# UnderAttack vs Grid Defense

The clearest difference is ads: Grid Defense at none against UnderAttack's shown. Grid Defense also leads on update cadence (every 2 weeks vs every 4 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. UnderAttack sells 9 one-off in-app purchases and Grid Defense sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UnderAttack ships an update every 4 months, Grid Defense every 2 weeks. The most recent releases landed on October 6, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | UnderAttack | Grid Defense |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 2 weeks** |
| Size | 88 MB | 10 MB |
| Requires iOS | 16.4 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 9+ |
| Developer | [OGULCAN SACLI](https://appshunter.io/developer/1855149869) | [Dimitar Porkov](https://appshunter.io/developer/6790099306) |

## What reviewers say

### UnderAttack

[App page](https://appshunter.io/ios/app/underattack-idle-td/id6756351933)

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

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 50 Gem | $0.99 | one-time |
| 130 Gem | $1.99 | one-time |
| Starter Pack | $2.99 | one-time |
| Adventurer Bundle | $4.99 | one-time |
| 350 Gem | $4.99 | one-time |
| 650 Gem | $7.99 | one-time |
| Veteran Pack | $9.99 | one-time |
| Dreadnought | $9.99 | one-time |
| 1500 Gem | $14.99 | one-time |


### Grid Defense

[App page](https://appshunter.io/ios/app/grid-defense/id6790099304)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Game Unlock | $1.99 | one-time |


## Frequently asked questions

### Is UnderAttack free?

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

### Is Grid Defense free?

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

### Do UnderAttack or Grid Defense have ads?

UnderAttack shows ads; Grid Defense does not.

### Which is updated more often, UnderAttack or Grid Defense?

UnderAttack ships an update every 4 months, and Grid Defense every 2 weeks. Most recently, UnderAttack was updated on October 6, 2026 and Grid Defense on September 26, 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.*