Hypothes.is
Open-source web and PDF annotation
⭐ 4.4/5 (3000 reviews)
About Hypothes.is
Hypothes.is is a free, open-source annotation tool for the web and PDFs. Add highlights and notes to any webpage or PDF, share annotations, and build collaborative knowledge.
Key Features
- Web annotation
- PDF annotation
- Social highlights
- Groups
- Browser extension
- API
- LMS integration
✅ Pros
- Free and open source
- Works on any webpage
- Collaborative
- Academic community
❌ Cons
- Basic interface
- Limited features
- Niche use case
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