Hello I am Sumit,
I am using coupon duniya app in iOS. this is amazing and easy to use but sometimes it gives some problems like in open, operate etc.
couponduniya provide such a nice coupons which working in most of the cases.
couponsduniya site having much advertisement sometime it become irritating to use. and please again I will say that please fixes the bug in your iOS app, so that we can use it hassel free