# XiL HIS vs czi Sky

The clearest difference is update cadence: czi Sky at every 3 weeks against XiL HIS's every 2 months. XiL HIS's advantage is iOS requirement (12.0 vs 16.0). 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.

XiL HIS ships an update every 2 months, czi Sky every 3 weeks. The most recent releases landed on October 7, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | XiL HIS | czi Sky |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Size | 55 MB | 32 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [秋菊 莫](https://appshunter.io/developer/1536512171) | [Guangzhou Chengzhi Intelligent Machine Technology Co., Ltd.](https://appshunter.io/developer/1675437495) |

## What reviewers say

### XiL HIS

[App page](https://appshunter.io/ios/app/xil-his/id6444336763)

**Features:** macOS Compatibility

**In-app purchases:** none


### czi Sky

[App page](https://appshunter.io/ios/app/czi-sky/id6746466110)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is XiL HIS free?

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

### Is czi Sky free?

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

### Do XiL HIS or czi Sky have ads?

Neither XiL HIS nor czi Sky shows ads.

### Which is updated more often, XiL HIS or czi Sky?

XiL HIS ships an update every 2 months, and czi Sky every 3 weeks. Most recently, XiL HIS was updated on October 7, 2026 and czi Sky on October 1, 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.*