Google launched Notebooks in Gemini on April 8, creating a shared project workspace that syncs bidirectionally with NotebookLM. Sources added in either app — PDFs, documents, URLs, YouTube videos — appear automatically in the other, and users can invoke NotebookLM-exclusive features like Video Overviews and Infographics from within Gemini. The feature is rolling out first to AI Ultra, Pro, and Plus subscribers on the web, with mobile and free-tier access to follow.