Cydia is known as AppStore alternative for jailbreak tweaks. The reason people opt for jailbreak is to be able to customize their iOS 12 powered iPhone X, 8 Plus, 6S, SE, iPad Air or Mini to their will.
iOS users have been anxiously waiting for the feature that would allow them to individually lock apps on iPhone using TouchID or FaceID. This is something Apple should really work upon to include in their latest iOS version. Anyhow, until we get it as built-in feature, allow us to introduce a new Cydia tweak named ShieldXI.