Ruminate

Ruminate is an AI reading companion that sits beside a document and helps a reader understand it. It is built for people reading dense material such as research papers and books, and it replaces the habit of copying passages between a chat assistant and the document. A reader imports a PDF or an EPUB, selects text, asks a question in context, and revisits the resulting insights later. The reader supports definitions and question answering inline, and the language model appears beside the text only when the reader wants it. Public domain classics such as Moby Dick, Pride and Prejudice and War and Peace come preloaded. The site also lists the day's popular arXiv papers across fields such as machine learning, robotics, neuroscience and economics, each with an option to open the paper directly in Ruminate. The product description also states that the AI analyzes and explains content block by block, adapting to a reader's learning objectives. The site does not publish pricing and offers a Get Started button for new users.