# Observer for Screeps vs Subterranean

The clearest difference is iOS requirement: Subterranean at 13.0 against Observer for Screeps's 17.0. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Observer for Screeps | Subterranean |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Every 2 days |
| Size | 6 MB | 142 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Jacob Kelly](https://appshunter.io/developer/1026086454) | [Tayin Wallace](https://appshunter.io/developer/1658923996) |

## What reviewers say

### Observer for Screeps

[App page](https://appshunter.io/ios/app/observer-for-screeps/id1496710102)

**Features:** Vision Pro support

**In-app purchases:** none


### Subterranean

[App page](https://appshunter.io/ios/app/subterranean/id6754824884)

**In-app purchases:** none


## Frequently asked questions

### Is Observer for Screeps free?

Observer for Screeps is free to download, with no in-app purchases.

### Is Subterranean free?

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

### Do Observer for Screeps or Subterranean have ads?

Neither Observer for Screeps nor Subterranean 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.*