Astro Builder vs Rail Defence
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Astro Builder
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.
- Idle space station construction
- Resource management
- Unlock new equipment
- Expand and develop areas
- Space elevator material transport
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Welcome to Astro Builder, the ultimate casual idle game where you construct a space station in near-Earth orbit. Begin with a simple setup—a connecting ground track and a small platform. Material is transported to the platform via a space elevator and piled on the ground. Utilize the resources to expand and improve the platform, unlocking new equipment and producing valuable resources. Each construction phase reveals a new area, waiting to be developed and unlocked. Can you build the ultimate space station and conquer the cosmos?
Rail Defence
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.
- Circular railway defense
- Acquire new weapons
- Upgrade weapons
- Strengthen defenses
- Special powers
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Defend your castle on a circular railway. Acquire new weapons as you gain experience. Strengthen your weapons and keep increasingly larger enemies away from your castle. Strengthen your defences by using special powers and weapons.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Astro Builder | Rail Defence |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (3.3K ratings) — better | 4.1 (1.1K ratings) |
| Positive reviews | 34.1% of reviews — better | 1.7% of reviews |
| Number of ratings | 3.3K — better | 1.1K |
| Update frequency | Every 11 months | Fortnightly — better |
| Ads | Yes | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 251 MB | 156 MB |
| Age rating | 4+ | 4+ |
| Developer | Solid Games | Upperpik Oyun Yazilim ve Pazarlama Ticaret Anonim Sirketi |
Customer experience
Astro Builder
Rail Defence
User reviews
Astro Builder
From 3.3K App Store ratingsWhat we love
- 🚀 Fun game concept
- 👍 Detailed space station building
- 💡 Customizable astronaut suits
Room to improve
- 🐛 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
Rail Defence
From 1.1K App Store ratingsWhat we love
- 🚀 Hack
Room to improve
- 🐛 Glitches
- 💸 Obscene amount of Ads
- 💸 Advertisement Simulator
- 💸 Ads Ads & more Ads
- 💸 Ads
Bugs and requests
Astro Builder
Reported bugs
3 issues- Builders getting stuck or ignoring resource needs
- Inconsistent behavior when collecting from processors
- Permanent worker upgrades not functioning properly
Requested features
4 requests- Ability to continue progress offline
- More varied level designs and challenges
- Autonomous builder behavior
- Background progress while app is closed
Rail Defence
Reported bugs
3 issues- The bomb does not work after a few seconds
- Randomly the weapons won't work
- The crossbow stops working after a while
Requested features
3 requests- More levels
- Different zombies
- More upgrades
In-app purchases
Astro Builder
- AD TICKETS 10$0.99
- AD TICKETS 25$1.99
- AD TICKETS 60$3.99
Show 2 moreShow fewer
- Ad-free 7 day$4.99
- Permanent ad-free!$9.99
Rail Defence
- Cash kickstart pack$1.99
- 10 Tickets$1.99
- Manager$2.99
Show 15 moreShow fewer
- Money Fountain Pack$2.99
- Engineer$2.99
- 20 Tickets$2.99
- Big Deal Pack$3.99
- Financier$3.99
- Royal Treasury Pack$4.99
- 50 Tickets$4.99
- No Ads$4.99
- Bundle$5.99
- Treasury Trove Pack$5.99
- 30 Tickets and No Ads$5.99
- Mega Bundle$7.99
- Big Vault Pack$8.99
- Ultra Bundle$10.99
- Big Chest Treasure$11.99
Questions
Is Astro Builder free?
Is Rail Defence free?
Which has better reviews, Astro Builder or Rail Defence?
Do Astro Builder or Rail Defence have ads?
Which is updated more often, Astro Builder or Rail Defence?
Other comparisons
