COMPARISON
DomWhisper vs Hypothesis
Open-source annotation for education and research
What Hypothesis is
Hypothesis is a free, open-source web and PDF annotation tool with a strong presence in education. It organizes activity around public or private groups and offers an API, which is why many LMS and research workflows are built on top of it.
HypothesisFeature comparison
| Feature | DomWhisper | Hypothesis |
|---|---|---|
| Text highlighting | Yes | Yes |
| Click a DOM element to annotate it | Yes | — |
| Groups (public / private) | — | Core feature |
| Private / public visibility | Mine vs World | Group-scoped |
| Community rankings of websites | Yes (public whispers) | — |
| PDF support | — | Yes |
| Open source + API | — | Yes |
| Export to Markdown | Yes | Via API |
Where DomWhisper wins
- Fully open source with an API — you can build on it; DomWhisper is closed.
- Group workflows fit classrooms and teams that annotate documents together.
- Free at every scale.
Where the competitor wins
- The web client is document-centric: highlights float in a sidebar rather than living visually on the page like DomWhisper markers.
- No point annotations, no per-element notes.
- No aggregated "most discussed sites" view — public annotations stay scattered across groups.
The verdict
Hypothesis is the right call for institutions and teams that need open-source, group-based, API-driven annotation. DomWhisper targets individuals: annotations that sit visibly on the page, a real private/public split, and public rankings you can browse without joining anything. If you are not running an LMS integration, DomWhisper is the lighter and more visual option.
See what people are discussing, then add your own whisper.
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