# BUMPY UFO vs Defense Factory

The clearest difference is in-app purchases: BUMPY UFO at none against Defense Factory's 9. BUMPY UFO also leads on iOS requirement (8.0 vs 15.0). Defense Factory's advantage is update cadence (every 2 days vs every 6 weeks). On price, ads and device support there is nothing between them.

Both are free to download. Defense Factory sells 9 one-off in-app purchases. BUMPY UFO asks for nothing beyond the download.

BUMPY UFO ships an update every 6 weeks, Defense Factory every 2 days. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | BUMPY UFO | Defense Factory |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/defense-factory-tower-defense/id6479639673/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 6 weeks | **Every 2 days** |
| Monetization | — | Free with in-app purchases |
| Size | 48 MB | 210 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [KAEGUREE](https://appshunter.io/developer/1183810155) | [Andrew Quoc Tran](https://appshunter.io/developer/1732511776) |

## What reviewers say

### BUMPY UFO

[App page](https://appshunter.io/ios/app/bumpy-ufo/id1503435478)

**Features:** macOS Compatibility

**In-app purchases:** none


### Defense Factory

[App page](https://appshunter.io/ios/app/defense-factory-tower-defense/id6479639673)

This game blends tower defense with incremental mechanics, where your tower acts as a factory spawning minions to battle invaders. Evolve your army, research upgrades, and compete in tournaments to defend your territory.

**Highlights:** Minion-spawning tower defense, Evolving minion army, Factory production upgrades, Card collection bonuses, Live tournament competitions, Research new upgrades

**Features:** macOS Compatibility

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 100 Gems | $4.99 | one-time |
| 225 Gems | $9.99 | one-time |
| Premium Pass 1 | $9.99 | one-time |
| Starter Pack | $9.99 | one-time |
| 500 Gems | $19.99 | one-time |
| 800 Gems | $29.99 | one-time |
| Master Pack | $29.99 | one-time |
| 1400 Gems | $49.99 | one-time |
| 3000 Gems | $99.99 | one-time |


## Frequently asked questions

### Is BUMPY UFO free?

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

### Is Defense Factory free?

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

### Do BUMPY UFO or Defense Factory have ads?

Both BUMPY UFO and Defense Factory show ads.

### Which is updated more often, BUMPY UFO or Defense Factory?

BUMPY UFO ships an update every 6 weeks, and Defense Factory every 2 days. Most recently, BUMPY UFO was updated on November 3, 2026 and Defense Factory on November 4, 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.*