Interactive tools that make the hard parts of the syllabus easier to see and try. They are free, need no login, and work offline after your first visit.
Animated heart, lungs, digestion, kidney, eye and reflex arc. Step through how each organ works, click parts and test yourself.
Explore animal and plant cell organelles, follow how a cell makes a protein, and step through mitosis and meiosis with a slider.
Set the parents and see every possible child in a Punnett square. One-gene and two-gene crosses, ABO blood groups, sex-linked conditions, random families and a quiz.
Watch electrons transfer in ionic bonds and share in covalent bonds, see Lewis structures and rotate 3D molecular shapes.
Click any of the 118 elements for its mass, electron arrangement, configuration and animated atom model. Explore groups, periods and trends, and play Find the element.
Balance 70 chemical equations from easy to hard with a live atom counter, a balance scale and hints, or type any equation and have it balanced.
Build circuits from batteries, resistors, bulbs, switches and meters, watch the current flow, and check Ohm's law with series and parallel examples.
Fire projectiles with adjustable speed, angle, height and gravity, watch position, velocity and acceleration graphs link together, and test yourself.
Search physics, chemistry, maths and biology formulas by chapter, solve for any quantity with unit conversion, and follow worked examples.
Plot equations, change coefficients with sliders, find intercepts and intersections, and explore coordinate geometry.
Drag points to explore triangle and circle theorems, follow step-by-step compass constructions, and build and measure your own constructions.
Flashcards with spaced repetition, ready-made science and maths decks, your own decks, and a Pomodoro study timer with streaks.
More tools are added regularly. Tell us what would help you on the contact page.