# Sharp Eye Challenge vs Ref!Ref!Ref!

The clearest difference is in-app purchases: Sharp Eye Challenge at none against Ref!Ref!Ref!'s 2. Sharp Eye Challenge also leads on ads (none vs shown) and device support (3 vs 1). On price there is nothing between them.

Both are free to download. Ref!Ref!Ref! sells 1 one-off in-app purchase. Sharp Eye Challenge asks for nothing beyond the download.

## The numbers

| Metric | Sharp Eye Challenge | Ref!Ref!Ref! |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | — | Every 5 days |
| Size | 100 MB | 147 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Thai Tran Hong](https://appshunter.io/developer/1858505088) | [Aziz Ahmet Saybir](https://appshunter.io/developer/6788466053) |

## What reviewers say

### Sharp Eye Challenge

[App page](https://appshunter.io/ios/app/sharp-eye-challenge/id6760840397)

**In-app purchases:** none


### Ref!Ref!Ref!

[App page](https://appshunter.io/ios/app/refrefref/id6788466051)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $3.99 | one-time |


## Frequently asked questions

### Is Sharp Eye Challenge free?

Sharp Eye Challenge is free to download, with no in-app purchases.

### Is Ref!Ref!Ref! free?

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

### Do Sharp Eye Challenge or Ref!Ref!Ref! have ads?

Ref!Ref!Ref! shows ads; Sharp Eye Challenge does not.

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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.*