# Astro Builder vs Rail Defence

The clearest difference is rating: Astro Builder at 4.7 against Rail Defence's 4.1. Astro Builder also leads on review sentiment (34% vs 2%) and ratings volume (3.3K vs 1.1K). Rail Defence's advantage is update cadence (fortnightly vs every 11 months) and iOS requirement (13.0 vs 15.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Astro Builder sells 5 one-off in-app purchases and Rail Defence sells 18 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Astro Builder holds the better App Store score, 4.7 against 4.1. Both are backed by a comparable volume of ratings — 3.3K and 1.1K respectively. Written reviews point the same way: 34% of Astro Builder's written reviews are positive against 2% of Rail Defence's.

Astro Builder ships an update every 11 months, Rail Defence fortnightly. The most recent releases landed on October 19, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Astro Builder | Rail Defence |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (3.3K ratings)](https://appshunter.io/ios/app/astro-builder/id6737761200/reviews)** | [4.1 (1.1K ratings)](https://appshunter.io/ios/app/rail-defence/id6739333810/reviews) |
| Number of ratings | **3.3K** | 1.1K |
| Positive reviews | **34.1% of reviews** | 1.7% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 11 months | **Fortnightly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 251 MB | 156 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Solid Games](https://appshunter.io/developer/1625798412) | [Upperpik Oyun Yazilim ve Pazarlama Ticaret Anonim Sirketi](https://appshunter.io/developer/1225221447) |

## What reviewers say

### Astro Builder

[App page](https://appshunter.io/ios/app/astro-builder/id6737761200)

Build a sprawling space station in orbit with this idle construction game. Start with basic components and expand your facility by unlocking new equipment and generating resources. Discover and develop new areas as your station grows.

**Highlights:** Idle space station construction, Resource management, Unlock new equipment, Expand and develop areas, Space elevator material transport

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AD TICKETS 10 | $0.99 | one-time |
| AD TICKETS 25 | $1.99 | one-time |
| AD TICKETS 60 | $3.99 | one-time |
| Ad-free 7 day | $4.99 | one-time |
| Permanent ad-free! | $9.99 | one-time |

**What reviewers like**

- 🚀 Fun game concept
- 👍 Detailed space station building
- 💡 Customizable astronaut suits

**What reviewers complain about**

- 🐛 Buggy AI and builder behavior
- 🔇 Lack of sound and music
- 🔁 Repetitive and monotonous gameplay
- 🔒 Forced ads and limited free content
- ⏱️ Slow progress without watching ads

**Reported bugs**

- Builders getting stuck or ignoring resource needs
- Inconsistent behavior when collecting from processors
- Permanent worker upgrades not functioning properly

**Requested features**

- Ability to continue progress offline
- More varied level designs and challenges
- Autonomous builder behavior
- Background progress while app is closed


### Rail Defence

[App page](https://appshunter.io/ios/app/rail-defence/id6739333810)

Defend your castle from waves of enemies by strategically placing and upgrading weapons on a circular railway. Utilize special powers and enhanced armaments to repel increasingly formidable foes and protect your stronghold.

**Highlights:** Circular railway defense, Acquire new weapons, Upgrade weapons, Strengthen defenses, Special powers

**Features:** macOS Compatibility

**In-app purchases (18)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Cash kickstart pack | $1.99 | one-time |
| 10 Tickets | $1.99 | one-time |
| Manager | $2.99 | one-time |
| Money Fountain Pack | $2.99 | one-time |
| Engineer | $2.99 | one-time |
| 20 Tickets | $2.99 | one-time |
| Big Deal Pack | $3.99 | one-time |
| Financier | $3.99 | one-time |
| Royal Treasury Pack | $4.99 | one-time |
| 50 Tickets | $4.99 | one-time |
| No Ads | $4.99 | one-time |
| Bundle | $5.99 | one-time |
| Treasury Trove Pack | $5.99 | one-time |
| 30 Tickets and No Ads | $5.99 | one-time |
| Mega Bundle | $7.99 | one-time |
| Big Vault Pack | $8.99 | one-time |
| Ultra Bundle | $10.99 | one-time |
| Big Chest Treasure | $11.99 | one-time |

**What reviewers like**

- 🚀 Hack

**What reviewers complain about**

- 🐛 Glitches
- 💸 Obscene amount of Ads
- 💸 Advertisement Simulator
- 💸 Ads Ads & more Ads
- 💸 Ads

**Reported bugs**

- The bomb does not work after a few seconds
- Randomly the weapons won't work
- The crossbow stops working after a while

**Requested features**

- More levels
- Different zombies
- More upgrades


## Frequently asked questions

### Is Astro Builder free?

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

### Is Rail Defence free?

Rail Defence is free to download, with in-app purchases available.

### Which has better reviews, Astro Builder or Rail Defence?

Astro Builder is rated higher. Astro Builder averages 4.7 out of 5 from 3.3K ratings, while Rail Defence averages 4.1 from 1.1K ratings.

### Do Astro Builder or Rail Defence have ads?

Both Astro Builder and Rail Defence show ads.

### Which is updated more often, Astro Builder or Rail Defence?

Astro Builder ships an update every 11 months, and Rail Defence fortnightly. Most recently, Astro Builder was updated on October 19, 2026 and Rail Defence on October 21, 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.*