157+ iOS apps & games curated and reviewed
With an average user rating of 4.5★, the alien defense category is one of the App Store's strongest. Browse all 157+ apps and games we track, sorted so the most loved ones surface first.
Engage in fast-paced tower defense battles against alien invaders. Deploy a variety of towers, heroes, and infantry to defend Earth. Upgrade your defenses and strategize to overcome hordes of enemies across numerous levels and challenges.
Lead special forces against alien invaders in this strategy game. Command your troops to defend Area 51 and achieve victory against extraterrestrial hordes. Your strategic decisions are crucial for survival.
Defend your sheep from alien invaders in this classic 3D tower defense strategy game. Deploy a variety of upgradeable weapons and think fast to survive over 100 maps and endless waves of enemies. Compete with friends on global leaderboards.
Defend your flock from an alien invasion in this strategic tower defense game. Deploy a variety of updated and new weapons across numerous maps and campaigns. Utilize unique character abilities and optional in-app purchases to overcome challenging enemies and bosses.
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.
Command an alien and grow its army by defeating humans in this idle RPG. Evolve your alien with new abilities, upgrade its stats, and face challenging boss battles to achieve extraterrestrial dominance.
Defend cities from a relentless zombie horde in this idle defense game. Upgrade your arsenal with earned currency, unlock unique weapons and skills, and battle legendary bosses. It's an easy-to-learn, tough-to-master experience that tests your swiping and tapping skills.
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 your porch from waves of mutant creatures, aliens, and zombies using an arsenal of weapons and strategic upgrades. Survive over 540 levels across 11 episodes with intuitive tap and drag controls, even offline.
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 against endless zombie waves in this atmospheric strategy RPG. Equip heroes with weapons, upgrade them, and strategically battle hordes of the undead in a post-apocalyptic world. Test your skills against challenging bosses and become the ultimate zombie killer.
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.
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 your sheep from alien invaders by strategically placing and upgrading a variety of weapons. Engage in a unique 3D tower defense experience with over 100 maps and 17 alien types. Compete globally and replay your best games.
Defend your airspace in an intense arcade shooter against an alien invasion. Engage in fast-paced, vertical ground-to-air combat with realistic visuals and a thrilling story. Perfect for quick bursts of action.
Defend your interstellar farm from alien invasions by strategically merging turrets and engaging in first-person shooting. Protect your livestock from swarms of insectoids, mechanical spiders, and massive alien spaceships.
Engage in a futuristic tower defense experience with over 30 levels of intense alien warfare. Build and upgrade defensive towers, utilize power-ups, and strategize to protect your base from relentless waves of enemy spaceships. Compete with others through leaderboards and achievements.
Defend your space base from waves of incoming enemies by strategically placing and customizing unique towers. This offline strategy game offers deep customization with modular elements and elemental bonuses to overcome challenging levels.
Design and manage an automated factory on a colossal sandship roaming a post-apocalyptic alien desert. Craft complex materials, trade them for resources, and uncover ancient technologies while defending against hostile forces. Explore ruins, solve puzzles, and build your ultimate factory.
Defeat waves of aliens to gain resources and power up your neon towers. This offline sci-fi tower defense game features incremental upgrades and automatic combat, even when you're not playing. Master alien invasion strategies to push deeper into the galaxy.