176+ iOS apps & games curated and reviewed
Looking for free galaxy defense fortress apps and games? 19 of our 176+ tracked titles are free to download — no subscription, no trial. The rest are premium picks worth paying for.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 |  | Free | 4.8★ (9K) | Yes | Yes | Aug 2026 |
| 2 |  | Free | 4.7★ (652K) | Yes | Yes | Aug 2026 |
| 3 |  | Free | 4.6★ (868) | Yes | Yes | Aug 2026 |
| 4 |  | Free | 4.8★ (1.8K) | Yes | Yes | Aug 2026 |
| 5 |  | Free | 3.8★ (88) | Yes | No | Jul 2026 |
| 6 |  | Free | 4.7★ (603) | Yes | Yes | Aug 2026 |
| 7 |  | Free | 4.8★ (561) | Yes | Yes | Aug 2026 |
| 8 |  | $1.99 | 4.7★ (369) | No | Yes | Aug 2026 |
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 epic space combat strategy by building and defending your base. Command a diverse army of ground and air units, gather resources, and battle millions of players worldwide to dominate the galaxy. Features stunning 3D graphics and a challenging campaign mode.
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 your homeland from waves of evil robots by strategically deploying and upgrading a variety of powerful weapons. Explore diverse landscapes and adapt your tactics to overcome increasingly challenging robotic invaders in this exhilarating tower defense game.
Engage in thrilling survival battles against endless enemy waves. Strategize with weapons, abilities, and gems to upgrade your character and overcome escalating challenges in a dynamic roguelike environment.
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 strategic real-time combat within a blocky sci-fi universe. Build defenses, command diverse alien armies, and lead heroes through a vast campaign or multiplayer battles.
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 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 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 your kingdom by strategically activating ancient gear-driven machines. Summon troops, construct defenses, and unleash powerful weapons against endless enemy waves. Adapt to diverse environments and enemy tactics to achieve victory.
Defend Earth from an alien invasion by building a strategic space station fortress. Deploy a variety of upgradable weapons and traps to overcome over 150 waves of enemies and challenging bosses.
Defend Earth from a massive alien invasion in this sci-fi multiplayer strategy game. Build your base, raise an army, and command powerful heroes to retake the planet. Form alliances and engage in real-time faction wars against both aliens and hostile humans.
Command powerful fleets in epic space battles, manage resources, and build planetary facilities. Customize your starships and lead your alliance to conquer the galaxy in this sci-fi real-time strategy multiplayer saga.
Build and defend your castle from endless monster waves in this offline strategy game. Forge gear, upgrade your kingdom, and recruit heroes with unique abilities to survive over 10,000 levels. Compete on leaderboards and advance your defenses.
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 intricate mazes to defend against waves of enemies in this 2D area defense game. Choose from various towers and weapons to create strategic defenses. Offers both free-form maze building and guided story modes with fixed paths.
Engage in real-time PvP combat to conquer the galaxy. Build your base, train an army of futuristic robots, and strategize attacks to steal resources and earn medals. Features stunning 3D graphics and various war modes.
Engage in thrilling arcade-style space combat, defending the galaxy from alien invaders. Pilot customizable starships, upgrade weapons, and face challenging missions and bosses. Experience a blend of classic nostalgia and modern action with competitive multiplayer and leaderboards.