Hypothesis review
A free, open-source annotation platform with strong education and collaboration features.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Hypothesis is a web-based social annotation platform for highlighting, commenting on, and discussing digital content. It suits individuals, educators, and higher-education organizations that need collaborative review across webpages, PDFs, EPUBs, videos, and eTexts. Users can organize discussion through threaded replies and groups with private, restricted, open, or public access. The free, open-source web app supports personal annotation and collaboration, with browser access and a Chrome extension.
Its strongest fit is education and structured collaboration. Bronze, Silver, and Gold plans add LMS integration, while supported platforms include Canvas, Blackboard, Moodle, D2L Brightspace, and Sakai. Paid education tiers can also add advanced analytics and auto-grading; Silver includes Hypothesis Academy, and Gold adds unlimited training, a dedicated CSM, and premium support. The platform also connects with JSTOR and VitalSource, and its API supports management of annotations, users, and groups.
The free plan includes core annotation, private groups, and self-service support. Institutional plans are presented on a per-student, yearly basis and direct buyers to sales. Annotation export supports JSON, plain text, CSV, and HTML, while import is available from JSON. Hypothesis is a strong choice for open-source annotation, collaborative reading, and LMS-connected learning workflows. Organizations focused on broader content workflows beyond annotation, or that need advanced education administration without a paid tier, should consider whether its text-centered approach and plan structure match their requirements.
Hypothesis pros and cons
- Where it wins
- Annotates webpages, PDFs, EPUBs, videos, and eTexts
- Supports private, restricted, open, and public groups
- Offers LMS integrations, APIs, import, and export options
- Where it doesn't
- Core emphasis remains text annotation
- LMS integration is offered on paid education plans
- Advanced analytics and auto-grading require paid plans
Hypothesis fact sheet, pricing and score →
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