Hi. Parse should do the job ( https://www.parse.com ). We've successfully used them at Vuzum across many native and hybrid apps on both iOS and Android.

I guess the first question is whether the apps already have a database component, or if you are needing to introduce a server call for the first time.
If you have no other factors involved it sounds like a pretty simple database query is all that's needed, in which case pick your favorite stack. I use Apache/PHP/MySQL, and I'm sure plenty of people use Windows/MS-SQL. If you can provide more information, it would help refine the answer.