# 色差测试 vs WhenRedTap

The clearest difference is in-app purchases: 色差测试 at none against WhenRedTap's 2. 色差测试 also leads on device support (3 vs 1) and iOS requirement (10.0 vs 16.0). On price and ads there is nothing between them.

Both are free to download. WhenRedTap sells 2 one-off in-app purchases. 色差测试 asks for nothing beyond the download.

## The numbers

| Metric | 色差测试 | WhenRedTap |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/whenredtap/id6451321706/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 4 days |
| Monetization | — | Free with in-app purchases |
| Size | 10 MB | 4 MB |
| Requires iOS | **10.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [华生 黄](https://appshunter.io/developer/1493636491) | [泽 王](https://appshunter.io/developer/1382857941) |

## What reviewers say

### 色差测试

[App page](https://appshunter.io/ios/app/id1493636492)

**Features:** macOS Compatibility

**In-app purchases:** none


### WhenRedTap

[App page](https://appshunter.io/ios/app/whenredtap/id6451321706)

Test your reaction time with engaging stopwatch and agility games. Compete on leaderboards and enjoy classic arcade fun. Perfect for quick challenges and improving reflexes.

**Highlights:** Reaction speed testing, Agility games, Leaderboard competition, Whack-a-Mole mini-game, Milliseconds precision tracking

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |
| Paid Unlock | $0.99 | one-time |


## Frequently asked questions

### Is 色差测试 free?

色差测试 is free to download, with no in-app purchases.

### Is WhenRedTap free?

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

### Do 色差测试 or WhenRedTap have ads?

Neither 色差测试 nor WhenRedTap shows ads.

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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.*