Readwise Reader

Readwise Reader is a comprehensive 'read-it-later' application designed for power readers. It allows users to save and organize diverse web content, including articles, PDFs, videos, and newsletters, into a single, distraction-free reading environment. The platform emphasizes powerful highlighting and annotation features, and integrates with the original Readwise app for highlight review and export to other note-taking tools.

Readwise Reader is a strong match for the URList concept. It functions as a 'read-it-later' app, allowing users to save various types of web content (articles, PDFs, YouTube videos, Twitter threads, newsletters, EPUBs) and organize them. While it doesn't explicitly mention 'sections' within lists, the ability to save and organize different content types implies a similar organizational structure. It supports highlighting and annotation, which aligns with 'contextual side notes' although the implementation might differ (more focused on highlighting than Tufte-style side notes). The platform emphasizes a distraction-free reading experience and offers public sharing features through its integration with Readwise. It also supports various media types and has a mobile-responsive design.