维基百科：https://en.wikipedia.org/wiki/Hypothes.is
官方的说法是“Our mission is to bring a new layer to the web. Use Hypothesis to discuss, collaborate, organize your research, or take personal notes”（我们的使命是带来网页的新层次。可以使用hypothesis来讨论、整合、组织你的研究，或者记录个人笔记）
- 需要安装谷歌Chrome网页浏览器，该程序是Chrome的一个拓展应用；
- 可以标注、评论阅读的网页、PDF文件，官方的说法就是网页、PDF标注（web & PDF annotation）；
- 可以设为公开（public）的评论，也可以设为私人（private）的评论；
- 可以建一个群组（group），然后邀请别人加入，共同批注、讨论一些内容，官方的说法是“To enable a conversation over the world’s knowledge.”（使世界知识能够对话）；
- 支持API，可以导出数据到其它应用；
- 支持中文；
- 界面简洁、清晰、流畅。
更大的领域是web annotation，维基百科上有此类软件的比较列表：
https://en.wikipedia.org/wiki/Web_annotation
Hypothesis是一个网址收藏、网页内容剪藏、批注、评论的工具，只需在google chrome浏览器安装该插件即可。
这是一个开源、免费的项目，得到了很多基金会的支持。
这是一个非常好的个人知识管理工具，大大提高了网址、网页内容管理的效率。
以下内容来自Hypothesis官网
This is a new effort to implement an old idea: A conversation layer over the entire web that works everywhere, without needing implementation by any underlying site.
Our team creates open source software, pushes for standards, and fosters community.
Using annotation, we enable sentence-level note taking or critique on top of classroom reading, news, blogs, scientific articles, books, terms of service, ballot initiatives, legislation and more. Everything we build is guided by our principles. In particular that it be free, open, neutral, and lasting to name a few.
Our efforts are based on the annotation standards for digital documents developed by the W3C Web Annotation Working Group. We are partnering broadly with developers, publishers, academic institutions, researchers, and individuals to develop a platform for the next generation of read-write web applications. You can follow our development progress on our roadmap. Many have contributed tools, plug-ins and integrations.
If you’d like to participate, add our extension to your browser and create an account, or integrate annotation into your learning management system (LMS).
A short animated clip tells our story in pictures, and a presentation at the 2013 Personal Democracy Forum provides a little more context.
