PDF database takes the metadata info and file details from your PDF files and stores it all in a PDF database which you see in a clear table and which you can query with simple, standard database queries.

You can search for PDFs by any of the metadata fields extracted, using simple, standard SQL database queries.

You can also launch PDFs from the app, rename them.

Please also check out PDF Compare. The best app for comparing two PDFS:
https://www.microsoft.com/en-us/store/p/pdfcompare/9n9dmzjbz2nl#