447+ Simulations · Free · No Install

Science you can see,
physics you can feel.

Interactive simulations for every concept in Class IX–XII. Built for JEE, NEET, and CBSE. Works offline, runs in any browser.

Why Pratyaksh

Built different,
built for India.

Every simulation is a self-contained HTML file — no frameworks, no CDN dependencies, no internet required. Download once, use forever.

Standalone HTML — truly offline

Each sim is one `.html` file. Save it to a USB, share on WhatsApp, open on a school projector — zero connectivity needed.

JEE / NEET / NCERT aligned

Topics mapped to Class IX–XII NCERT, with competition-depth parameters for JEE Main, Advanced, and NEET.

Classroom-ready in 10 seconds

Teachers can download any sim and project it on day one. No IT department, no setup, no excuses.

Aha-moment pedagogy

Every sim is designed around one core insight — adjust a parameter, watch the concept reveal itself, understand it forever.

📁 pratyaksh-site/

📄 index.html ← you are here

📁 sims/

📁 physics/

projectile-motion.html

youngs-double-slit.html

bohr-atom.html

… 178 more

📁 chemistry/

periodic-trends.html

… 155 more

📁 maths/

📁 biology/