Outer Space Defense is an addictive test of skill pitting your mastery of spacecraft orbital control and prowess with a laser against multiple attacking enemy satellites. See how long you last against a relentless enemy that launches satellites designed to take you out at a faster and faster pace!

Plays great natively on both iPhone and iPad!

You are one of a group of elite satellite operators tasked with controlling one of your country's few remaining surveillance satellites observing the enemy. In order to maintain surveillance, the satellite must be kept as close as possible to its optimal orbit. Watch out though, the enemy constantly sends killer satellites intended to destroy your surveillance satellite. You must avoid these or destroy them with your onboard laser. The longer you last, the faster they come!

As you thrust to maneuver, you use up fuel and as you fire your laser, you run down its battery. Luckily, orbiting fuel depots can replenish your satellite if you get close enough to them. Manage your resources to maximize your points.

Real orbital mechanics and control algorithms govern the motion and abilities of both your satellite and the enemy satellites. Make sure you don't stray too far from your optimal orbit. The closer you stay, the faster your points accumulate and if you get out of control, it's game over!


Three different thrust control modes: tilt-to-thrust, thumb sliders, or directional touch.
Two different laser fire control modes: joystick plus button, or joystick alone.

Try it!

What’s New

Version 1.1.3

Space Defense has been made compatible with iOS 11.


Princeton Satellite Systems
60.4 MB
Requires iOS 10.1 or later. Compatible with iPhone 5s, iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, iPhone SE, iPhone 7, iPhone 7 Plus, iPhone 8, iPhone 8 Plus, iPhone X, iPhone XS, iPhone XS Max, iPhone XR, iPad Air, iPad Air Wi-Fi + Cellular, iPad mini 2, iPad mini 2 Wi-Fi + Cellular, iPad Air 2, iPad Air 2 Wi-Fi + Cellular, iPad mini 3, iPad mini 3 Wi-Fi + Cellular, iPad mini 4, iPad mini 4 Wi-Fi + Cellular, 12.9-inch iPad Pro, 12.9-inch iPad Pro Wi-Fi + Cellular, 9.7-inch iPad Pro, 9.7-inch iPad Pro Wi-Fi + Cellular, iPad (5th generation), iPad Wi-Fi + Cellular (5th generation), 12.9-inch iPad Pro (2nd generation), 12.9-inch iPad Pro Wi‑Fi + Cellular (2nd generation), 10.5-inch iPad Pro, 10.5-inch iPad Pro Wi‑Fi + Cellular, iPad (6th generation), iPad Wi-Fi + Cellular (6th generation), iPad Pro (11-inch), iPad Pro (11-inch), iPad Pro (12.9-inch) (3rd generation), iPad Pro (12.9-inch) (3rd generation), and iPod touch.
Age Rating
Rated 4+
© 2016 Princeton Satellite Systems


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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