# Infant Simulation System vs ISS Tracker

The clearest difference is in-app purchases: Infant Simulation System at none against ISS Tracker's 3. Infant Simulation System also leads on iOS requirement (13.0 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. ISS Tracker sells 3 in-app purchases, starting at $3.99 per 7 days. Infant Simulation System asks for nothing beyond the download.

Infant Simulation System ships an update every 11 days, ISS Tracker every 9 days. The most recent releases landed on October 7, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | Infant Simulation System | ISS Tracker |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 11 days | **Every 9 days** |
| Size | 5 MB | 63 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Solidusystems SA de CV](https://appshunter.io/developer/1373291923) | [Lalsang Chauhan](https://appshunter.io/developer/6777027233) |

## What reviewers say

### Infant Simulation System

[App page](https://appshunter.io/ios/app/infant-simulation-system/id1631897176)

**Features:** macOS Compatibility

**In-app purchases:** none


### ISS Tracker

[App page](https://appshunter.io/ios/app/iss-tracker-isswatch/id6790068184)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ISSWatch Pro Weekly | $3.99 | per 7 days |
| ISSWatch Pro YearlyGift | $9.99 | per year |
| ISSWatch Pro Yearly | $29.99 | per year |


## Frequently asked questions

### Is Infant Simulation System free?

Infant Simulation System is free to download, with no in-app purchases.

### Is ISS Tracker free?

ISS Tracker is free to download, with in-app purchases available.

### Do Infant Simulation System or ISS Tracker have ads?

Neither Infant Simulation System nor ISS Tracker shows ads.

### Which is updated more often, Infant Simulation System or ISS Tracker?

Infant Simulation System ships an update every 11 days, and ISS Tracker every 9 days. Most recently, Infant Simulation System was updated on October 7, 2026 and ISS Tracker on September 27, 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.*