247+ iOS apps & games curated and reviewed
Looking for free galaxy defense fortress apps and games? 18 of our 247+ 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 | 4.7★ (9K) | Yes | Yes | Aug 2026 |
| 2 |  | Free | 4.7★ (652K) | Yes | Yes | Aug 2026 |
| 3 |  | $3.99 | — | No | Yes | May 2026 |
| 4 |  | Free | 4.8★ (568) | Yes | Yes | Aug 2026 |
| 5 |  | Free | 3.8★ (93) | Yes | No | Aug 2026 |
| 6 |  | Free | — | No | Yes | Jun 2026 |
| 7 |  | Free | — | Yes | Yes | May 2026 |
| 8 |  | Free | — | No | No | May 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.
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.
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 a sci-fi tower defense roguelike where strategic turret placement and merging are key to surviving endless swarms. Optimize your limited backpack grid for unique runs and permanent upgrades.
Defend Earth from alien invasion in this sci-fi tower defense game. Command powerful mechs, upgrade turrets, and utilize hero skills and tactics to repel the Machina Legion and reclaim your homeland.
Command an experimental space fort in the final battle for humanity. Upgrade weapons, enhance defenses, and fight off an unknown alien race in this action-packed galactic war.
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.
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 your fortress from waves of monsters in this free castle defense game. Customize your hero with different skins and voices. Enjoy sweet cartoon graphics and easy controls for hours of fun.
Lead an elite force of Star Marines to defend your base against relentless alien waves in this idle tower defense game. Strategically position your units, upgrade your defenses, and gather resources even while offline to survive the galactic war.
Engage in classic random tower defense with a twist. Summon, swap, and merge mythical allies from three unique races to annihilate relentless waves of enemies. Prove your strategic skills to save the galaxy.
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.