How much does it cost?

Can you help me to get an idea of cost to build an ios/android app that collects news from the web, filters it based on user preferences, then runs algorithms, the app is based on artificial intelligence to check the news whether it is fake or not and other features, so I would like to understand how much it would cost to build it, run it, how much more or less it would cost to run the bees and marketing, can you give me some rough costs ?

Thank you very much