What are some alternatives?
lumio - Break up with bookmarks! Meet lumio.
Candy - Bookmarks for the 21st century.
RevNote - The simple way to save & annotate web pages and PDFs, compare different concepts across the literature, organize your bibliography and generate citations.
Highly for iOS - Medium-style highlighting in every app and website. 🖌
Biblioscape - Biblioscape is a bibliography software to generate citations and a bibliography in APA, MLA, etc.
Paperpile - Clean and simple and reference management for the web. Sync your PDFs to Google Drive and cite your papers in Google Docs.