Hypothesis
What is Hypothesis?
Hypothesis is web-based annotation software that can be used to annotate both html and pdf documents. Hypothesis enables highlighting and sentence-level note taking or critique on top of news, blogs, scientific articles, books, terms of service, ballot initiatives, legislation and more. The tool is available as a browser extension or bookmarklet
To annotate with Hypothesis, you will need to create a free account then install either a Chrome extension or bookmarklet for other browser types.