Fifty Five and Five

Save URLs, snippets, ideas, knowledge and tasks direct to your Ultrathink account

Ultrathink is your personal knowledge base. Save anything from the web with a single click or keyboard shortcut - URLs, text snippets, screenshots, AI conversations from ChatGPT and Claude, emails, and more. Every entry is automatically classified, tagged with topics and people, and enhanced with AI-generated summaries. Access your knowledge base from anywhere through the Ultrathink web app, where you can search, filter, organize into projects and tasks, and visualize connections between your saved content. Perfect for researchers, developers, and anyone who needs to capture and organize information from across the web. Supports bulk saving of all open tabs, automatic content detection, and seamless sync across devices.