Sentelo is a free AI tool that offers a browser extension to help users read, write, and learn more efficiently. It combines the power of fast information retrieval and GPT models, providing fact-checked and up-to-date information with links to relevant resources. Unlike ChatGPT, Sentelo is available 24/7 and can handle heavy loads. It is accessible and fast, compatible with various platforms such as Docs, Overleaf, PDF, and any website. Users can personalize Sentelo by selecting favorite functions from its prompt repository. The tool can be used to boost creativity by providing additional idea triggers, aid in comprehension and learning by creating control questions, and generate summaries of chapters for note-taking. Sentelo aims to be a helpful AI learning copilot by offering writing and summarizing capabilities to its users.