?? What do you use as a backend service for app apps?
is Ruby on Rails or PHP?
Php+mysql as the backstage of Android app: http://www.tutorialspoint.com/android/android_php_mysql.htm
Php+mysql as the Web service backend for the iOS app:
Http://www.raywenderlich.com/2941/how-to-write-a-simple-phpmysql-web-service-for-an-ios-app
Http://php.about.com/od/learnmysql/fl/Using-MySQL-with-iOS.htm
Ruby on Rails as an app backstage:
https://matteomelani.wordpress.com/2011/10/17/authentication-for-mobile-devices/
http://collectiveidea.com/blog/archives/2013/06/13/building-awesome-rails-apis-part-1/
Http://railscasts.com/episodes/350-rest-api-versioning
You can also use the Open source Baas project as a background:
Baasbox:
http://www.baasbox.com/features/
Https://github.com/baasbox/baasbox
Dreamfactory:
Https://www.dreamfactory.com/features
Https://github.com/dreamfactorysoftware/dreamfactory
There are some companies or projects that specialize in Baas (backend as a Service) abroad, and can refer to:
http://www.raywenderlich.com/20482/ How-to-choose-the-best-backend-provider-for-your-ios-app-parse-vs-stackmob-vs-appcelerator-cloud-and-more
http://nordicapis.com/why-you-should-build-apps-with-an-api-backend-baas/
What do you use as a backend service for app apps?