167+ iOS apps & games curated and reviewed
With an average user rating of 4.5★, the outer space defense category is one of the App Store's strongest. Browse all 167+ apps and games we track, sorted so the most loved ones surface first.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 |  | $0.99 | — | No | No | May 2026 |
| 2 |  | Free | 4.7★ (652K) | Yes | Yes | Aug 2026 |
| 3 |  | Free | 4.8★ (9K) | Yes | Yes | Aug 2026 |
| 4 |  | Free | 3.8★ (12) | No | Yes | May 2026 |
| 5 |  | Free | 4.8★ (1.8K) | Yes | Yes | Aug 2026 |
| 6 |  | Free | 4.7★ (3.8K) | No | Yes | Aug 2026 |
| 7 |  | Free | 4.8★ (561) | Yes | Yes | Aug 2026 |
| 8 |  | Free | 4.2★ (134) | No | Yes | Aug 2026 |
Pilot a lone spaceship to defend Earth from relentless alien swarms in this classic space shooter. Upgrade your weapons and skills to overcome increasingly difficult challenges across numerous levels and intense boss battles.
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.
Defend Earth from alien invaders by strategically deploying and upgrading cannons and special weapons. This addictive game challenges your judgment and quick thinking to protect your bunker from increasingly powerful enemies.
Engage in real-time strategy to defend your base against relentless enemy waves. Build, upgrade, and deploy a variety of units with precise timing to survive epic battles in space. Master strategic decisions to overcome increasingly difficult challenges.
Build and command your own space station and fleet in a chaotic galaxy. Forge alliances, explore new worlds, and engage in strategic space battles to shape the future of the sector. Your decisions will determine the fate of the galaxy.
Command a galactic defense to protect your space tower from alien invaders. Strategically upgrade your tower's abilities and weapons to withstand relentless waves of enemies and defeat powerful bosses. Enjoy idle gameplay with ample rewards, even while offline.
Defend your space fortress against alien invasions in this vibrant defense game. Strategically build your base, deploy a variety of weapons and traps, and customize enemy paths to survive hundreds of waves. Compete for high scores in an online hall of fame.
Defend your space outpost from relentless enemy waves in this idle tower defense game. Upgrade your warship, deploy powerful towers, and unlock advanced weapons to survive galactic battles. Conquer star systems and climb leaderboards in an immersive sci-fi experience.
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.
Engage in strategic orbital tower defense with minimalist visuals and dynamic music. Place, merge, and upgrade weapons to defend satellites across various planets and moons from relentless enemy waves. Collect diverse weapons and trait cards to build your ultimate defense strategy.
Build and command your own space colony, construct a powerful fleet, and engage in epic interstellar warfare. Explore a vast universe, battle pirates or other players, and forge alliances to achieve galactic dominance.
Engage in alien invasion PvP combat with diverse character classes and unique abilities. Explore new galaxies, upgrade weapons, and battle giant bosses in this action-packed top-down shooter.
Manage your own space agency, from designing and building rockets to launching missions for research, mining, or tourism. Explore planets and moons, establish off-world economies, and advance your technology in this interplanetary simulation.
Defend planetary bases from raiders in a futuristic space war. Pilot advanced robots, tanks, and ships, utilizing a variety of weapons and upgrades to destroy enemy forces across different worlds. Complete challenging missions to earn rewards and become a top defender.
Engage in intense galactic arcade battles to defend your starbase from alien invaders. Upgrade your fleet, build a powerful military force, and conquer the universe. Explore, build, and fight your way to becoming a legendary space hero.
Engage in an epic top-down space shooter that blends tower defense, bullet hell, and RPG elements. Mine asteroids, research technologies, and customize your ship with a vast array of weapons and abilities to battle robot hordes. Explore a compelling story mode or test your skills in endless and challenge modes.
Explore a galaxy in chaos, building and customizing spaceships to battle endless enemy hordes. Investigate different worlds and uncover a developing story to restore order.
Engage in epic galactic warfare with players worldwide in this next-generation online space strategy game. Build and customize your space station, design powerful fleets, and form alliances to conquer sectors of space. Experience real-time battles and strategic gameplay with stunning HD graphics.
Unleash your destructive power on planets with a vast arsenal of weapons. From nuclear missiles and lasers to monstrous creatures and asteroids, obliterate celestial bodies in this engaging simulator.