165+ 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 165+ apps and games we track, sorted so the most loved ones surface first.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 |  | Free | 4.8★ (127K) | Yes | Yes | Jul 2026 |
| 2 |  | Free | 2.9★ (13) | Yes | Yes | May 2026 |
| 3 |  | Free | 4.7★ (14K) | Yes | Yes | Jul 2026 |
| 4 |  | Free | 4.6★ (9.9K) | No | Yes | Jul 2026 |
| 5 |  | Free | 4.6★ (945) | No | Yes | Jul 2026 |
| 6 |  | Free | 4.8★ (8.9K) | Yes | Yes | Jul 2026 |
| 7 |  | Free | 4.7★ (50K) | Yes | Yes | Jul 2026 |
| 8 |  | Free | 4.6★ (11K) | Yes | Yes | Jul 2026 |
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.
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.
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 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 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 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.
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 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 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 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.
Navigate a challenging jumping game where precision is key. Score points by jumping above the line, but be mindful of increasingly difficult landings. Avoid crashing to maintain a smooth gameplay experience.
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 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.
Swing through challenging levels as a spider stickman. Tap to hook and jump, avoiding obstacles with acrobatic flair. Master the grappling hook to swing from point to point and complete all the levels.
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.
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 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.
Embark on a terrifying quest for survival aboard a space station. Unprepared and underequipped, you must use your wits and courage to escape an unknown menace. Experience a faithful mobile replication of the classic survival horror game, complete with AAA visuals and an arresting narrative.