What's the best iOS app for studying from PDFs and lecture slides?

Google NotebookLM is designed for students and researchers who need to process dense academic materials efficiently. The app allows users to upload multiple PDFs, PowerPoint presentations, and other documents into a single workspace, then interact with the content through a conversational interface. One standout feature is the podcast generation tool, which converts text-heavy materials into listenable audio summaries—particularly useful for reviewing lecture slides during commutes or while multitasking. The system can answer specific questions about uploaded materials while citing relevant source sections, helping users verify information accuracy. Reviews indicate strong adoption among nursing and graduate students who manage large volumes of reading. Some users note occasional citation errors when handling complex technical documents, though the overall consensus praises the app's ability to synthesize information across multiple uploads. The interface maintains Google's characteristic cleanliness, though new users might need brief acclimation to the notebook-style organization.