Pinterest is a web and mobile application startup that operates a software system designed to discover information on the World Wide Web. Developed by Pinterest
License: Free
StumbleUpon was designed for random content discovery across the web, focusing on articles and websites, while Pinterest is a visual discovery and bookmarking tool centered around image-based content and boards for organization. Pinterest's stronger visual emphasis and community features set it apart, making it more suitable for users looking to curate and share visual ideas.