# Goldbach's Conjecture vs Probability Theory Foundations

The clearest difference is price: Probability Theory Foundations at Free against Goldbach's Conjecture's $0.99. Goldbach's Conjecture's advantage is iOS requirement (12.0 vs 15.1). On ads, in-app purchases and device support there is nothing between them.

Probability Theory Foundations is free to download; Goldbach's Conjecture costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Goldbach's Conjecture | Probability Theory Foundations |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | — |
| Size | 34 MB | 38 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPad, Mac | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ventura Educational Systems](https://appshunter.io/developer/371324172) | [AFTW LLC](https://appshunter.io/developer/1886356149) |

## What reviewers say

### Goldbach's Conjecture

[App page](https://appshunter.io/ios/app/goldbachs-conjecture/id1385243580)

**In-app purchases:** none


### Probability Theory Foundations

[App page](https://appshunter.io/ios/app/probability-theory-foundations/id6773734025)

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

**In-app purchases:** none


## Frequently asked questions

### Is Goldbach's Conjecture free?

Goldbach's Conjecture costs $0.99, with no in-app purchases.

### Is Probability Theory Foundations free?

Probability Theory Foundations is free to download, with no in-app purchases.

### Do Goldbach's Conjecture or Probability Theory Foundations have ads?

Neither Goldbach's Conjecture nor Probability Theory Foundations shows ads.

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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.*