[iOS - semi OT] Advice for a management app

Hi guys,

I use a lot of custom tools (mostly SQL based) to manage my business and I’m thinking to write an iOS app, so I can have everything with me in my iPad.

I have never did anything like that before, so I’m asking for your advice about what would be the best approach to not reinventing the wheel. I love JUCE for a lot of stuff (I also have internal use desktop apps made with it), but I hate the UI styling part. For audio plugins is pretty straightforward, but for these kind of applications, could not be the best option. Is there anything that I can use to easily sketch my app UI, have some widgets and so on?

Thank you in advance!
Luca