Only real option, but could use some improvements – PaperShip - Mendeley & Zotero Review

Being able to sync my Zotero library on to my iPad and annotating the PDFs is something I’ve used extensively over the years. No other app has been able to accomplish this, to my knowledge. That said, PaperShip isn’t perfect. Mainly: * While you can search for literature in the app, I have never been able to add it to my library successfully. It usually just silently fails. I still have to add items to my Zotero library on my regular computer, then sync them to the iPad. Please, please fix this. It’s a hassle and it would be amazing to do everything directly from the iPad. * Minor feature suggestion: a built-in “dark”/inverted mode for PDFs would be nice. You can use the iPad OS smart invert to do this, but having it in the app would be nice.
Review by Highwayhigh on PaperShip - Mendeley & Zotero.