Hypothesis
Hypothesis: A free, open-source annotation platform with strong education and collaboration features. Ranked #1 of 31 in Web Annotation Tools by our editors (9.3/10); pricing: Free plan; best for open-source web and document annotation.
At a glance
- Editor score9.3 / 10
- PricingFree plan
- Best forOpen-source web and document annotation
- Free planYes
- Collaborative reviewYes
- Founded2011
- Facts checked20 Sep 2026
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
Our verdict on Hypothesis
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.
Your product? Our editors can test Hypothesis in depth and publish a review, labelled as paid · from $149/mo →
Hypothesis pricing
All 4 Hypothesis plans and prices →
Hypothesis fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Not verified |
| Annotation modes | Both |
| Collaborative review | Yes |
| Guest access | Yes |
| Document support | Both |
| Browser capture | Yes |
| Team seats | 1000 seats |
| Export options | JSON, plain text, CSV, and HTML; import from JSON |
| Deployment | Cloud, Browser extension |
| Platforms | Web, Chrome extension |
| Support | Email, Tickets, Docs |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 7 integrations: Canvas, Blackboard, Moodle, D2L Brightspace, Sakai, JSTOR … See all → |
| Pricing | Free plan (source) |
| Website | web.hypothes.is |
| Facts checked | 20 Sep 2026 |
Hypothesis integrations
Hypothesis lists 7 integrations on its own site.
- Canvas
- Blackboard
- Moodle
- D2L Brightspace
- Sakai
- JSTOR
- VitalSource
See all Hypothesis integrations →
Alternatives to Hypothesis
- PinPointA free web annotation workspace combining collaborative review, PDF proofing, and AI QA.9.1
- PerusallA course-focused annotation platform combining discussion, assessment, analytics, and LMS sync.9.0
- Annot8A full-featured website feedback hub with DOM comments, capture tools, triage, and integrations.8.9
See all Hypothesis alternatives →
Hypothesis vs the competition
- Hypothesis vs PinPoint
- Hypothesis vs Perusall
- Hypothesis vs Annot8
- Hypothesis vs WebPinch
- Hypothesis vs Webvizio
- Hypothesis vs BugHerd
Compare Hypothesis with any tool side by side →
Also Ranked In
Hypothesis is ranked in 2 of our directories.
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Featured on iTechGuides
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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