...hire a young web designer with style.
I don't mean this to sound condescending or snide! Yes, I'm talking about surfaces – 'look' is superficial. But my gut reaction to your esthetics is negative – and I don't think that's good for your fine product. Your web graphics remind me of early 20th office software. It turns off young people. Have a look at some youthful iOS apps, or Squarespace sites.
Piss on ‘youthful’ iOS apps and stand your ground. App is great as is. Send young know-nothings to where they belong.