Ask HN: Getting quick UIX/Design feedback

I'm working on a mobile app, but I know my limitations and want to get my app "reviewed" for UIX/Design by someone who has knowledge on that topic. As I'm a hobby developer, I'm not into hiring a freelancer to do this.

What is a good site or place to get UIX/Design feedback on my app without paying an hourly rate for a freelancer?

Thanks HN!