# Serum X vs Sky

The clearest difference is ads: Serum X at none against Sky's shown. Serum X also leads on iOS requirement (10.3 vs 15.0). Sky's advantage is update cadence (every 3 weeks vs every 4 months). On price, 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.

Serum X ships an update every 4 months, Sky every 3 weeks. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Serum X | Sky |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.6 (5 ratings)](https://appshunter.io/ios/app/serum-x/id1275596958/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 99 MB | 368 MB |
| Requires iOS | **10.3** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Jose Lopez](https://appshunter.io/developer/373679428) | [RXR Gaming Ltd](https://appshunter.io/developer/1791818762) |

## What reviewers say

### Serum X

[App page](https://appshunter.io/ios/app/serum-x/id1275596958)

Uncover a revolutionary serum before it's misused. Employ detective skills in this point-and-click adventure to locate its hidden storage. Navigate a world of scientific progress and industrial change to secure the future.

**Highlights:** Detective gameplay, Point-and-click mechanics, Room escape puzzles, Story-driven adventure, Scientific advancements theme

**Features:** macOS Compatibility

**In-app purchases:** none


### Sky

[App page](https://appshunter.io/ios/app/sky-pirates/id6751173969)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Serum X free?

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

### Is Sky free?

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

### Do Serum X or Sky have ads?

Sky shows ads; Serum X does not.

### Which is updated more often, Serum X or Sky?

Serum X ships an update every 4 months, and Sky every 3 weeks. Most recently, Serum X was updated on November 3, 2026 and Sky on October 30, 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.*