# iSTONE i6 vs KAI FLY

The clearest difference is iOS requirement: iSTONE i6 at 9.0 against KAI FLY's 12.0. 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.

## The numbers

| Metric | iSTONE i6 | KAI FLY |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Every 6 months |
| Size | 112 MB | 175 MB |
| Requires iOS | **9.0** | 12.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [文 张](https://appshunter.io/developer/1512068135) | [荣军 杨](https://appshunter.io/developer/1494250848) |

## What reviewers say

### iSTONE i6

[App page](https://appshunter.io/ios/app/istone-i6/id6463897483)

**Features:** macOS Compatibility

**In-app purchases:** none


### KAI FLY

[App page](https://appshunter.io/ios/app/kai-fly/id6471225766)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is iSTONE i6 free?

iSTONE i6 is free to download, with no in-app purchases.

### Is KAI FLY free?

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

### Do iSTONE i6 or KAI FLY have ads?

Neither iSTONE i6 nor KAI FLY shows ads.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*