104 live simulators across 9 subjects. Search or filter by subject, class, topic or difficulty. Class matches follow CBSE/NCERT topics as a guide; check your current syllabus.
Watch sorting, searching, trees, heaps and graph algorithms run one step at a time, with animated visuals you can pause and replay.
Class 11–12 · College & beyondClass 11–12 Computer Science: searching, sorting and stacks
Launch simulator: Algo Simulator
Build architectures from load balancers, caches, queues and databases, then watch traffic flow and see where they break.
College & beyondSoftware engineering: system design
Launch simulator: System Design Simulator
Follow a card transaction from the terminal through the payment switch to the issuing bank and back, including ISO 8583 messages and NCMC.
College & beyondPayments and banking systems
Launch simulator: Card Payment Switch Simulator
Build atoms by adding protons, neutrons and electrons, and see how the element, charge and isotope change.
Class 9–10 · Class 11–12Class 9 Science: Structure of the Atom; Class 11 Chemistry: Structure of Atom
Launch simulator: Atom Lab
Launch a projectile, change angle, speed, gravity, height and air drag, and compare trajectories, range and flight time.
Class 11–12Class 11 Physics: Motion in a Plane
Launch simulator: Projectile Motion
Swing a simple pendulum, change length, gravity, amplitude and damping, and compare the measured period with the small-angle formula.
Class 6–8 · Class 11–12Class 7 Science: measurement of time and motion; Class 11 Physics: Oscillations
Launch simulator: Pendulum
Oscillate a mass on a spring, change mass, stiffness and damping, and watch kinetic, elastic and lost energy trade places.
Class 11–12Class 11 Physics: Oscillations
Launch simulator: Spring and Mass
Collide two carts on a track, change their masses, velocities and restitution, and check momentum and kinetic energy before and after.
Class 9–10 · Class 11–12Class 9 Science: Force and Laws of Motion (momentum); Class 11 Physics: Work, Energy and Power
Launch simulator: Collisions
Put a block on a ramp, change slope, mass and friction, resolve the forces and predict whether it slides.
Class 11–12Class 11 Physics: Laws of Motion (friction, resolving forces)
Launch simulator: Inclined Plane
Spin an object around a circle, change radius, speed and mass, and inspect centripetal acceleration, force and what happens when the string is cut.
Class 11–12Class 11 Physics: Motion in a Plane; Laws of Motion
Launch simulator: Circular Motion
Launch a satellite around a planet, change its starting speed and direction, and compare circular, elliptical and escape trajectories.
Class 9–10 · Class 11–12Class 9 Science: Gravitation; Class 11 Physics: Gravitation
Launch simulator: Orbital Motion
Add two travelling waves, change their amplitude, frequency and phase, and watch superposition create constructive, destructive interference and beats.
Class 11–12Class 12 Physics: Wave Optics
Launch simulator: Wave Interference
Drive a string fixed at both ends, change length, tension, density and frequency, and find the resonant harmonics.
Class 11–12Class 11 Physics: Waves
Launch simulator: Standing Waves
Move a sound source and a listener, watch wavefronts bunch up and spread out, and compare emitted and received frequency.
Class 11–12 · College & beyondClass 11 Physics: Waves
Launch simulator: Doppler Effect
Drag an object in front of a thin lens, change the focal length, and trace the principal rays to find the image position, size and type.
Class 9–10 · Class 11–12Class 10 Science: Light – Reflection and Refraction; Class 12 Physics: Ray Optics
Launch simulator: Geometric Optics
Shine a ray between two media, change refractive indices and incidence angle, and find the critical angle and total internal reflection.
Class 9–10 · Class 11–12Class 10 Science: Light – Reflection and Refraction; Class 12 Physics: Ray Optics
Launch simulator: Refraction
Heat a metal rod, choose the material and end temperatures, and watch the temperature profile relax towards a straight-line steady state.
Class 6–8 · Class 11–12Class 7 Science: heat and conduction; Class 11 Physics: Thermal Properties of Matter
Launch simulator: Heat Diffusion
Squeeze, heat and fill a gas-filled piston, hold one quantity constant, and see Boyle's, Charles's and Gay-Lussac's laws emerge from bouncing particles.
Class 11–12Class 11 Physics: Kinetic Theory (gas laws)
Launch simulator: Gas Laws
Place and drag positive and negative charges, and visualise the electric field vectors, field lines and equipotential contours they create.
Class 11–12Class 12 Physics: Electric Charges and Fields
Launch simulator: Electric Fields
Charge and discharge a capacitor through a resistor, change R, C and the supply voltage, and read the time constant from the exponential curves.
Class 11–12 · College & beyondClass 12 Physics: Electrostatic Potential and Capacitance
Launch simulator: RC Circuit
Drive a series RLC circuit with an AC source, sweep the frequency, and inspect current amplitude, phase and the sharpness of resonance.
Class 11–12 · College & beyondClass 12 Physics: Alternating Current (resonance)
Launch simulator: RLC Resonance
Push a bar magnet through a coil, change speed, turns and magnet strength, and connect the changing magnetic flux to the induced voltage.
Class 11–12Class 12 Physics: Electromagnetic Induction
Launch simulator: Electromagnetic Induction
Push water through a pipe that narrows and widens, change areas and flow rate, and compare speed and idealised pressure along the pipe.
Class 11–12Class 11 Physics: Mechanical Properties of Fluids
Launch simulator: Fluid Continuity
Drop blocks of different densities into different liquids, predict whether they float and how deep, and see Archimedes' principle balance the forces.
Class 9–10 · Class 11–12Class 9 Science: Gravitation (thrust, buoyancy, Archimedes' principle); Class 11 Physics: Fluids
Launch simulator: Buoyancy
Run a reaction A + B → C, change temperature, concentration and activation energy, and compare particle collisions with the rate law and Arrhenius equation.
Class 11–12Class 12 Chemistry: Chemical Kinetics
Launch simulator: Reaction Rates
Run a reversible reaction A ⇌ B to equilibrium, then add reactant, remove product or change temperature, and watch Le Chatelier's principle at work.
Class 11–12Class 11 Chemistry: Equilibrium
Launch simulator: Chemical Equilibrium
Add base from a burette to an acid, graph the pH curve, and identify the equivalence point, buffer region and a suitable indicator.
Class 9–10 · Class 11–12Class 10 Science: Acids, Bases and Salts; Class 11 Chemistry: Equilibrium (ionic)
Launch simulator: Acid–Base Titration
Release two gases on either side of a barrier, change temperature and particle count, and compare mixing with random-walk displacement statistics.
Class 6–8 · Class 9–10Class 9 Science: Matter in Our Surroundings (diffusion)
Launch simulator: Molecular Diffusion
Build a galvanic cell from two half-cells, see which electrode is the anode, follow electron and ion flow, and calculate the cell voltage with the Nernst equation.
Class 11–12Class 12 Chemistry: Electrochemistry
Launch simulator: Electrochemical Cell
Spot a mixture on a strip, change each dye's affinity and the solvent flow, and watch components separate by retention factor.
Class 6–8 · Class 9–10 · Class 11–12Class 6 Science: separating substances; Class 11 Chemistry: methods of purification
Launch simulator: Chromatography
Watch a sample of unstable nuclei decay at random, change half-life and starting count, and compare the stochastic count with the exponential expectation.
Class 11–12 · College & beyondClass 12 Physics: Nuclei
Launch simulator: Radioactive Decay
Drop a hot metal into water in an insulated cup, change masses, materials and temperatures, and solve the energy balance for the final temperature.
Class 11–12Class 11 Physics: Thermal Properties of Matter; Class 11 Chemistry: Thermodynamics
Launch simulator: Calorimetry
Dissolve salts in water, change temperature and amount, and see when a solution becomes saturated and excess solid remains or crystallises out.
Class 9–10 · Class 11–12Class 9 Science: Is Matter Around Us Pure (solutions); Class 12 Chemistry: Solutions
Launch simulator: Solubility
Move a sample of water or carbon dioxide around its pressure–temperature phase diagram and see where it is solid, liquid, gas or supercritical.
Class 11–12 · College & beyondExtends Class 9 states of matter; phase diagrams are college level
Launch simulator: Phase Diagram
Evolve a population of moths on light and dark bark, change the selection pressure and mutation rate, and track trait frequencies across generations.
Class 11–12Class 12 Biology: Evolution
Launch simulator: Natural Selection
Choose parental alleles for one or two genes, build the Punnett square, and compare expected offspring ratios with a random sample of offspring.
Class 9–10 · Class 11–12Class 10 Science: Heredity; Class 12 Biology: Principles of Inheritance and Variation
Launch simulator: Genetic Crosses
Model rabbits and foxes with the Lotka–Volterra equations, change growth and predation rates, and inspect population cycles and the phase-plane orbit.
Class 11–12 · College & beyondClass 12 Biology: Organisms and Populations (population interactions)
Launch simulator: Predator and Prey
Run the SIR model of an epidemic, change transmission, recovery and vaccination, and compare peak size, timing and final outbreak size.
Class 11–12 · College & beyondClass 12 Biology: Human Health and Disease; the SIR model is college level
Launch simulator: Epidemic Dynamics
Change substrate concentration, Vmax, Km and inhibitor type, and read reaction velocity curves and Lineweaver–Burk plots.
Class 11–12 · College & beyondClass 11 Biology: Biomolecules (enzymes)
Launch simulator: Enzyme Kinetics
Stimulate a model neuron, change stimulus strength and membrane properties, and watch threshold, action potentials, refractory periods and firing rate.
Class 9–10 · Class 11–12 · College & beyondClass 10 Science: Control and Coordination; Class 11 Biology: Neural Control and Coordination
Launch simulator: Neuron Signals
Separate two solutions with a semi-permeable membrane, change concentrations and permeability, and watch net water movement and osmotic pressure.
Class 9–10 · Class 11–12Class 9 Science: The Fundamental Unit of Life (osmosis); Class 12 Chemistry: Solutions (osmotic pressure)
Launch simulator: Osmosis
Adjust light intensity, carbon dioxide and temperature for a leaf, and explore which factor limits the rate of photosynthesis.
Class 6–8 · Class 9–10 · Class 11–12Class 7 Science: nutrition in plants; Class 10 Science: Life Processes; Class 11 Biology: Photosynthesis in Higher Plants
Launch simulator: Photosynthesis
Change species populations in a small grassland food web and follow how a change in one species ripples through the others.
Class 6–8 · Class 9–10 · Class 11–12Class 10 Science: Our Environment (food chains and webs); Class 12 Biology: Ecosystem
Launch simulator: Food Web
Run many populations at once under pure chance (Wright–Fisher model), change population size, and compare how fast alleles fix or vanish.
Class 11–12 · College & beyondClass 12 Biology: Evolution (Hardy–Weinberg, genetic drift)
Launch simulator: Genetic Drift
Move a point along a curve and shrink the secant interval to see the secant slope approach the derivative, with the derivative curve traced live.
Class 11–12Class 11 Maths: Limits and Derivatives; Class 12 Maths: Application of Derivatives
Launch simulator: Derivative Explorer
Approximate the area under a curve with left, right, midpoint and trapezoid sums, change partitions and bounds, and watch the error shrink.
Class 11–12Class 12 Maths: Integrals; Application of Integrals
Launch simulator: Integral Explorer
Build square, sawtooth and triangle waves by adding sine harmonics, inspect the spectrum, and see the Gibbs overshoot at jumps.
College & beyondFourier series: college mathematics and engineering
Launch simulator: Fourier Synthesis
Edit a 2×2 matrix and watch it transform a grid, the basis vectors and a shape, with determinant, eigenvectors and animation from the identity.
Class 11–12 · College & beyondClass 12 Maths: Matrices
Launch simulator: Linear Transformations
Drag two complex numbers on the Argand plane and see addition as vector sum, multiplication as rotate-and-scale, and powers and roots as spirals.
Class 11–12Class 11 Maths: Complex Numbers
Launch simulator: Complex Plane
Roll down a loss landscape with gradient descent, change the learning rate, start point and momentum, and see convergence, oscillation and divergence.
Class 11–12 · College & beyondBuilds on Class 12 Maths: Application of Derivatives (maxima and minima)
Launch simulator: Gradient Descent
Pick a distribution, change its parameters, draw random samples and compare the histogram with the theoretical curve, mean and spread.
Class 11–12 · College & beyondClass 12 Maths: Probability
Launch simulator: Probability Distributions
Take repeated samples from skewed or lumpy distributions, plot the sample means, and watch them form a normal curve as the sample size grows.
College & beyondCollege statistics
Launch simulator: Central Limit Theorem
Set a prior, observe evidence such as test results or coin flips, and watch the posterior probability update with Bayes' theorem.
Class 11–12 · College & beyondClass 12 Maths: Probability (Bayes' theorem)
Launch simulator: Bayesian Updating
Throw random points at a square to estimate π or the area under a curve, and watch the error shrink in proportion to one over the square root of the sample count.
Class 9–10 · Class 11–12Class 10 Maths: Probability (estimating π with random points)
Launch simulator: Monte Carlo Estimation
Add, drag and delete data points and watch the least-squares line, residuals, R² and the pull of outliers update live.
Class 11–12 · College & beyondClass 11 Economics: Statistics for Economics (correlation); regression is college level
Launch simulator: Regression
Simulate thousands of experiments, change effect size, sample size and significance level, and measure false positives, power and p-values.
College & beyondCollege statistics
Launch simulator: Hypothesis Testing
Edit transition probabilities between weather states, simulate a random walk through the chain, and compare visit frequencies with the stationary distribution.
College & beyondCollege probability
Launch simulator: Markov Chains
Draw cells on a grid, set birth and survival rules, and watch Conway's Game of Life and other automata produce gliders, oscillators and chaos.
College & beyondBeyond the syllabus: complex systems
Launch simulator: Cellular Automata
Explore the Mandelbrot set, Julia sets, the Koch snowflake and a fractal tree, changing iteration depth and parameters to see self-similar detail.
Class 11–12 · College & beyondBuilds on Class 11 Maths: Complex Numbers
Launch simulator: Fractals
Tune separation, alignment and cohesion for a flock of boids and watch coordinated flocking emerge from simple local rules, with a predator option.
College & beyondBeyond the syllabus: complex systems
Launch simulator: Flocking
Generate a toy RSA key from two primes, encrypt and decrypt a message step by step, sign it, and see why factoring the modulus breaks the key.
Class 11–12 · College & beyondBuilds on Class 10 Maths: Real Numbers (primes); Class 11 Computer Science: cyber safety
Launch simulator: RSA Cryptography
Insert keys into a hash table, compare chaining, linear probing and quadratic probing, and measure collisions, cluster lengths and probe counts as the load factor grows.
College & beyondCollege data structures
Launch simulator: Hash Tables
Place current-carrying wires going into and out of the page, and visualise the magnetic field lines, strength and direction they create, including coils and parallel-wire forces.
Class 9–10 · Class 11–12Class 10 Science: Magnetic Effects of Electric Current; Class 12 Physics: Moving Charges and Magnetism
Launch simulator: Magnetic Fields
Edit process arrival and burst times, then compare FCFS, SJF, SRTF, priority and round-robin schedules on a Gantt chart with waiting and turnaround times.
College & beyondCollege operating systems
Launch simulator: CPU Scheduling
Feed a page reference string through FIFO, LRU, Optimal and Clock replacement, change the number of frames, and compare page faults including Bélády's anomaly.
College & beyondCollege operating systems
Launch simulator: Page Replacement
Send memory addresses through direct-mapped, set-associative and fully associative caches, see tag, index and offset bits, and compare hit rates and conflict misses.
College & beyondCollege computer organisation
Launch simulator: Cache Mapping
Assign resources to processes, draw the resource-allocation graph, detect cycles, and run the Banker's algorithm to find safe sequences.
College & beyondCollege operating systems
Launch simulator: Deadlock
Compare a full table scan with a B-tree index lookup on generated data, change table size and query selectivity, and count the rows and pages each one touches.
Class 11–12 · College & beyondClass 12 Computer Science: Database Concepts and SQL
Launch simulator: Database Indexes
Interleave two database transactions step by step under different isolation levels and watch dirty reads, non-repeatable reads, lost updates and write skew appear or get blocked.
College & beyondCollege databases
Launch simulator: Transaction Isolation
Build an object graph with roots and references, drop roots, and watch mark-and-sweep and reference counting find garbage, including leaked cycles.
College & beyondCollege programming languages
Launch simulator: Garbage Collection
Type an arithmetic expression and follow it through tokenising, parsing into a syntax tree, stack-machine code generation and evaluation, with clear error messages.
College & beyondCollege compilers
Launch simulator: Compiler Pipeline
Toggle inputs on digital circuits from single gates to a half adder, full adder and SR latch, trace signal propagation, and generate truth tables.
Class 11–12 · College & beyondClass 11 Computer Science: Computer Systems (Boolean logic)
Launch simulator: Logic Gates
Step a deterministic finite automaton through an input string, edit its transitions, and see which strings it accepts, from binary divisibility to turnstiles.
College & beyondCollege theory of computation
Launch simulator: Finite State Machines
Encode 4 data bits with Hamming(7,4), flip bits in transit, compute the syndrome, and see single errors corrected and the limits when two bits flip.
College & beyondCollege networks and coding theory
Launch simulator: Error-Correcting Codes
Simulate customers arriving at random and being served by one or more servers, change arrival and service rates, and compare queue length and waiting time with M/M/c theory.
College & beyondCollege operations research
Launch simulator: Queueing Systems
Run a shop's stock day by day with random demand, set the reorder point, order quantity and lead time, and compare stockouts, holding cost and ordering cost.
College & beyondCollege operations management
Launch simulator: Inventory Control
Run a four-stage retailer–wholesaler–distributor–factory chain, change demand and delays, and watch small changes in consumer demand amplify into the bullwhip effect.
College & beyondCollege operations management
Launch simulator: Supply Chain
Simulate a serial production line, change station times, variability and buffer sizes, and find the bottleneck that sets throughput.
College & beyondCollege operations management
Launch simulator: Assembly Line
Time a fixed-cycle traffic signal at a two-phase junction, change green times and arrival rates, and compare measured queues and delay with Webster's formula.
College & beyondCollege transport engineering
Launch simulator: Traffic Signals
Run one lift in a ten-floor building, add calls by clicking floors, and compare first-come-first-served, nearest-stop-first and the classic sweep (elevator) algorithm on waiting time and fairness.
College & beyondCollege operations research
Launch simulator: Elevator Dispatch
Place items to pick in a six-aisle warehouse and compare the walking distance of return, S-shape, nearest-neighbour and optimal picking routes.
College & beyondCollege operations research
Launch simulator: Warehouse Picking
Edit task durations and dependencies in a small building project, and watch the critical path method find the project length, the critical path and every task's slack.
College & beyondCollege project management
Launch simulator: Project Scheduling
Enter hypothetical bidder values and bids, compare who wins and what they pay under first-price, second-price, English and Dutch auctions, and test revenue equivalence over many random auctions.
College & beyondCollege economics
Launch simulator: Auction Mechanisms
Shift linear supply and demand curves, add a tax, price ceiling, price floor or quota, and inspect the modelled equilibrium, consumer and producer surplus, and deadweight loss.
Class 11–12 · College & beyondClass 12 Economics: Introductory Microeconomics (demand, supply, market equilibrium)
Launch simulator: Market Supply and Demand
Change latitude, date, time of day, panel tilt and orientation, and see the sun's path across the sky, the angle at which sunlight strikes the panel, and idealized daily energy.
Class 6–8 · Class 11–12Class 6 Social Science: Earth's motions and seasons; Class 11 Geography: Solar Radiation, Heat Balance and Temperature
Launch simulator: Solar Panel Geometry
Change wind speed, rotor size, air density and rotor control, and inspect a bounded power model with the cube law, the Betz limit, tip-speed ratio and a rated-power cap.
Class 9–10 · College & beyondBuilds on Class 9 Science: Work and Energy (kinetic energy)
Launch simulator: Wind Turbine
Size an off-grid solar battery system, set load and generation profiles, and track state of charge, unmet demand and spilled energy hour by hour.
Class 11–12 · College & beyondBuilds on Class 12 Chemistry: Electrochemistry (batteries)
Launch simulator: Battery Storage
Trip a power station or add load, and watch a simplified grid's frequency fall and recover through inertia, governor droop and automatic generation control.
College & beyondCollege power systems
Launch simulator: Grid Frequency
Choose wall and roof insulation, glazing and air-tightness for a two-storey house, set the weather, and compare U-values, the temperature profile through the wall, and idealized heat loss.
Class 11–12 · College & beyondClass 11 Physics: Thermal Properties of Matter (conduction)
Launch simulator: Building Insulation
Set rainfall pattern, roof size, tank capacity and daily use, then run a year of daily water balance and track tank level, overflow and shortages.
Class 6–8 · Class 9–10Class 10 Geography: Water Resources (rainwater harvesting)
Launch simulator: Rainwater Harvesting
Change storm size and land cover for a small catchment, and compare simplified runoff curves and flood hydrographs with the SCS curve number method.
Class 9–10 · College & beyondClass 10 Geography: Water Resources
Launch simulator: Watershed Runoff
Run a four-reservoir carbon cycle box model from 1850 to 2200, change future emissions and exchange rates, and track atmospheric CO₂ and where the emitted carbon goes.
Class 11–12 · College & beyondClass 11 Geography: World Climate and Climate Change
Launch simulator: Carbon Cycle
Change a city surface's colour, shade, vegetation and heat storage, and compare an illustrative surface energy balance and day–night temperatures with a grass park.
Class 11–12 · College & beyondClass 11 Geography: Solar Radiation, Heat Balance and Temperature
Launch simulator: Urban Heat
Follow 100 tonnes of packaging through collection, sorting and reprocessing, change collection, contamination, sorting accuracy and purity limits, and track how much becomes new material over repeated cycles.
Class 6–8 · Class 9–10Class 10 Science: Our Environment (managing waste)
Launch simulator: Recycling Systems
Tune proportional, integral and derivative gains on a mass–spring–damper, add a disturbance and actuator limits, and inspect overshoot, settling time and steady-state error.
College & beyondCollege control engineering
Launch simulator: PID Control
Set joint angles or drag a target for a two-link planar robot arm, and inspect forward and inverse kinematics, elbow-up and elbow-down solutions, reachability, and joint versus straight-line motion.
Class 11–12 · College & beyondBuilds on Class 11 Maths: Trigonometric Functions
Launch simulator: Robot Arm
Change tooth counts in simple and compound gear trains, and inspect rotation direction, speed ratio and ideal output torque with animated meshing gears.
Class 6–8 · College & beyondBuilds on Class 6–8 Maths: ratio and proportion
Launch simulator: Gear Trains
Load a simply supported or cantilever beam with point and distributed loads, change span, material and cross-section, and inspect deflection, bending moment, shear and stress in the small-deflection Euler–Bernoulli model.
College & beyondCollege structural engineering
Launch simulator: Beam Deflection
Load stable truss presets (A-frame, Pratt, Howe and Warren), change span, height and loads, and visualize tension and compression in every member found by the method of joints.
Class 11–12 · College & beyondBuilds on Class 11 Physics: Laws of Motion (equilibrium of forces)
Launch simulator: Truss Forces
Mount a machine on springs and dampers over a shaking floor, change mass, stiffness, damping and excitation frequency, and compare transmissibility and resonance.
Class 11–12 · College & beyondClass 11 Physics: Oscillations (forced oscillations, resonance)
Launch simulator: Vibration Isolation
Change a signal's frequency and the sampling rate, observe aliasing, compare sinc and staircase reconstruction, and see how quantization bits limit precision.
College & beyondCollege signals and systems
Launch simulator: Digital Sampling
Adjust low-pass, high-pass, band-pass and notch filters, inspect their frequency response on a decibel scale, see what they do to hum, a tone and hiss, and optionally listen to the result.
College & beyondCollege signals and systems
Launch simulator: Audio Filtering
Edit a 3 × 3 kernel and step through convolution pixel by pixel to see how blur, sharpening and edge detection transform a small test image.
College & beyondCollege image processing
Launch simulator: Image Convolution
Edit sample text, build its Huffman code tree, compare bit counts with plain and fixed-length codes and the entropy limit, and watch the bits decode one by one.
College & beyondCollege information theory
Launch simulator: Compression CodingTry a different word, or clear the filters.