Papers is a cross-platform suite of reference management and discovery tools designed to improve the way researchers find, access, organize, read, annotate, share, and cite research literature. It offers built-in search engines, personalized recommendations, related article feeds, institutional proxy support, web importing via browser, 1-click PDF downloads, advanced search filters, easy importing tools, auto article metadata matching, full text library search, advanced sorting and filtering, manual and smart collections, keyword tagging, labels, and article ratings. It also provides enhanced PDF viewing, hyperlinked inline references, high-res figure browsers, auto-fetched supplements, advanced article metrics, inline and sticky notes, highlighting and drawing tools, and a text-to-speech tool. Users can share and collaborate with up to 25 Papers users per collection, share references, PDFs, notes, tags, and PDF annotations, and participate in article discussion groups. Papers also allows users to insert references from personal/shared libraries or use the built-in search engine, supports 8000+ citation styles, and offers quick-copy of citations in bibtex, ris, and export reference list for use in third-party citation tools like EndNote and Overleaf. Finally, Papers provides unlimited cloud storage for personal libraries and syncs the entire library, including notes, lists, annotations, and highlights, across all devices, including desktop (Mac/PC), mobile (iOS/Android), and web.