160+ iOS apps & games curated and reviewed
The best space defense apps on iPhone average 4.5★ across 160+ titles — we've ranked them by what real users actually keep on their phones. Updated July 2026.
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.
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.
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 an adventurous competitive mobile game where you conquer planets by drawing lines. Experience exciting gameplay with multi-level challenges and fantasy props to create effective combinations for a high-quality gaming experience.
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 in this tower defense game with a roguelike card system. Build and upgrade futuristic weapons, adapt your strategy with unique card choices, and face waves of diverse enemies and bosses. Every playthrough offers a new, unpredictable challenge.
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.
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.
Engage in a classic tower defense experience with strategic gameplay and action-packed battles. Explore diverse campaigns, challenging maps, and unique towers to defeat various enemies across multiple world themes. Enjoy a highly-rated defense game with regular updates.
Engage in strategic space battles defending the galaxy from alien invaders. Utilize powerful towers, research advanced weapons, and employ tactical cards to outwit diverse enemies. Master resource management and upgrade your defenses to become the ultimate cosmic guardian.
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 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.
Defend against waves of angry aliens in this adventure space game. Choose your ship, combine skill cards and bots, and strategically upgrade weapons to survive increasingly dangerous levels. Enjoy fast-paced, automatic gameplay perfect for on-the-go play.
Defend Earth from an alien invasion as a heroic defender wielding an energy cannon. Quickly stop the advance of the Hummer and its minions to preserve global peace.
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.
Engage in an offline, single-player 2D space real-time strategy game. Overcome overwhelming odds by making difficult strategic choices, sacrificing planets to bolster your fleet, or fortifying your defenses. Enjoy diverse units, configurable AI, and a unique desperation mechanic.
Defend the galaxy from alien invaders in this sci-fi tower defense game. Strategically deploy futuristic towers, upgrade your arsenal, and adapt to waves of unique monsters. Your tactical decisions will determine humanity's fate.
Defend Earth from an approaching asteroid storm in this thrilling strategy game. Utilize a variety of satellites, shields, and upgrade systems to destroy incoming threats and achieve a high defense rating. Experiment with different weapons and tools across multiple viewing perspectives to save the planet.
Lead humanity's fight for survival in a zombie-infested world. Build armies, form alliances, and reclaim civilization block by block. Strategize on a real 3D map to crush rivals and lead the new age.