I've been using Afforai for a couple of weeks now and it works very well. I'm using it to organize and query papers (to get a quick overview of the main points) and add anotations. Recently I have also generated bibtex entries directly using document retrieval mode which works great. I saved a custom prompt to generate them in the style I want:

"As an expert in LaTeX and BibTeX and a thoughtful AI assistant, please create a BibTeX entry for the following URL. Think of each field carefully and separately. As the citation key use "lastname of author", "year", and two descriptive words in the title that make clear what the article is about. Please use the @article class and add a note with the access date following the template "accessed Month, day year" where the month is, for example, "May." Ensure "accessed" is lowercase. Based on the url try your best to retrieve the full name of the organization. Think carefully to get the correct name. Add the fields "journal" and "publisher" filled with the full name organization that published the URL. Do not include the abbreviated name in these fields. Take extra care to find the author of the article. Use the name or names of the contributors even if they are note explicitly credited as authors. Only if there is no author should the organization's abbreviation be used as the author. Before using the organization's abbreviation think again if you can find the author. Look again on the page. Ensure you use only the abbreviation. Here is the link:"