Develop ChatGPT Mobile Iphone and Android App

I'm looking into the develop of a ChatGPT3 mobile app that is similar to the Kiyo App, but I want to focus on Medical Spa - Small Business Owners to help with Copywriting (Social Media ads), Social Media post, Blogs, information and the ability to ask questions just like on openai version,.... but also include an area where we have selected prewritten questions the app provide but a user could input options before the result.