# XC vs SK

The clearest difference is device support: SK at 3 against XC's 1. XC's advantage is iOS requirement (12.0 vs 15.6). 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.

Both ship on a similar rhythm, roughly every 6 months. The most recent releases landed on October 26, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | XC | SK |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | Every 6 months |
| Size | 160 MB | 31 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Technotree Co., Ltd.](https://appshunter.io/developer/536035514) | [Niigata Seiki Co., Ltd.](https://appshunter.io/developer/960556292) |

## What reviewers say

### XC

[App page](https://appshunter.io/ios/app/xc-ent/id897389421)

**Features:** macOS Compatibility

**In-app purchases:** none


### SK

[App page](https://appshunter.io/ios/app/sk-log/id1499031153)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is XC free?

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

### Is SK free?

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

### Do XC or SK have ads?

Neither XC nor SK shows ads.

### Which is updated more often, XC or SK?

XC ships an update every 6 months, and SK every 6 months. Most recently, XC was updated on October 26, 2026 and SK on October 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.*