# Robot Factory vs Stack Attack!!

The clearest difference is ads: Robot Factory at none against Stack Attack!!'s shown. Stack Attack!!'s advantage is update cadence (every 2 weeks vs every 15 months) and ratings volume (399 vs 7). On price, rating, in-app purchases and monetization model there is nothing between them.

Both are free to download. Robot Factory sells 9 one-off in-app purchases and Stack Attack!! sells 19 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.4 for Robot Factory against 4.3 for Stack Attack!!. That said, the two scores are not equally well evidenced: Stack Attack!! has 399 ratings behind it against 7, so its average is the more settled of the two.

Robot Factory ships an update every 15 months, Stack Attack!! every 2 weeks. The most recent releases landed on October 29, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Robot Factory | Stack Attack!! |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (7 ratings)](https://appshunter.io/ios/app/robot-factory-merge-mecha/id6475427506/reviews)** | [4.3 (399 ratings)](https://appshunter.io/ios/app/stack-attack/id6566190313/reviews) |
| Number of ratings | 7 | **399** |
| Positive reviews | — | 23.2% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 15 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 89 MB | 247 MB |
| Requires iOS | 15.0 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Bohdan Savchenko](https://appshunter.io/developer/1658851388) | [Voodoo](https://appshunter.io/developer/714804730) |

## What reviewers say

### Robot Factory

[App page](https://appshunter.io/ios/app/robot-factory-merge-mecha/id6475427506)

Merge and upgrade futuristic robots and transformers in a bustling factory. Build a powerful mecha army, collect coins, and dominate the battlefield with classic clicker and merge mechanics. Defend your empire and conquer foes in this sci-fi idle adventure.

**Highlights:** Mecha Fusion and Upgrades, Robots Factory Management, Collect Coins and Craft, Strategic Battlefield Defense, Idle Game Mechanics, Sci-Fi Robot Warfare

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

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 60 Gems | $0.99 | one-time |
| 150 Gems | $1.99 | one-time |
| Special offer 2 | $1.99 | one-time |
| Remove all ads | $2.99 | one-time |
| 400 Gems | $2.99 | one-time |
| Special Offer | $4.99 | one-time |
| 1000 Gems | $4.99 | one-time |
| 3000 Gems | $6.99 | one-time |
| 10000 Gems | $12.99 | one-time |


### Stack Attack!!

[App page](https://appshunter.io/ios/app/stack-attack/id6566190313)

Engage in intense battles against waves of enemies, strategically demolishing their formations with powerful weapons. Upgrade your capabilities by selecting the best skills to protect the cube world from a malevolent hex invasion.

**Highlights:** Defeat enemy waves, Demolish enemy stacks, Upgrade skills, Save the cube world, Space invader gameplay

**Features:** macOS Compatibility

**In-app purchases (19)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Gem Pack Small | $0.99 | one-time |
| Gold Pack Small | $0.99 | one-time |
| Starter Pack | $2.99 | one-time |
| No Ads | $2.99 | one-time |
| Gem Pack Medium | $4.99 | one-time |
| 2X Speed! | $4.99 | one-time |
| Gold Pack Medium | $4.99 | one-time |
| Skip'its Medium Pack | $5.99 | one-time |
| Gem Pack Large | $9.99 | one-time |
| Gold Pack Large | $9.99 | one-time |
| Premium Pass | $14.99 | one-time |
| Gem Pack XL | $19.99 | one-time |
| Skip'its Large Pack | $19.99 | one-time |
| Gold Pack XL | $19.99 | one-time |
| Diamond Hero | $29.99 | one-time |
| Gem Pack XXL | $49.99 | one-time |
| Gold Pack XXL | $49.99 | one-time |
| Gem Pack XXXL | $99.99 | one-time |
| Gold Pack XXXL | $99.99 | one-time |

**What reviewers like**

- 👍 Simple and fun gameplay
- 🚀 No ads or microtransactions
- 💡 Nice armor upgrade system

**What reviewers complain about**

- 🐛 Glitches and bugs, especially after updates
- 🐛 Progress and upgrades getting reset or lost
- 🐛 Levels becoming unplayable after a certain point

**Reported bugs**

- Enemies' health scaling with player's attack power
- Levels freezing or getting stuck at checkpoints
- Weapon and upgrade levels getting downgraded randomly

**Requested features**

- Mute sound effects option
- Better communication from developers about updates
- More content and stages to progress through


## Frequently asked questions

### Is Robot Factory free?

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

### Is Stack Attack!! free?

Stack Attack!! is free to download, with in-app purchases available.

### Which has better reviews, Robot Factory or Stack Attack!!?

Robot Factory is rated higher. Robot Factory averages 4.4 out of 5 from 7 ratings, while Stack Attack!! averages 4.3 from 399 ratings.

### Do Robot Factory or Stack Attack!! have ads?

Stack Attack!! shows ads; Robot Factory does not.

### Which is updated more often, Robot Factory or Stack Attack!!?

Robot Factory ships an update every 15 months, and Stack Attack!! every 2 weeks. Most recently, Robot Factory was updated on October 29, 2026 and Stack Attack!! on October 22, 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.*