# What is behind ? vs 6 Differences

The clearest difference is ads: 6 Differences at none against What is behind ?'s shown. 6 Differences also leads on iOS requirement (13.0 vs 15.6). What is behind ?'s advantage is update cadence (every 5 months vs every 43 months). On price, 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.

What is behind ? ships an update every 5 months, 6 Differences every 43 months. The most recent releases landed on October 2, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | What is behind ? | 6 Differences |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.6 (5 ratings)](https://appshunter.io/ios/app/what-is-behind/id625107769/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 5 months** | Every 43 months |
| Monetization | Ad-supported | — |
| Size | 65 MB | 131 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Heitz Bruno](https://appshunter.io/developer/556457592) | [Hieu Hoang](https://appshunter.io/developer/1108291419) |

## What reviewers say

### What is behind ?

[App page](https://appshunter.io/ios/app/what-is-behind/id625107769)

Engage in a cooperative word-guessing game with friends across 100 challenging levels. Seek help from teammates and collect bonuses to conquer difficult stages. This interactive puzzle experience will test your collective problem-solving abilities.

**Highlights:** 100 levels of puzzles, Teamwork-based gameplay, Ask friends for advice, Earn bonuses, Interactive challenges

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

**In-app purchases:** none


### 6 Differences

[App page](https://appshunter.io/ios/app/6-differences-spot-them/id1628381817)

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

**In-app purchases:** none


## Frequently asked questions

### Is What is behind ? free?

What is behind ? is free to download, with no in-app purchases.

### Is 6 Differences free?

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

### Do What is behind ? or 6 Differences have ads?

What is behind ? shows ads; 6 Differences does not.

### Which is updated more often, What is behind ? or 6 Differences?

What is behind ? ships an update every 5 months, and 6 Differences every 43 months. Most recently, What is behind ? was updated on October 2, 2026 and 6 Differences on October 7, 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.*