34 apps
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Math
4.73 ratings8.7K
Recursion Explorer
See each term of a sequence built from the one before — in math and in Python.
Math
55 ratings5K
Proofs without words
See why (a+b)² = a² + 2ab + b² — drag a square apart and let the areas prove it.
Math
4.52 ratings3K
Interest Lab
Same deposit, same rate, two outcomes. See where compound interest wins.
Math
51 rating1.8K
Solids of Revolution
Design an axial section, spin it, and work out V and S.
Math
4.52 ratings2K
Vectors
Draw vectors in the plane and in space, and watch every product work itself out.
Physics
4.73 ratings2.2K
Color Models
Mix light, ink, and hue — watch RGB, CMYK, and HSV make the very same color.
Math
4.3214 ratings29.9K
Tower of Hanoi
Move all disks to the right peg — never on a smaller one.
Biology
4.3155 ratings28.8K
Human Body Atlas
Pick an organ off the body map, turn it in your hands, and name every structure.
Biology
4.6129 ratings22.3K
Cell 3D
Explore generated plant and animal cell models in 3D.
Chemistry
4.5145 ratings21.7K
Build an Atom
Build isotopes and ions from subatomic particles.
Physics
4.4102 ratings19.8K
Solar System
Explore the planets, the Moon's phases, and eclipses in one 3D model.
Chemistry
4.571 ratings13.1K
Virtual Lab
Drop metals into water and watch reactions unfold.
Chemistry
4.664 ratings10.9K
3D Molecules
Drag to rotate, toggle lone pairs, and read the geometry and bond angle.
Chemistry
4.4112 ratings8.9K
Ice to Steam
One flask of water — freeze it, boil it, and peek inside at the molecules.
Chemistry
4.644 ratings8.6K
pH Mixer
Drip acid or base and watch the pH shift.
Math
4.239 ratings6.8K
Unit Circle
Drag an angle and watch sine and cosine move.
Math
4.544 ratings5.3K
3D Geometry
Rotate solids, read volume and surface area, and compare equal-volume shapes.
Physics
4.338 ratings5.1K
Incline Forces
See how gravity, friction, and force interact.
Physics
4.638 ratings4.8K
Double Pendulum
Watch chaos emerge from two coupled pendulums.
Math
3.317 ratings3.4K
Pathfinding
Compare BFS, DFS, Dijkstra, and A* on a grid maze.
Physics
4.612 ratings3.4K
Magnetic Field
Drag magnets and wires, switch views, and read the field with a compass.
Math
4.711 ratings3.4K
Probability Playground
Flip, roll, spin, drop. Theory vs reality, live.
Physics
4.614 ratings3.2K
Waves
Drive a string and watch waves reflect.
Math
4.428 ratings3.1K
Geometry Theorems
Explore classic theorems with draggable proofs.
Physics
4.419 ratings2.9K
Projectile Motion
Launch a ball and watch gravity shape the arc.
Physics
4.517 ratings2.9K
Bending Light
Aim a laser and watch refraction bend the beam.
Physics
4.817 ratings2.8K
Pendulum Lab
Swing a pendulum and watch energy trade places.
Physics
4.120 ratings2.8K
Optics Bench
Pick a lens or mirror, drag the object, and watch the rays form the image.
Math
4.68 ratings2.8K
Derivative Explorer
Drag along a curve and watch the tangent slope.
Physics
4.47 ratings2.8K
Doppler Effect
Move a source past a listener and watch the wavefronts compress and stretch.
Math
4.17 ratings2.8K
Conic Sections
Tilt the plane and watch the conic shape change.
Physics
4.324 ratings2.8K
Diffraction & Interference
Set slit count, wavelength and spacing, then read the maxima off the screen.
Math
4.512 ratings2.8K
Shape Explorer
Explore 2D shapes with live formulas.
Math
4.220 ratings2.8K
Sorting Visualizer
Watch six classic sorting algorithms race side by side.