I had personally problem with the Afforai founder who wasn't trusted to me. So I had to look up for something similar and honestly speaking Paperguide guys are very nice. When I had a problem understanding some features they always came back to me with a simple explanation of how it worked. The app itself works as expected. It suits my needs as I'm studying my third UNI so I do a lot of research and this app helps me a lot. I just have to explore if I can work in different language as I speak fluently in 3 languages and sometimes I do research from different websites. Will see but this one is 100% a keeper.