# OnlyBullz vs MetaFox Flatten

The clearest difference is in-app purchases: MetaFox Flatten at none against OnlyBullz's 1. OnlyBullz's advantage is update cadence (every 4 days vs every 3 weeks) and iOS requirement (13.0 vs 15.1). On price, ads and device support there is nothing between them.

Both are free to download. OnlyBullz sells 1 in-app purchase, starting at $9.99 per year. MetaFox Flatten asks for nothing beyond the download.

OnlyBullz ships an update every 4 days, MetaFox Flatten every 3 weeks. The most recent releases landed on October 24, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | OnlyBullz | MetaFox Flatten |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 3 weeks |
| Size | 169 MB | 189 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 9+ |
| Developer | [404 investment Group Inc.](https://appshunter.io/developer/1478027842) | [PHPFOX LLC](https://appshunter.io/developer/1435286537) |

## What reviewers say

### OnlyBullz

[App page](https://appshunter.io/ios/app/onlybullz/id6470817949)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Annual Membership | $9.99 | per year |


### MetaFox Flatten

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

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


## Frequently asked questions

### Is OnlyBullz free?

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

### Is MetaFox Flatten free?

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

### Do OnlyBullz or MetaFox Flatten have ads?

Neither OnlyBullz nor MetaFox Flatten shows ads.

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

OnlyBullz ships an update every 4 days, and MetaFox Flatten every 3 weeks. Most recently, OnlyBullz was updated on October 24, 2026 and MetaFox Flatten on October 10, 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.*