# ISN CS vs K

The clearest difference is update cadence: ISN CS at every 5 months against K's every 21 months. K's advantage is iOS requirement (13.0 vs 15.6). 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.

ISN CS ships an update every 5 months, K every 21 months. The most recent releases landed on September 25, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | ISN CS | K |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 21 months |
| Size | 6 MB | 230 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Aleut Community of St. Paul Island Tribal Government](https://appshunter.io/developer/1329178887) | [Guangdong KSTE lighting industry Co.,Ltd](https://appshunter.io/developer/1604704962) |

## What reviewers say

### ISN CS

[App page](https://appshunter.io/ios/app/isn-cs/id1329189918)

**Features:** macOS Compatibility

**In-app purchases:** none


### K

[App page](https://appshunter.io/ios/app/k-smart/id1604704960)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ISN CS free?

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

### Is K free?

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

### Do ISN CS or K have ads?

Neither ISN CS nor K shows ads.

### Which is updated more often, ISN CS or K?

ISN CS ships an update every 5 months, and K every 21 months. Most recently, ISN CS was updated on September 25, 2026 and K on October 8, 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.*