Hypothes.is Alternatives

Diigo is a powerful research tool and a knowledge-sharing community

Workspace to highlight, organize & collaborate on your research articles.

Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.

Put simply, Liner is a virtual highlighter. It works on PDFs and webpages in the same way a regular highlighter works on books and magazine clippings. Read more about Liner.

scrible lets you highlight and annotate web pages and easily save, share and collaborate on your...

When you find something you want to view later, put it in Pocket.

All your articles, photos, video & content from web & apps in one place.

freemium

The simple way to save & annotate web pages and PDFs, compare different concepts across the literature, organize your bibliography and generate citations.

freemium $1.25 / Monthly (2GB Storage, 10 Projects)

Social web highlighter

free

Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.

A powerful document manager for Mac, Windows, and Linux for managing web content, books, and notes and supports tagging, annotation, highlighting and keeps track of your reading progress.

Marker.to is a simple annotation tool.

Distinct from Genius's original rap and music lyric annotations, Genius.