# Reliability of systems vs Stochastic Processes

The clearest difference is in-app purchases: Stochastic Processes at none against Reliability of systems's 1. Reliability of systems's advantage is device support. On price and iOS requirement there is nothing between them.

Both are free to download. Reliability of systems sells 1 one-off in-app purchase. Stochastic Processes asks for nothing beyond the download.

## The numbers

| Metric | Reliability of systems | Stochastic Processes |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | — |
| Update frequency | Every 18 months | — |
| Size | 4 MB | 21 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | — |
| Age rating | 4+ | 4+ |
| Developer | [Siu Yuen Ho](https://appshunter.io/developer/814088527) | [Ilona Kosinska](https://appshunter.io/developer/1538804529) |

## What reviewers say

### Reliability of systems

[App page](https://appshunter.io/ios/app/reliability-of-systems/id6443837301)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Pro feature | $1.99 | one-time |


### Stochastic Processes

[App page](https://appshunter.io/ios/app/stochastic-processes/id6737203969)

**In-app purchases:** none


## Frequently asked questions

### Is Reliability of systems free?

Reliability of systems is free to download, with in-app purchases available.

### Is Stochastic Processes free?

Stochastic Processes is free to download, with no in-app purchases.

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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.*