You need a Jailbroken device

Jailbreak your iPhone, iPad or iPod touch more info here.

You can add our repo on Cydia

  1. Open Cydia
  2. Tap on Sources
  3. Tap on Edit / Tap on Add
  4. Write: http://repo.hackyouriphone.org
  5. Tap on Add sources / Tap on Add anyway
  6. Tap on Done.
  7. ▶︎ Play video

Now you can install Gravity from Cydia

  1. Tap on Search tab
  2. Type Gravity
  3. Choose the result with our icon on left
  4. Well now tap on Install.

Gravity

Find it for free on Cydia.