# Rocket Invaders vs Train Defence

The clearest difference is in-app purchases: Train Defence at none against Rocket Invaders's 8. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Rocket Invaders sells 8 one-off in-app purchases. Train Defence asks for nothing beyond the download.

Rocket Invaders ships an update every 9 days, Train Defence weekly. The most recent releases landed on September 18, 2026 and August 23, 2026 respectively.

## The numbers

| Metric | Rocket Invaders | Train Defence |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.8 (9 ratings)](https://appshunter.io/ios/app/train-defence/id6754323589/reviews)** |
| Number of ratings | — | **9** |
| Positive reviews | — | 40.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 9 days | **Weekly** |
| Monetization | — | Ad-supported |
| Size | 258 MB | 154 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 9+ |
| Developer | [Krada Studio Corp](https://appshunter.io/developer/1821603226) | [SOZAP](https://appshunter.io/developer/952456051) |

## What reviewers say

### Rocket Invaders

[App page](https://appshunter.io/ios/app/rocket-invaders/id6747470112)

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Permanently Unlock All Weapons | $0.99 | one-time |
| Save Sector Progress | $0.99 | one-time |
| Faster Fuel Pipe Transfers | $0.99 | one-time |
| Slower Bonus Crate Expiry Time | $0.99 | one-time |
| Slower Wave Timers | $0.99 | one-time |
| Remove Ads & Extra Resource | $2.99 | one-time |
| Full Converters at New Planet | $2.99 | one-time |
| Rocket Mega Pack | $4.99 | one-time |


### Train Defence

[App page](https://appshunter.io/ios/app/train-defence/id6754323589)

Command an armored train in a post-apocalyptic desert war. Upgrade wagons, mount weapons, and blast through enemy convoys and massive bosses to survive. Rule the wasteland with your rolling fortress.

**Highlights:** Build and upgrade war train, Mount devastating weapons, Face massive boss fights, Smash through barriers, Battle raiders, Rule the wasteland

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

**In-app purchases:** none


## Frequently asked questions

### Is Rocket Invaders free?

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

### Is Train Defence free?

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

### Do Rocket Invaders or Train Defence have ads?

Both Rocket Invaders and Train Defence show ads.

### Which is updated more often, Rocket Invaders or Train Defence?

Rocket Invaders ships an update every 9 days, and Train Defence weekly. Most recently, Rocket Invaders was updated on September 18, 2026 and Train Defence on August 23, 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.*