250+ iOS apps & games curated and reviewed
With an average user rating of 4.3★, the alien defense category is one of the App Store's strongest. Browse all 250+ apps and games we track, sorted so the most loved ones surface first.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 |  | Free | 4.7★ (14K) | Yes | Yes | Sep 2026 |
| 2 |  | Free | 4.6★ (944) | No | Yes | Aug 2026 |
| 3 |  | Free | 4.7★ (34K) | Yes | Yes | Sep 2026 |
| 4 |  | Free | 4.7★ (9K) | Yes | Yes | Sep 2026 |
| 5 |  | Free | 2.9★ (13) | Yes | Yes | May 2026 |
| 6 |  | Free | 4.6★ (10K) | No | Yes | Sep 2026 |
| 7 |  | Free | 4.7★ (50K) | Yes | Yes | Sep 2026 |
| 8 |  | Free | 4.2★ (142) | No | Yes | Sep 2026 |
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.
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 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.
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.
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 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.
Engage in a thrilling 3D first-person shooter experience fighting off hordes of zombies in an offline apocalypse. Equip deadly weapons, upgrade your arsenal, and complete endless missions to survive the undead.
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 against waves of alien invaders in this engaging defense game. Strategically place your defenses to repel the extraterrestrial threat and protect your territory. Experience a straightforward yet challenging gameplay loop designed to test your tactical skills.
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.
Engage in intense offline gun battles with realistic graphics and a vast arsenal. Complete challenging missions, upgrade your gear, and strategically plan attacks to become the ultimate warrior in this thrilling combat experience.
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 your city from an alien invasion by strategically deploying advanced weaponry and powerful heroes. Command the last line of defense to thwart enemy attacks and prevent occupation.
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.
Experience a satisfying golf puzzle game with realistic physics. Master your swing to overcome obstacles and aim for the perfect shot, earning stars to unlock surprise rewards and collect unique golf balls.
Defend your base from an alien invasion by strategically placing and upgrading towers. Utilize power-ups and adapt your tactics to overcome waves of unique alien creatures across hundreds of challenging levels.
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.
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 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.