment on October 6, 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.*