I want to add feature of video calling in my iOS application.I have created one demo using quickblox. I want confirm that can I upload the application on app store without any charges. Are there any limitation on use of quickblox ? Is the API completely free for iOS?
According to QuickBlox plans http://quickblox.com/plans/ there are no any limits for number of VideoChat minutes. It's only 100 Concurent Video Calls per account. QuickBlox won't require payment for Basic plan.
If you need better performance - you can switch to other plans.
So, answer is Yes - you can upload it without any doubts.