AI product readCollaborative web and PDF annotation tool that allows users to highlight, annotate, and tag web pages, PDF documents, and EPUBs
Enables collaborative reading, research organization, and discussion by allowing users to add annotations, highlights, tags, and comments directly on web content and documents
User installs extension, browses web pages or opens PDFs, selects text to highlight or annotate, writes comments/tags, and shares annotations with collaborators through Hypothesis groups. The extension injects a sidebar into web pages and provides a built-in PDF viewer. Annotations are stored on the Hypothesis service (hypothes.is) and synced across devices.
Highlight text on web pages, PDFs, and EPUBsCreate annotations with comments on any web contentTag and organize annotationsCollaborative annotation in shared groupsSupport for PDF viewing with built-in PDF.js viewerSidebar interface for browsing and managing annotations
- Target users
- Researchers / Students / Academics / Journalists / Knowledge workers / Anyone needing collaborative reading and annotation
- Source files are heavily minified (annotator.bundle.js, sidebar.bundle.js), making deeper code analysis difficult
- Could not inspect the actual Hypothesis API to determine if free tier has usage limits or feature restrictions
- The extension's profile.html and notebook.html are minimal HTML shells loading from the same bundle, limiting visibility into specific UI flows
MonetizationNo paid features detected
No evidence of paid feature gating, billing APIs, subscription logic, upgrade prompts, or premium feature checks in the extension source code. The 'premium' keyword match found in ui-playground.bundle.js line 276 is in unrelated sample text about California rolls (sushi description). No Stripe, payment, or billing integrations detected. The Hypothesis service (hypothes.is) offers organizational/enterprise plans externally, but the extension itself does not gate any features behind payment.
- Confidence
- 80
- Payment platform
- --
- Source
- AI / Medium
- Login required
- Yes
- Reason
- The extension uses OAuth to authenticate with the Hypothesis service (hypothes.is). The sidebar code has an `isLoggedIn` selector checking `profile.userid !== null` (sidebar.bundle.js line 109), and the UI shows a 'Log in' button for unauthorized users when accessing content (sidebar.bundle.js line 134). Creating annotations requires an authenticated user account on hypothes.is. The extension itself does not implement its own account system — it delegates authentication to the Hypothesis destination service via OAuth (oauthClientId configured in app.html line 10 and extension.bundle.js line 180).
One of the most underrated tools on the internet. I've been using it consistently for a little over 2 years now for everything from keeping track of random ideas to SEO & Web Design. 🖤🖤🖤
I found a fun bug~ I am a developer and when I open localhost, I can see the notes from all users around the world~
Totally free and easy to use!
免费是最大的优点, 缺点是不好统一管理
excelent
竟然是完全免费的,太棒了!
A robust way to annotate web sites, and the relocatable PDF annotator is pretty cool, too. I can imagine some usability improvements that would make for a more natural user experience, and some features that would be helpful, but all in all a great product.
This is wonderful. Getting help from colleagues and helping around is way easier now. :).
I've been using Hypothesis since January 2018. This is the number one extension that I install on a new computer. The search function is amazing, it helps me to recall sites and annotations on any topic that I care to re-search. As my laptop died recently and had to install this extension, I took this opportunity to write this review. My mind boggles, how come not everybody is using this. Kudos to the whole Team
Lovely. From copying notes on Word files to saving web pages, I have struggled quite a lot keeping track of interesting content. With Hypothes.is, this is no longer a problem. I can have all my annotations in one place and choose to go back to them whenever I want. Kudos to the makers!