Pi Lens-Notes, PYQs on YouTube, developed by PhysicsWallah, is an educational app designed to make YouTube-based learning more structured. It sits alongside YouTube as an independent educational tool and is not affiliated with or endorsed by YouTube.

The app provides study resources such as notes, summaries, previous year questions (PYQs), quizzes, and live-class polls for students preparing for Class 9–12 board exams and competitive exams including JEE, NEET, CUET, UPSC, State Boards, and MHTCET.

Video notes and practice tools

For educational YouTube videos, Pi Lens provides chapter-mapped materials related to the topic being taught. These include mind map notes, formula sheets, short notes, lecture slides, and curated PDFs. The app also offers structured, auto-generated video summaries, helping students review long lectures more quickly.

For practice, Pi Lens provides chapter-matched PYQs based on the last five years of exam data. It also supports active recall through instant quizzes built from the content of the video being watched, giving students a way to check their understanding soon after studying a topic. The app includes live polls as well, though this feature is specifically available during PhysicsWallah’s live classes rather than across all YouTube videos.

A practical tool for more active YouTube learning

Pi Lens helps students get more out of YouTube study videos by keeping notes, summaries, PYQs, quizzes, and live-class activities close at hand. It makes revision feel more organized and encourages learners to check their understanding while the lesson is still fresh.