# Invaders Legacy vs Alien Attack Idle Simulator 3D

The clearest difference is update cadence: Alien Attack Idle Simulator 3D at every 4 days against Invaders Legacy's every 2 weeks. Alien Attack Idle Simulator 3D also leads on iOS requirement (13.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Invaders Legacy sells 16 one-off in-app purchases and Alien Attack Idle Simulator 3D sells 11 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Invaders Legacy ships an update every 2 weeks, Alien Attack Idle Simulator 3D every 4 days. The most recent releases landed on September 25, 2026 and May 16, 2026 respectively.

## The numbers

| Metric | Invaders Legacy | Alien Attack Idle Simulator 3D |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.5 (107 ratings)](https://appshunter.io/ios/app/invaders-legacy-alien-games/id6673911718/reviews)** | — |
| Number of ratings | **107** | — |
| Positive reviews | 20.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 2 weeks | **Every 4 days** |
| Monetization | Free with in-app purchases | — |
| Size | 344 MB | 175 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 9+ | 4+ |
| Developer | [Roasup, Inc.](https://appshunter.io/developer/1447937110) | [APPWILL COMPANY LTD](https://appshunter.io/developer/1761313938) |

## What reviewers say

### Invaders Legacy

[App page](https://appshunter.io/ios/app/invaders-legacy-alien-games/id6673911718)

Defend against an alien invasion in this RPG where you gather resources, upgrade your spaceship, and battle waves of extraterrestrial foes. Craft powerful upgrades and unlock new abilities to survive the relentless assault and claim victory in this captivating space adventure.

**Highlights:** Gather resources from diverse locations, Enhance and upgrade your spaceship, Engage in epic battles against alien invaders, Craft powerful upgrades, Unlock new spaceship abilities, Classic space invaders gameplay with RPG elements

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

**In-app purchases (16)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Handful of crystals | $1.99 | one-time |
| 10 Tickets | $2.99 | one-time |
| 20 Tickets | $4.99 | one-time |
| Bunch of crystals | $5.99 | one-time |
| Starter Pack | $5.99 | one-time |
| 35 Tickets | $7.99 | one-time |
| No Ad | $7.99 | one-time |
| Pile of crystals | $9.99 | one-time |
| Small bundle | $12.99 | one-time |
| 60 Tickets | $12.99 | one-time |
| 90 Tickets | $19.99 | one-time |
| Medium bundle | $27.99 | one-time |
| Pouch of crystals | $29.99 | one-time |
| 260 Tickets | $49.99 | one-time |
| Bag of crystals | $59.99 | one-time |
| Large bundle | $119.99 | one-time |

**What reviewers like**

- 🚀 No forced ads
- 👍 Good game concept
- 🚀 Short ads

**What reviewers complain about**

- 🐛 Bugs and glitches
- 🐛 Quests not working properly
- 🐛 In-app purchases not working
- 🐛 Second farm not functioning
- 🐛 Progression issues

**Reported bugs**

- Quests not registering as complete
- Buildings not rebuilding properly
- Soldiers getting stuck in the air
- Purchases not being delivered
- Pricing discrepancies

**Requested features**

- More quests and content
- New map and upgradeable ship parts
- Better customer support


### Alien Attack Idle Simulator 3D

[App page](https://appshunter.io/ios/app/alien-attack-idle-simulator-3d/id6686404136)

**Features:** macOS Compatibility

**In-app purchases (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Little kit with currencys | $1.99 | one-time |
| Classic starter pack | $1.99 | one-time |
| Premium personalized kit | $1.99 | one-time |
| Premium starter pack | $3.29 | one-time |
| All premium starter pack | $3.69 | one-time |
| Medium kit with currencys | $5.49 | one-time |
| 600 Crystals | $7.39 | one-time |
| Big kit with currencys | $8.99 | one-time |
| All kit with currencys | $9.29 | one-time |
| 1100 Crystals | $12.99 | one-time |
| 1000 Crystals | $12.99 | one-time |


## Frequently asked questions

### Is Invaders Legacy free?

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

### Is Alien Attack Idle Simulator 3D free?

Alien Attack Idle Simulator 3D is free to download, with in-app purchases available.

### Do Invaders Legacy or Alien Attack Idle Simulator 3D have ads?

Both Invaders Legacy and Alien Attack Idle Simulator 3D show ads.

### Which is updated more often, Invaders Legacy or Alien Attack Idle Simulator 3D?

Invaders Legacy ships an update every 2 weeks, and Alien Attack Idle Simulator 3D every 4 days. Most recently, Invaders Legacy was updated on September 25, 2026 and Alien Attack Idle Simulator 3D on May 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.*