Pearltrees is described as 'social curation tool. It lets you organize, discover and share the stuff you like on the web' and is a popular app in the Web Browsers category. There are more than 50 alternatives to Pearltrees for a variety of platforms, including the Web, iPhone, Google Chrome, iPad and Windows. The best alternative is Raindrop.io, which is free. Other great apps like Pearltrees are Diigo (Freemium), Pinterest (Free), Tagpacker (Free) and Pinboard (Paid).