# Merge Defense 3D! vs Stack Attack!!

The clearest difference is rating: Stack Attack!! at 4.3 against Merge Defense 3D!'s 3.7. Stack Attack!! also leads on update cadence (every 2 weeks vs every 3 weeks). On price, review sentiment, ratings volume and ads there is nothing between them.

Both are free to download. Merge Defense 3D! sells 5 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.

Stack Attack!! holds the better App Store score, 4.3 against 3.7. Both are backed by a comparable volume of ratings — 1.1K and 399 respectively. Written reviews complicate that: 29% of Merge Defense 3D!'s written reviews are positive against 23% of Stack Attack!!'s, so the app with the better star average is not the one people write more warmly about.

Merge Defense 3D! ships an update every 3 weeks, Stack Attack!! every 2 weeks. The most recent releases landed on October 29, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Merge Defense 3D! | Stack Attack!! |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (1.1K ratings)](https://appshunter.io/ios/app/merge-defense-3d/id1490412270/reviews) | **[4.3 (399 ratings)](https://appshunter.io/ios/app/stack-attack/id6566190313/reviews)** |
| Number of ratings | **1.1K** | 399 |
| Positive reviews | **28.8% of reviews** | 23.2% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 157 MB | 247 MB |
| Requires iOS | **13.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Tatem Games Inc.](https://appshunter.io/developer/1259148330) | [Voodoo](https://appshunter.io/developer/714804730) |

## What reviewers say

### Merge Defense 3D!

[App page](https://appshunter.io/ios/app/merge-defense-3d/id1490412270)

A turn-based tower defense game where players strategically place and merge defenders to fend off advancing enemy blocks. It offers offline play and a challenging puzzle experience for a daring mind.

**Highlights:** Turn-based gameplay, Merge defenders to upgrade, Strategic placement, Offline play, Challenging puzzle, Power-ups and unlocks

**Features:** Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pack of Gems | $0.99 | one-time |
| Double Gems | $1.99 | one-time |
| Remove Ads | $2.99 | one-time |
| Promo Bundle | $3.99 | one-time |
| Big Promo Bundle | $6.99 | one-time |

**What reviewers like**

- ⭐ Good game concept
- 🎮 Enjoyable gameplay
- 💎 Addictive

**What reviewers complain about**

- 💸 Excessive ads
- 🔁 Ads interrupt gameplay
- 🔒 Paid ad-free version doesn't work
- 🐛 Glitches and crashes
- 🔋 Drains battery quickly

**Reported bugs**

- Paid ad-free version doesn't remove ads
- Game freezes during ads
- Progress lost when game crashes

**Requested features**

- Add 'End Turn' button
- Improve difficulty scaling past level 1000
- Increase max level for defense towers


### 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 Merge Defense 3D! free?

Merge Defense 3D! 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, Merge Defense 3D! or Stack Attack!!?

Stack Attack!! is rated higher. Merge Defense 3D! averages 3.7 out of 5 from 1.1K ratings, while Stack Attack!! averages 4.3 from 399 ratings.

### Do Merge Defense 3D! or Stack Attack!! have ads?

Both Merge Defense 3D! and Stack Attack!! show ads.

### Which is updated more often, Merge Defense 3D! or Stack Attack!!?

Merge Defense 3D! ships an update every 3 weeks, and Stack Attack!! every 2 weeks. Most recently, Merge Defense 3D! 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.*