Good day

Please can someone tell me how and where I can create an app for my online radio, with low monthly price?
Thank you

Bob once built them. He's here on the forum.
I do not know if it is / was expensive

Or maybe https://www.nobexpartners.com/

forget Nobex, years ago they made free apps for Radionomy, now they want a lot of money for their apps, and you are queite limited as streaming hours; furthermore, with Radionomy, metadata are (were) all wrong, customer support doesn't support, etc.: months ago I wrote them asking a question about upgrading, they sent me an email saying that they don't answer to people withiut an upgraded account; in my opinion, no way;
be careful with all app websites promising free apps: they let you build your app, and normally they work, then they say that yes, building the app was free, but using it is expensive, even 100$ / month, what a waste of time;