A backend you're comfortable with as others has said. App support is the tricky part in my experience. I haven't found a workflow that I love yet. Developing

A backend you're comfortable with as others has said. App support is the tricky part in my experience. I haven't found a workflow that I love yet. Developing for web and creating an app that wraps the website works fine. The problem is that you'll likely get rejected when submitting to the app store & play store. You could go with Flutter for app & web or react-native-web but it's still very early days and there's lots of issues. I find it's not worth the effort. The best compromise I do right now is React for web. And then a separate react-native app. Realistically, you could have similar architecture for handling data. However, the rest will still be different. Eg: Routing & Display components.