AI-POWERED STUDY ASSISTANT BY

Learn smarter with Notes, Quizzes and PYQs

Pi Lens is a tool that converts any academic Youtube video into study content

Add to Chrome

Download the App

4.7 PlayStore Rating3 Lakh+ Learners4.8 ChromeStore Rating

Get Notes and Mindmaps on YouTube videos

NOTES

Get all Notes. With Zero effort.

Video Summary, Alakh Sir's notes, formula sheets and short notes pulled up automatically for the chapter you're watching.

Read Notes

QUIZ

Quiz when you're done.

Don't just watch and move on. Quiz yourself and remember more.

Try Quiz

PYQs

Many years of PYQs. Right here.

Past Year Questions from JEE, NEET, Boards and more, matched to the exact chapter you're studying.

Practice PYQs

POLLS

Attempt Poll. Stay ahead in the Live YouTube Class.

Answer live polls while you watch. See where you rank. Check leaderboard against everyone watching.

Try Polls

ASK AI

Your doubts, answered instantly.

Have a doubt mid-lecture? Pause and Ask AI. It reads the video context and gives you a precise answer.

Try Ask AI

CONCEPT LAB

Visualise every concept. Don't just memorise it.

Auto-generated mind maps, flashcards and simulations so the concept actually sticks.

View Concept Labs

How Pi Lens works

STEP 01
Install the extension
STEP 02
Open any YouTube video
STEP 03
Study smarter

Beyond Youtube

What Students L❤️ve

S
“Nice app for my NEET and JEE. I got 691/720 in NEET and 300/350 in JEE.”
Saurabh TatheJEE NEET Aspirant

L
“10/10. Pi Lens is not just a platform, it is an emotion. Every feature makes learning easier, smarter, and more enjoyable.”
Lalitendu BiswalJEE Aspirant

P
“The best app I have ever seen. Open YouTube, play the chapter video, and that's it — everything I need is at my fingertips.”
Prakash PremiClass 10 Student

S
“Well-organized notes, PYQs, practice questions and quizzes in one place. The notes are easy to understand and help me revise quickly.”
Salma RaniNEET Aspirant

H
“My favorite feature is how it summarizes long video lectures perfectly. It saves me so much time. Highly recommended!”
Himani RajwarUPSC Aspirant

G
“A very useful app for PYQs, advanced questions, notes and PDFs. Great for competitive aspirants.”
Geeta SinghClass 12 Student

Y
“This app is GOAT. It has a very big effect on my study. You should try it.”
Yograj SinghJEE Aspirant

A
“Smart notes, quizzes and instant doubt-solving help me understand topics quickly and save time.”
Ayush SharmaNEET Aspirant

S
“A fantastic free app for study — notes, PYQs and extra content on YouTube. It is a must-try.”
SiddhiClass 10 Student

R
“Pi Lens makes studying from YouTube super productive. Instant quizzes, PYQs and clean notes alongside the video.”
Rajul JainJEE Aspirant

R
“A very good app for students — you can get almost everything in one place.”
Royal KingClass 10 Student

Frequently Asked Questions

Does Pi Lens work on every YouTube video?

It works on any academic video longer than 5 minutes.

Do I need a PhysicsWallah account?

No. You can sign up on Pi Lens even without a PhysicsWallah account.

Is Pi Lens free to use?

Yes. Pi Lens is completely free to use.

Does it work only on PhysicsWallah videos?

No. Pi Lens works with any YouTube video — not just PhysicsWallah videos.

Does it work on mobile or laptop?

Yes — download the Pi Lens Android app for mobile. The Chrome extension is for desktop/laptop.

Is my data safe?

Your privacy is our priority. Your data stays yours. No data is misused. You can also permanently delete all your watch history video watched using Pi Lens anytime.