Readcube accompanies you on all journal websites. It is present in the most popular text editors (Word and Google Docs). You can search for articles directly in its search engine, you can choose from many styles, you can use your library code to access articles, you export to many formats, you save your pdfs online, you highlight and annotate. It is multiplatform. In fact, it has everything I need to keep my citations organized and to generate the cited literature for my works.

ReadCube's Papers is just brilliant. I am a historian and I have been managing my library on it for a few years now. And it's been a game changer. I can access the material and my annotations from anywhere. The search feature scans through the library cross-sectionally! The new AI feature is also pretty decent. So is the latest UI. I recommend it to colleages and students pretty often.

It is very easy to import papers and organize them. I especially love the feature where it shows the figures, references and data related to the paper in the side bar.