Science labs you can actually play with

iLabs is a set of free, interactive science labs for students. It started as a chemistry reaction sandbox (now called Re-agents) and has grown to include Forces, a set of physics labs, Shunya, a set of maths labs, and Jeeva, a set of biology labs — all four subjects are now open.

Every lab is free and there is no account or sign-up.

School students in classes 9 to 12 (especially those following NCERT), teachers who want a live classroom demo, and anyone who learns better by trying things than by reading about them.

Shunya is iLabs' maths lab for class 9 to 12. It has the Function and Graph Explorer (drag the sliders for a line, a quadratic or a polynomial and watch the graph, roots and vertex change live, or type any function) a Trigonometry and Heights-and-Distances lab (the unit circle, right triangles, and angle-of-elevation problems you solve by dragging) and a Probability and Statistics lab (flip coins and roll dice thousands of times, draw balls from a bag, drag data points to move the mean and median, group data, and explore the binomial and normal curves). It also has a Geometry and Constructions lab (drag triangles and quadrilaterals, test congruence, similarity and Pythagoras, and follow compass-and-ruler constructions step by step). It also has a Circles and Conic Sections lab (test the circle theorems and tangents, work out arcs and sectors, and explore the parabola, ellipse and hyperbola with draggable foci, directrices and eccentricity). There is also a Calculus Lab (approach a limit, shrink a secant into a tangent, find maxima and minima, solve optimisation problems, watch rectangles add up to an integral, and follow slope fields for differential equations). It also has a Matrices and Transformations lab (drag a matrix and watch the plane stretch, turn and flip, multiply matrices with every entry worked out, find determinants and inverses, and solve linear systems by row reduction, the matrix method and Cramer's rule). There is also a Maths Explainers lab (why decimals repeat and how a square root sits on the number line, complex numbers on the Argand plane, counting with trees and Pascal's triangle, AP and GP series, Venn diagrams and linear programming). There is also a Mensuration and 3D Shapes lab (rotate cuboids, cylinders, cones, spheres and frustums in 3D for live surface areas and volumes, check Heron's formula on a triangle you drag, unfold the nets, combine solids and melt one solid into many). There is a Vectors and 3D Geometry lab (drag vectors, turn a 3D scene to see the dot and cross product and the volume of a box, and explore skew lines, planes, shortest distances and angles between lines and planes), and a Vedic Math Shortcuts lab (multiply by 11 in your head, square a number ending in 5, Nikhilam, vertically-and-crosswise and more, each with a live practice box). Shunya also has 50 Maths Myths & Paradoxes, a 197-question quiz, 8 timed games, a searchable formula sheet and a 25-mathematician history timeline.

Jeeva is iLabs' biology subject for classes 9 to 12 (jeeva means life in Sanskrit). It has fifteen interactive labs: the Anatomy Lab (the human body in 3D, male or female, with a detailed model of every organ), the Insectarium (15 insects in 3D), the Dissection Lab (a cockroach and a frog, with no animal used), the Plant Lab, the Microbe Lab, the Cell Lab (organelles, mitosis and meiosis), the Physiology Lab, the Animal Lab (the animal kingdom), the Genetics Lab (Mendel, DNA and evolution), the Reproduction Lab, the Health and Microbes Lab, the Biotechnology Lab, the Ecology Lab, the Living World Lab and the Earth as a System Lab. It also has a Biology quiz with more than 600 questions, four games and the NCERT biology syllabus map for class 9 to 12.

Open the Anatomy Lab to see the human body in 3D, male or female, with 11 body systems and over 90 parts. Turn it, explode it, slice it, switch systems on and off, follow food, air, blood or a nerve signal on a journey, try what-if cases such as a blocked artery, and click any organ to study its own 3D model with notes and practice questions.

Re-agents is iLabs' chemistry lab: a reaction sandbox with 280+ real balanced equations, an interactive periodic table of all 118 elements, lessons, mnemonics, games and a 204-question quiz.

Forces is iLabs' physics lab for classes 9 to 12: fifteen interactive labs (mechanics, work power and energy, Newton's laws and friction, refraction and prisms, magnetism, gravitation, fluids and elasticity, circuits, optics, waves, rotation, thermodynamics, electromagnetism, logic gates and modern physics with animated explainers), lessons, a quiz, games and a constants reference.

Yes. Every lab works in a modern mobile browser, though the bigger labs are easier on a tablet or laptop.

The labs use real formulas and reaction data rather than pre-made animations. Where a lab simplifies something (for example, ideal components in the circuit builder), it says so on the page.