No reason for this to exist
Fist of I need to say that I did pay and use this apps full version while researching for my thesis so I am not a random fake reviewer. There are countless free apps that work flawlessly as browser extensions to save any kind of page/ article and not just pdfs(starts with zo and ends in tero), but this needs special attention to save your literature. Those other apps also provide you with free tools for citation too. If not of extra help for article and thesis, then why not just get an audiobook service??? Or just get gpt4 that can provide you instantly with any info you need from the paper, better yet a combination of a free pdf reader, gpt and something like zotero. I really don’t understand this application and it is not cheap either. Also something else I didn’t fully get, I am pretty sure you can only listen to papers on a mobile device…. Why not computer where you actually do your research? I am sorry but being a product and service design engineer myself, I can’t see a single reason that this is worth spending money for.