Chemistry
Build an Atom
Build isotopes and ions from subatomic particles.
Learning apps
A growing collection of small games, visual explorations, and interactive widgets for learning.
Guess the Equation
Solve the daily equation in six guesses.
Nonogram
Reveal the daily picture with row and column clues.
Sudoku 6×6
Complete the daily 6×6 logic grid.
Logic Gates
Flip the input switches so every output lamp matches its goal pattern in as few moves as possible.
Fraction Helper
See fractions as pies, bars, and a number line.
Unit Converter
Convert units across length, mass, time, and more.
Unit Circle
Drag an angle and watch sine and cosine move.
Shape Explorer
Explore 2D shapes with live formulas.
3D Geometry
Rotate solids and read volume and surface area.
Graphing
Tune functions and watch the curve change.
Incline Forces
See how gravity, friction, and force interact.
Projectile Motion
Launch a ball and watch gravity shape the arc.
Pendulum Lab
Swing a pendulum and watch energy trade places.
Doppler Effect
Move a source past a listener and watch the wavefronts compress and stretch.
Optics Bench
Pick a lens or mirror, drag the object, and watch the principal rays form the image.
Bending Light
Aim a laser and watch refraction bend the beam.
Waves
Drive a string and watch waves reflect.
Diffraction & Interference
Pick the slit count, sweep wavelength and slit spacing, and read the principal maxima off the screen.
Magnetic Field
Drag sources, switch between iron-filings and field-line views, and read the local field with a draggable compass.
Ice to Steam
One flask of water — freeze it, boil it, and peek inside at the molecules.
pH Mixer
Drip acid or base and watch the pH shift.
Virtual Lab
Drop metals into water and watch reactions unfold.
Build an Atom
Build isotopes and ions from subatomic particles.
3D Molecules
Drag to rotate; toggle lone pairs; read the geometry name and bond angle right off the screen.
Derivative Explorer
Drag along a curve and watch the tangent slope.
Geometry Theorems
Explore classic theorems with draggable proofs.
Equation Balancer
Balance chemical equations with integer coefficients.
Punnett Square
Cross parents and watch inheritance ratios appear.
Build a Cell
Build cells with the right organelles.
Cell 3D
Explore generated plant and animal cell models in 3D.
Human Body Atlas
Inspect generated human body models and organ imagery with selectable anatomy landmarks.
Solar System
Explore the planets, the Moon's phases, and eclipses in one 3D model.
Marbleslides
Type an equation, hit launch, watch the marbles slide into the stars.
Optics Puzzle
Drag the mirrors so the laser reflects off them and reaches the glowing target.
Probability Playground
Flip, roll, spin, drop. Theory vs reality, live.
Conic Sections
Tilt the plane and watch the conic shape change.
Double Pendulum
Watch chaos emerge from two coupled pendulums.
Tower of Hanoi
Move all disks to the right peg — never on a smaller one.
Minesweeper
Classic Minesweeper with optional probability hints.
Sorting Visualizer
Watch six classic sorting algorithms race side by side.
Pathfinding
Compare BFS, DFS, Dijkstra, and A* on a grid maze.