Hypothesis

Hypothesis is a mission-driven, open-source platform that enables a conversation layer over the entire web. Built on the W3C Web Annotation standard, it allows users to highlight and comment on any webpage, PDF, or EPUB without modifying the underlying source code. In the 2026 landscape, Hypothesis has solidified its position as the critical infrastructure for 'Human-in-the-Loop' AI training and verifiable digital provenance. Its technical architecture utilizes a decentralized approach, allowing for public, private, and institutional groups to collaborate securely. The platform integrates deeply with Learning Management Systems (LMS) via LTI standards, making it the industry standard for collaborative reading in higher education. By treating annotations as first-class digital citizens, Hypothesis provides a structured data stream (via its REST API) that researchers and developers use to map discourse, verify claims, and build collective intelligence databases. It functions as a browser-neutral extension or a script-injected overlay, ensuring high availability across all modern web environments while maintaining strict adherence to user privacy and data portability standards.