I want a simple CRUD mobile app that talks to a website. Like a website where you GET and POST to read and write data. Something that copies the submission form

I want a simple CRUD mobile app that talks to a website. Like a website where you GET and POST to read and write data. Something that copies the submission forms of a website and gives me the website as a mobile app. Something that identifies all endpoints in a website and gives me access to these endpoints as a mobile app.