Atom Worldbox

Build molecules atom by atom, spark real chemical reactions, and split atoms in your pocket. A chemistry & nuclear physics sandbox, now with heat and temperature.

The entire periodic table is yours to play with. Drop atoms onto the screen, watch them bond into real molecules, and trigger genuine chemical reactions all driven by real science, not scripted animations. Atom Worldbox is an open-ended chemistry and physics sandbox. There are no levels, no goals, and no rules just a living world of atoms governed by the same forces that shape the real universe. Bring two elements together and see whether they bond. Build a known molecule and the app recognizes it instantly. Push reactive elements together and watch reactions ignite, transform, and settle on their own. WHAT YOU CAN DO

• Experiment with every element on the periodic table

• Watch atoms form covalent, ionic, and metallic bonds based on real chemistry

• Build molecules and see them automatically identified

• Trigger authentic chemical reactions and watch them unfold naturally

• Turn on Thermal Mode: heat and cool your world — condense gases into droplets, boil them, or fuse hydrogen at star-core temperatures

• Explore radioactivity, isotopes, and natural decay

• Set off chain reactions and watch them cascade across your world

• Zoom, pan, and arrange everything with simple, intuitive touch controls REAL SCIENCE, NOT SPECIAL EFFECTS

Every bond and reaction is calculated from real chemical and physical principles. Atoms attract and repel, electrons transfer, and molecules come together exactly the way they would in nature. It's a living simulation you can build, break, and rebuild as many times as you like. GREAT FOR

• Curious minds who love to experiment and explore

• Students discovering chemistry and physics

• Teachers looking for an interactive way to show bonding and reactions

• Anyone who loves satisfying, science-driven simulations Works fully offline. No account required, no clutter—just open it and start building. Atom Worldbox is free to explore. Upgrade to Pro to unlock the complete sandbox experience.