27 Jan 12pm PST: This webinar introduces and demonstrates the Hypothesis annotation tool and shows how collaborative annotation can transform your classroom, making reading active, visible, and social. Join us >

Annotate the web,
with anyone,

Get Started

Engage your
students with
social annotation.

Learn More

See how it works.

Select text to annotate.
Add tags and post publicly or save privately.

Reply to or share any annotation.
Link to notes or whole pages.

Annotate together in groups.
Collaborate privately with others.

Search your notes.
Explore all public annotations and profiles.

An open community project.

We're a mission-driven organization.

Dedicated to enabling layers of conversation over the world's knowledge.

Building an open platform

That works everywhere, based on open-source technology and interoperable standards.

As a part of a global community.

Working with others across the world to advance human understanding for the public good.
Learn More
about Hypothesis.