# Alien Robot Defender vs Chain Stacker

The clearest difference is ads: Alien Robot Defender at none against Chain Stacker's shown. Alien Robot Defender also leads on update cadence (every 2 months vs every 31 months) and monetization model (free vs ad-supported). On price, rating, ratings volume and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for Alien Robot Defender against 5.0 for Chain Stacker. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Alien Robot Defender ships an update every 2 months, Chain Stacker every 31 months. The most recent releases landed on October 7, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Alien Robot Defender | Chain Stacker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/alien-robot-defender/id460633266/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/chain-stacker/id1600024125/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 2 months** | Every 31 months |
| Monetization | **Free** | Ad-supported |
| Size | 11 MB | 79 MB |
| Requires iOS | **6.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Mike Hempfling](https://appshunter.io/developer/422781074) | [omer cetin](https://appshunter.io/developer/1584332419) |

## What reviewers say

### Alien Robot Defender

[App page](https://appshunter.io/ios/app/alien-robot-defender/id460633266)

Engage in a classic side-scrolling shooter experience, battling waves of alien robots. Your mission is to eliminate invaders, unlock progressively challenging levels, and achieve a high score. Master diverse robot movement patterns to succeed.

**Highlights:** Side-scrolling gameplay, Battle alien robots, Unlock new levels, High score challenges, Easy controls, 40 challenging levels

**Features:** macOS Compatibility

**In-app purchases:** none


### Chain Stacker

[App page](https://appshunter.io/ios/app/chain-stacker/id1600024125)

A unique jewelry-making game where you stack chains and fill them with jewels. Enhance your chains with precious metals and gems to increase their value. Compete to become the richest by making the best offers at the end of each level.

**Highlights:** Stack chains, Fill chains with jewels, Enhance chains with silver, gold, and diamonds, Increase chain value, Make offers to become rich

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Alien Robot Defender free?

Alien Robot Defender is free to download, with no in-app purchases.

### Is Chain Stacker free?

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

### Which has better reviews, Alien Robot Defender or Chain Stacker?

Alien Robot Defender and Chain Stacker are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do Alien Robot Defender or Chain Stacker have ads?

Chain Stacker shows ads; Alien Robot Defender does not.

### Which is updated more often, Alien Robot Defender or Chain Stacker?

Alien Robot Defender ships an update every 2 months, and Chain Stacker every 31 months. Most recently, Alien Robot Defender was updated on October 7, 2026 and Chain Stacker on September 30, 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.*