Lumen vs Hypothesis: annotate together or write alone.
The short answer
Hypothesis is an open, standards based annotation layer for the web and PDFs, strong for classrooms and group discussion. Lumen is a personal reading tool: private highlights and notes that flow into your own notes app, plus a library, reader view, reading plans and agent access.
Side by side
| Feature | Lumen | Hypothesis |
|---|---|---|
| Price | Free plan; Pro free for 7 days | Free, open source |
| Group annotation | Not yet | Yes, its strength |
| Send to Obsidian, Notion, markdown | Yes, automatically, once each | Through the API or community plugins |
| Library and reader view | Yes | No |
| In progress | Yes | |
| AI and MCP | Yes | No |
Facts about Hypothesis checked 2026-11-01. Prices and features change; check their site before deciding.
Choose Hypothesis if
- You annotate with a class or a team and want discussion threads on the page.
Choose Lumen if
- You read alone for your own writing and want notes in your own app.
Switching takes five minutes
- Export annotations through the Hypothesis API.
- Save the sources in Lumen; highlight new reading with the extension.
Questions
Answer
Does Lumen use the same anchoring as Hypothesis?
The same idea: a text quote with surrounding context, as in the W3C Web Annotation model, so highlights survive page changes.