Free interactive science lab
Veylora turns textbook concepts into hands-on simulations. Change the variables, watch what happens, read why it happens, and test what you learned — free, in your browser.
Featured simulations
Each simulator is a complete lesson: an interactive model, clear instructions, the science behind it, and a quiz to check your understanding.
Live simulator
Adjust solute concentrations inside and outside a cell and watch water move across the membrane until the cell swells, shrinks or bursts.
Change launch angle, speed and gravity and predict where the projectile will land.
Move the Moon around the Earth and see which phase appears from the ground.
Stimulate a neuron and watch an action potential travel down the axon.
Change greenhouse gas levels in a simplified climate model and observe the temperature response.
Change pH and watch indicators, ion concentrations and neutralization respond.
Cut into a 3D Earth and compare the temperature, density and state of each layer.
Change the environment and watch traits in a population shift across generations.
Set mass, distance and speed and watch orbits become circles, ellipses or escape paths.
Adjust length, mass and starting angle and measure the period of oscillation.
Science branches
From cells to stars, every branch has at least five simulators, each built around a different way of interacting with the science.
How living things work, from molecules to populations.
Atoms, bonds and the reactions that rearrange them.
The structure and function of the human body.
Planets, stars and the gravity that shapes the universe.
The diversity, behaviour and survival of animals.
How plants are built, grow, reproduce and defend themselves.
Forces, motion, fluids, waves, light and electricity.
The forces that build mountains, shake the ground and move water and air.
How organisms interact with each other and the planet.
The language scientists use to describe, model and predict the world.
How it works
Research on science learning consistently finds that students understand concepts more deeply when they actively manipulate them. Every page follows the same four-step loop.
Pick a branch of science and open a simulator. Every model is built around one clear scientific idea.
Change the variables yourself. Drag, click, adjust sliders and run the model again to compare results.
Read the explanation beside the model: the principles, key terms, formulas and real-world uses.
Finish with a quiz that gives instant feedback and explains every answer, then try again.
Built for
Recommended learning paths
Topics that build on each other. Live simulators are linked; the rest are on the way.
Knowledge check
Four questions from across the sciences. Pick an answer to see instant feedback.
0 of 4 answered
Answer: B. It swells and may burst because water enters the cell
Pure water is hypotonic to the cell’s interior. Water moves by osmosis toward the higher solute concentration — into the cell — so the cell swells and can burst (hemolysis).
Answer: C. Proton
The number of protons (the atomic number) defines the element. Changing neutrons gives a different isotope; changing electrons gives an ion.
Answer: B. Increases by about 41%
For small swings the period is T = 2π√(L/g). Doubling L multiplies T by √2 ≈ 1.41, an increase of about 41%. The mass of the bob does not matter.
Answer: C. We see different amounts of the Moon’s sunlit half as it orbits Earth
Half of the Moon is always lit by the Sun. As the Moon orbits Earth, we view that lit half from changing angles. Earth’s shadow only matters during a lunar eclipse.
Start with osmosis: one cell, one membrane, and a lot of moving water.