Readwise

Readwise is a digital tool that helps users retain and organize insights from their reading by importing highlights from various sources like Kindle and Instapaper. It leverages spaced repetition and active recall through daily reviews to enhance memory and offers features for organizing, searching, and exporting highlights to other note-taking applications.

Readwise focuses on helping users remember what they read by importing highlights from various sources (Kindle, Instapaper, etc.) and resurfacing them through a daily email and app. While it allows users to organize highlights with tags and notes, it doesn't primarily focus on curating and sharing collections of URLs in the same way URList does. It's more about personal knowledge retention from existing reading materials rather than new link curation and public sharing of those curated lists. The 'contextual-side-notes' feature is matched because Readwise allows users to add their own annotations to highlights. 'Sign-in-authentication' is matched as it's a core part of their service for managing user accounts and highlights.