Hypothesis
Open source tool for annotating web pages and PDFs, privately or in shared groups, often used in reading seminars.
- Free plan or free tier
- Open source
Upload a PDF and ask questions about it in chat; answers point to the pages they came from.
Not enough info yet on open source, works in Word or Google Docs, developer API, mobile app. Check the tool's own site.
Listing written by ResearchBest, checked 2026-11-03. Report a correction or request removal. Back to reading and annotating pdfs.