Upcarta: Find The Best of Web

Upcarta is a mobile application that serves as a centralized hub for discovering, organizing, and sharing meaningful web content. Users can save links, create curated collections of various media types, and share their recommendations with a community or privately. It aims to provide a focused environment for content consumption and knowledge sharing.

Upcarta is a strong match for the URList concept. It allows users to save content links from anywhere, organize them into collections (lists), and share their favorite content on their profile. The app focuses on discovering and engaging with curated content, aligning well with the idea's core value proposition. While it doesn't explicitly mention 'inline previews' or 'Tufte-style side notes,' the ability to save and organize content, along with public sharing and profile pages, covers the essential functionalities.