As the title says, you want to create an application that shows my web page without the user seeing that it is a web page and allows casting.
I leave an example of an application a little similar to what I want
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This application allows casting of any web page I want you to just work with my page and use my chromecast receiver app
53 freelancers are bidding on average $514 for this job
Hi, nice to meet you. I have developed many casting mobile app. So, I am sure I can complete your job perfectly. I hope to discuss your job perfectly. Thank you.