# BACKDOOR会員アプリ vs RedBlack

The clearest difference is in-app purchases: BACKDOOR会員アプリ at none against RedBlack's 1. BACKDOOR会員アプリ also leads on device support and iOS requirement (15.1 vs 17.0). On price there is nothing between them.

Both are free to download. RedBlack sells 1 one-off in-app purchase. BACKDOOR会員アプリ asks for nothing beyond the download.

## The numbers

| Metric | BACKDOOR会員アプリ | RedBlack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/backdoor/id6448009971/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | — |
| Update frequency | Monthly | — |
| Monetization | Free | — |
| Size | 41 MB | 4 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPod** | — |
| Age rating | 4+ | 4+ |
| Developer | [ROUNDERS, K.K.](https://appshunter.io/developer/1683263820) | [AKIYAMA KENICHI](https://appshunter.io/developer/1886479212) |

## What reviewers say

### BACKDOOR会員アプリ

[App page](https://appshunter.io/ios/app/backdoor/id6448009971)

This is an exclusive members-only application for Amusement Casino BACKDOOR. Access special features and information as a valued member.

**Highlights:** Exclusive member access, Information for Amusement Casino BACKDOOR, Members-only features

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

**In-app purchases:** none


### RedBlack

[App page](https://appshunter.io/ios/app/redblack/id6760839362)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


## Frequently asked questions

### Is BACKDOOR会員アプリ free?

BACKDOOR会員アプリ is free to download, with no in-app purchases.

### Is RedBlack free?

RedBlack is free to download, with in-app purchases available.

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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.*