From what i read, it sounds like something that will be good for newbies and those who often get confuse on what project to invest on since we usually see those questions all the time here in forum, must be an advance version of blockfolio,
i agree with @livingfree, not everyone wants to install app from unknown source on their device considering the high rate of scammers and hackers looking for prey, a website version would be ideal for those who are willing to test it out.
I have also been asking such questions like when the market dip few months ago, I was then little confused on what coin and currencies bag on which I created a thread for it to see what response I could get from it, though many suggested not to reply on people's opinions and so, saying it's better I do my research and make my investment.
For about the app, their details should be clearly outlined here such as the website, social media accounts.