iDevice Users
Cydia is a free application software for Apple iPhone, iPad and iPod devices. This can be installed on most of the iOS versions including iOS 3, 4, 5, 6, 7, 8, 9 and 10. Cydia installing on latest iOS 11 is also possible. You can customize & modify your iDevice with Cydia as never before. There are tons of apps & tweaks, themes, extensions available in Cydia store to download & install for your device.
Cydia app is not available in the Apple App Store so, you have to follow special procedure call Jailbreaking to install this app for your device..