# Galactic Missile Defense vs Operation

The clearest difference is in-app purchases: Operation at none against Galactic Missile Defense's 4. Operation also leads on update cadence (daily vs every 3 months) and review sentiment (100% vs 83%). Galactic Missile Defense's advantage is iOS requirement (11.0 vs 15.6). On price, ads and device support there is nothing between them.

Both are free to download. Galactic Missile Defense sells 4 one-off in-app purchases. Operation asks for nothing beyond the download.

Galactic Missile Defense ships an update every 3 months, Operation daily. The most recent releases landed on October 23, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Galactic Missile Defense | Operation |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.0 (1 ratings)](https://appshunter.io/ios/app/galactic-missile-defense/id737255889/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 83.3% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Daily** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 51 MB | 12 MB |
| Requires iOS | **11.0** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 9+ | 4+ |
| Developer | [Spyro Merianos](https://appshunter.io/developer/590519799) | [Boris Kravchenko](https://appshunter.io/developer/1700260082) |

## What reviewers say

### Galactic Missile Defense

[App page](https://appshunter.io/ios/app/galactic-missile-defense/id737255889)

Defend Earth from alien invaders in this strategic tower defense game. Deploy advanced missile systems and upgrade your bases to counter escalating attacks. Your strategic choices are crucial to saving the planet.

**Highlights:** Strategic tower defense gameplay, Variety of advanced missile weapons, Base upgrades and boosters, Escalating alien invasion levels, Engaging space combat scenarios

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pack of 25 Plasma | $1.99 | one-time |
| Pack of 150 Plasma | $9.99 | one-time |
| Pack of 250 Plasma | $19.99 | one-time |
| Pack of 800 Plasma | $49.99 | one-time |


### Operation

[App page](https://appshunter.io/ios/app/operation-invaders-from-space/id6738130147)

Pilot a spaceship to defend Earth from an alien invasion. Dodge enemy ships, collect star dust for points, and use onboard weapons to defeat the xenomorphs and save humanity.

**Highlights:** Spaceship combat, Alien invasion defense, Dodge enemy ships, Collect star dust, Use onboard weapons

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Galactic Missile Defense free?

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

### Is Operation free?

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

### Do Galactic Missile Defense or Operation have ads?

Neither Galactic Missile Defense nor Operation shows ads.

### Which is updated more often, Galactic Missile Defense or Operation?

Galactic Missile Defense ships an update every 3 months, and Operation daily. Most recently, Galactic Missile Defense was updated on October 23, 2026 and Operation on October 16, 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.*