As an AppSumo veteran, I've seen it all. In five years as a Sumoling, I have purchased nearly 1,000 deals. I rarely give this much praise to a product, but Afforai deserves it. In my opinion, this will be one of the top 10, maybe even top 5, best LTD purchases I've ever made. Zotero and similar products are completely outclassed by the product. In the event that this tool returns to AppSumo, it should be your first purchase if you do any kind of research or are in academia. Even if this deal returns for a brief period, I can't emphasize enough how much you will rely upon it as a researcher, student, or other member of academia if it does.