# XBuilding vs SKY

The clearest difference is iOS requirement: XBuilding at 13.4 against SKY's 15.1. On price, update cadence, ads and in-app purchases there is nothing between them.

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

XBuilding ships an update every 3 months, SKY every 6 weeks. The most recent releases landed on October 5, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | XBuilding | SKY |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 6 weeks** |
| Size | 73 MB | 43 MB |
| Requires iOS | **13.4** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Nguyen Chinh](https://appshunter.io/developer/1303331188) | [SKY-LINE School](https://appshunter.io/developer/1831218041) |

## What reviewers say

### XBuilding

[App page](https://appshunter.io/ios/app/xbuilding/id6739273993)

**Features:** macOS Compatibility

**In-app purchases:** none


### SKY

[App page](https://appshunter.io/ios/app/sky-line-school-e-connect/id6749571097)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is XBuilding free?

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

### Is SKY free?

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

### Do XBuilding or SKY have ads?

Neither XBuilding nor SKY shows ads.

### Which is updated more often, XBuilding or SKY?

XBuilding ships an update every 3 months, and SKY every 6 weeks. Most recently, XBuilding was updated on October 5, 2026 and SKY on October 9, 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.*