# Gun Builder Simulator vs Idle Gun Assembly

The clearest difference is review sentiment: Gun Builder Simulator at 68% against Idle Gun Assembly's 0%. Gun Builder Simulator also leads on rating (4.3 vs 2.3) and ratings volume (307 vs 4). Idle Gun Assembly's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. Gun Builder Simulator sells 1 one-off in-app purchase. Idle Gun Assembly asks for nothing beyond the download.

Gun Builder Simulator holds the better App Store score, 4.3 against 2.3. That said, the two scores are not equally well evidenced: Gun Builder Simulator has 307 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 68% of Gun Builder Simulator's written reviews are positive against 0% of Idle Gun Assembly's.

Gun Builder Simulator ships an update every 5 months, Idle Gun Assembly every 11 days. The most recent releases landed on October 6, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Gun Builder Simulator | Idle Gun Assembly |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (307 ratings)](https://appshunter.io/ios/app/gun-builder-simulator/id1448602385/reviews)** | [2.3 (4 ratings)](https://appshunter.io/ios/app/idle-gun-assembly/id1524070862/reviews) |
| Number of ratings | **307** | 4 |
| Positive reviews | **67.6% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 5 months | **Every 11 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 95 MB | 106 MB |
| Requires iOS | 12.0 | **10.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 9+ |
| Developer | [Marijana Peric](https://appshunter.io/developer/1711240603) | [Studd Technology Solutions](https://appshunter.io/developer/928375431) |

## What reviewers say

### Gun Builder Simulator

[App page](https://appshunter.io/ios/app/gun-builder-simulator/id1448602385)

Explore a vast arsenal of realistic firearms, from assault rifles to pistols. Customize weapons with various attachments and experience authentic mechanics, including muzzle flashes and shell ejection. Enjoy unlimited ammo and simulation shooting with over 150 levels.

**Highlights:** Unlimited Ammo, Realistic Muzzle Flashes, 3D Ejecting Shells, Functional Attachments, Weapon Customization, Simulation Shooting, Shooting Range

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Version | $2.99 | one-time |


### Idle Gun Assembly

[App page](https://appshunter.io/ios/app/idle-gun-assembly/id1524070862)

Design, build, and upgrade unique weapons to destroy targets. Mix and match parts, paint your creations, and level up to unlock new components for maximum damage and in-game cash. Become the ultimate gunsmith in this idle simulation game.

**Highlights:** Design custom weapons, Mix and match gun parts, Paint weapon creations, Upgrade for maximum damage, Unlock new gun parts, Destroy insane targets

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Gun Builder Simulator free?

Gun Builder Simulator is free to download, with in-app purchases available.

### Is Idle Gun Assembly free?

Idle Gun Assembly is free to download, with no in-app purchases.

### Which has better reviews, Gun Builder Simulator or Idle Gun Assembly?

Gun Builder Simulator is rated higher. Gun Builder Simulator averages 4.3 out of 5 from 307 ratings, while Idle Gun Assembly averages 2.3 from 4 ratings.

### Do Gun Builder Simulator or Idle Gun Assembly have ads?

Gun Builder Simulator shows ads; Idle Gun Assembly does not.

### Which is updated more often, Gun Builder Simulator or Idle Gun Assembly?

Gun Builder Simulator ships an update every 5 months, and Idle Gun Assembly every 11 days. Most recently, Gun Builder Simulator was updated on October 6, 2026 and Idle Gun Assembly on October 7, 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.*