What are some alternatives?
When comparing Cardhop and Hypothes.is, you can also consider the following products
Google Contacts Map - See all your Google Contacts on a Google Map
RevNote - The simple way to save & annotate web pages and PDFs, compare different concepts across the literature, organize your bibliography and generate citations.
Leadfeeder - Leadfeeder converts your website visitors into sales. Connect your website's Google Analytics to Leadfeeder and unlock the power of seeing who`s visiting your site!
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
The Contact Guru - Managing your contact list so you don't have to
scrible - scrible lets you highlight and annotate web pages and easily save, share and collaborate on your...