# MetaFox Flatten vs Sngine

The clearest difference is update cadence: MetaFox Flatten at every 3 weeks against Sngine's every 9 months. MetaFox Flatten also leads on iOS requirement (15.1 vs 17.0). 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.

MetaFox Flatten ships an update every 3 weeks, Sngine every 9 months. The most recent releases landed on October 27, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | MetaFox Flatten | Sngine |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 9 months |
| Size | 189 MB | 7 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 9+ | 4+ |
| Developer | [PHPFOX LLC](https://appshunter.io/developer/1435286537) | [Yehia Abed](https://appshunter.io/developer/1722931199) |

## What reviewers say

### MetaFox Flatten

[App page](https://appshunter.io/ios/app/metafox-flatten/id6478136620)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


### Sngine

[App page](https://appshunter.io/ios/app/sngine/id6596779025)

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

**In-app purchases:** none


## Frequently asked questions

### Is MetaFox Flatten free?

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

### Is Sngine free?

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

### Do MetaFox Flatten or Sngine have ads?

Neither MetaFox Flatten nor Sngine shows ads.

### Which is updated more often, MetaFox Flatten or Sngine?

MetaFox Flatten ships an update every 3 weeks, and Sngine every 9 months. Most recently, MetaFox Flatten was updated on October 27, 2026 and Sngine on October 30, 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.*