Science Through Play
At Theory Toys we build software toys for exploring science. Each toy on this site is a hands-on experiment you can manipulate in real-time—watch quantum particles interfere, navigate through curved spacetime, see evolution unfold, or explore the structure of the cosmos. No passive reading, no static diagrams. Just pure, visual, interactive understanding.
Why Interactive Toys?
The best way to understand deep concepts isn't through textbooks alone—it's through play, experimentation, and direct manipulation. These software toys let you change parameters, run scenarios, and see immediate feedback. Build intuition by exploring. Watch cause and effect unfold in real-time.
Built for Understanding
Every simulation implements the actual mathematical physics or biological models, rendered in real-time. To see with your own eyes how Bell inequalities get violated, how length contraction resolves the ladder paradox, how Hardy-Weinberg equilibrium works, or why the CMB has the temperature it does.
We do our best to make the toys scientifically accurate, but it's impossible for a small team to get every detail right. If you see something we can improve, please get in touch at team@theory.toys.
Relativity
Explore the strange and beautiful world of special relativity, where space and time intertwine, simultaneity is relative, and the speed of light is the ultimate speed limit.
Quantum
Dive into the counterintuitive world of quantum mechanics, where particles behave like waves, measurement changes reality, and entanglement creates spooky action at a distance.
Cosmology
Trace the evolution of the universe from the Big Bang to today, exploring dark energy, cosmic expansion, structure formation, and the cosmic microwave background.
Astronomy
Explore orbital mechanics, stellar evolution, exoplanet detection methods, and observational astronomy through hands-on simulations of real astrophysical phenomena.
Biology
Watch evolution unfold through population genetics, explore ecological dynamics, see pattern formation emerge, and understand the mathematical foundations of life.
Genetics
From Mendelian crosses to genome-wide association studies, explore inheritance patterns, genetic drift, linkage mapping, and modern genomic techniques.
Philosophy
Build formal proofs, update beliefs with Bayes' rule, explore moral dilemmas, discover voting paradoxes, and see game theory and decision theory in action.