Best Tower Defense Space Apps & Games

247+ iOS apps & games curated and reviewed

4.4 avg rating
20 free apps & games
Updated September 2026

Out of 247+ tower defense space apps and games on iOS, 20 are free and the rest sit in the paid tier. This page sorts them so you can compare both sides before you commit.

Compare top Tower Defense Space Apps & Games (September 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Mega Tower - Casual TD GameMega Tower - Casual TD GameFree4.6★ (5.2K)YesYesSep 2026
2Planet Defense: Space TD gamePlanet Defense: Space TD gameFree4.6★ (2.6K)YesYesSep 2026
3Galaxy Defense: Fortress TDGalaxy Defense: Fortress TDFree4.7★ (9K)YesYesSep 2026
4Tower Defense: Infinite WarTower Defense: Infinite WarFree4.4★ (2.4K)YesYesSep 2026
5Space Takeover - Defense.ioSpace Takeover - Defense.ioFree4.8★ (4.9K)YesYesSep 2026
6Space Towers: Galactic DefenseSpace Towers: Galactic DefenseFreeNoYesJun 2026
7Tower Attack 3DTower Attack 3DFreeNoNoJun 2026
8Tower Defense of Fields: Greece Tower Defense of Homeworld Runners Sentinel GameTower Defense of Fields: Greece Tower Defense of Homeworld Runners Sentinel GameFree4.2★ (86)NoNoAug 2026

Top Picks for Tower Defense Space

Mega Tower - Casual TD Game#1

Mega Tower - Casual TD Game by HONG KONG YOULOFT TECHNOLOGY LIMITED

Merge your mega tower!
Editor's Choice
🎮 Games
4.6😊(5.2K ratings)
FreeAdsIn-App Purchases
Mega Tower - Casual TD Game screenshot 1
Mega Tower - Casual TD Game screenshot 2
Mega Tower - Casual TD Game screenshot 3
Mega Tower - Casual TD Game screenshot 4
Mega Tower - Casual TD Game screenshot 5

Build and merge towers to defend a planet in this casual strategy game. Strategically deploy and upgrade your defenses to conquer alien worlds. Experience thrilling sci-fi battles with endless challenges.

What We Love

  • 🚀 Addictive gameplay
  • 👍 Optional ads for rewards
  • 💡 Unique tower defense concept
  • 🚀 Steady progression for free-to-play players
  • 👍 Generous reward system

Room to Improve

  • 🐛 Crashes and freezes
  • 🐛 Bugs with ads and rewards
  • 🐛 Lost progress and account issues
  • 🔋 Frequent updates causing more problems
  • 💰 Expensive in-app purchases for progression
Planet Defense: Space TD game#2

Planet Defense: Space TD game by CYBERJOY LIMITED

Galactic TD Strategy
Strong Contender
🎮 Games
4.6😞(2.6K ratings)
FreeAdsIn-App Purchases
Planet Defense: Space TD game screenshot 1
Planet Defense: Space TD game screenshot 2
Planet Defense: Space TD game screenshot 3
Planet Defense: Space TD game screenshot 4
Planet Defense: Space TD game screenshot 5
Planet Defense: Space TD game screenshot 6

Defend your home planet in this roguelike tower defense game. Build and upgrade defenses to fend off alien invaders. Experience deep strategy with unique playthroughs and unlockable sentinels.

What We Love

  • 👍 Enjoyable gameplay
  • 🌟 Beautiful graphics

Room to Improve

  • ⏱️ Slow progression and upgrades
  • 🐛 Frequent crashes and freezes
  • 💰 Heavily pay-to-play model
  • 📺 Excessive ads interrupting gameplay
Galaxy Defense: Fortress TD#3

Galaxy Defense: Fortress TD by CYBERJOY LIMITED

Defend Planet, Beat Aliens!
Worth Considering
🎮 Games
4.7😞(9K ratings)
FreeAdsIn-App Purchases
#60in Games
Galaxy Defense: Fortress TD screenshot 1
Galaxy Defense: Fortress TD screenshot 2
Galaxy Defense: Fortress TD screenshot 3
Galaxy Defense: Fortress TD screenshot 4
Galaxy Defense: Fortress TD screenshot 5
Galaxy Defense: Fortress TD screenshot 6

Defend Earth from alien invaders in this idle tower defense game. Build diverse turrets, strategize your defense, and power up your character with unique skills and weapons. Collect resources and take on global challenges to protect the planet.

What We Love

  • 🎮 Addictive gameplay
  • 🎨 Vibrant visuals
  • 🕹️ Engaging tower defense mechanics

Room to Improve

  • 💰 Monetization issues
  • 🤯 Difficulty spikes
  • 🕰️ Slow progression without spending

More Tower Defense Space apps to explore

FAQ about Tower Defense Space

What are the best tower defense space apps & games for iPhone?
Mega Tower - Casual TD Game tops our tower defense space apps & games ranking as of September 2026, with a 4.6-star average from 5.2K App Store ratings, and it's free to download.
Yes — 20 of the top tower defense space apps & games we rank are free to download, including Mega Tower - Casual TD Game and Planet Defense: Space TD game.
Mega Tower - Casual TD Game shows ads and offers in-app purchases, according to its App Store listing as of September 2026.
We track 247+ tower defense space apps & games on the iOS App Store as of September 2026, ranked by rating, recency, and analysis of real user reviews.
Mega Tower is a casual tower defense game with idle elements. Players build and merge towers to defend a planet, strategically deploying them to conquer alien worlds. It combines strategic thinking with satisfying progression.
You can get stronger by merging identical towers to create more powerful ones and by modifying their modules. Constructing and upgrading your colony planet also helps in gaining more resources, which can be used to enhance your defenses.