# BlueOpen vs KRAT

The clearest difference is update cadence: KRAT at monthly against BlueOpen's every 4 months. 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.

BlueOpen ships an update every 4 months, KRAT monthly. The most recent releases landed on September 20, 2026 and May 17, 2026 respectively.

## The numbers

| Metric | BlueOpen | KRAT |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Monthly** |
| Size | 38 MB | 42 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [JCM Technologies S.A.](https://appshunter.io/developer/1475472503) | [震 王](https://appshunter.io/developer/1734329851) |

## What reviewers say

### BlueOpen

[App page](https://appshunter.io/ios/app/blueopen/id1531849084)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


### KRAT

[App page](https://appshunter.io/ios/app/krat/id6478905393)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is BlueOpen free?

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

### Is KRAT free?

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

### Do BlueOpen or KRAT have ads?

Neither BlueOpen nor KRAT shows ads.

### Which is updated more often, BlueOpen or KRAT?

BlueOpen ships an update every 4 months, and KRAT monthly. Most recently, BlueOpen was updated on September 20, 2026 and KRAT on May 17, 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.*