Paperpile is a productivity app designed for Android users that helps them to collect, manage, read, and annotate research papers. With Paperpile, you can easily access all your research PDFs in one place and keep them organized.

The app provides a vast library of 20,000+ academic journals that you can search for papers directly in the app. You can add new papers to your collection with a single tap, and the PDF will automatically download. Moreover, you can save papers from your browser directly into your Paperpile library. If you have restricted content behind paywalls, you can use your university's off-campus proxy access to access them.

Paperpile helps you to bring structure to your library by creating folders and subfolders. You can also organize your library visually by using colored labels and mark important papers with stars. The app also has a search feature that allows you to find the paper you need fast.

With Paperpile, you can read your papers like on paper with a fast and slick PDF viewer experience. You can highlight important sections in different colors, add notes, and never forget an important idea. Additionally, you can add hand-drawn annotations to your papers.

Overall, Paperpile is a useful tool for anyone looking to organize their research papers and access them with ease.