Hi Neophytos! Love that you took the effort to take a designer-favorite forum and turn it into a mobile app for easy access! However, because this is for designers and design is something that we value rather highly, a lot of us feel that effort should have been made towards creating a more visually appealing UI and that we cannot justify purchasing a product that should be free until the UI is improved upon. Maybe drop the price to free? Or hire a designer? If you don't want to hire a designer, there are many UI kits available for free that designers put out there (such as the Flat UI Kit from designmodo). Happy to help you guys on the design front!
If you'd like more feedback, you can check out the thread on DN. Some of it is harsh (sorry), but I think if you were to improve the UI, we'd be more receptive towards purchasing and using the app: