We have very well knowledge in all the technologies, frameworks, languages, database, payment modules like ObjectiveC, Xcode, HTML5, CSS3, UIKit Google map etc. which can be used in iPhone App development.Generally i use Xcode 5.1.1 with objective C with Cocoa touch to develop apps for iOS6, iOS7 and new release iOS and will also will move to Xcode 6 once iOS 8 will lift the Beta as i have experience in developing as using all these technologies