Pi Lens-Notes, PYQs on YouTube

Turn any educational YouTube video into a complete study session. Pi Lens sits alongside YouTube and gives you everything you need to actually learn from what you're watching - not just watch it.

Whether you’re preparing for you board exams Class 9-12, JEE, NEET, CUET, UPSC, State Boards, MHTCET,  Pi Lens helps you learn, revise, test concepts, practice and access curated notes instantly!

What Pi Lens gives you on every study video:

📚 Notes on any youtube video

Mindmap notes, formula sheets, short notes, lecture slides, and curated PDFs - all mapped to the chapters being taught in the Youtube video.

📋 Video Summary

A structured summary of the lecture, auto-generated from the video - so you can review in 2 minutes what took 90 minutes to watch.

📝 Previous Year Questions (PYQs)

Chapter-matched PYQs from the last 5 years' exam data, ready for you to practice anytime.

⚡ Instant Quiz

Test yourself on exactly what was taught in the video - questions built from the video’s content.

📊 Live Polls

Participate in real-time polls during PhysicsWallah’s live classes.

1,50,000+ students use Pi Lens on Android and Chrome to study smarter on YouTube.

🎯 Why students choose Pi Lens:

1. Made specifically for students who learn on Youtube

2. Zero friction: No searching for study material, find everything in one place

3. Minimal & distraction-free

4. Built for the students of India

⚠️ Important Disclaimer

Pi Lens is an independent educational tool and is not affiliated with or endorsed by YouTube.