164+ 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 164+ apps and games we track, sorted so the most loved ones surface first.
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.
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.
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.
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.
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.
Build and expand a space empire in a persistent, evolving galaxy. Colonize planets, research technology, command fleets, and engage in diplomacy and warfare with millions of players. Participate in cooperative and competitive missions to gather resources and dominate the cosmos.
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.
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 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.
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 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 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.
Defend an ancient stronghold from alien invaders using powerful technologies. Build and upgrade towers in a classic tower defense experience with unique levels and diverse enemies. Enjoy an offline, ad-free strategy game with a compelling storyline.
Build defenses and fight off alien monsters in your room. Tap to create structures and upgrade weapons to survive the invasion until darkness passes. Outlast the devil monsters to win.
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.
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.
Defend humanity's last hope by safeguarding vital research labs from relentless alien attacks. Strategically deploy and upgrade defenses, wield powerful weapons, and unleash special attacks to survive waves of cosmic adversaries. Explore mesmerizing planets and unlock new technologies to become a legendary defender.
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.