Atom Worldbox vs Reactix

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.

Reactix brings the chemistry lab to your pocket. Instead of just reading about reactions, perform them. Add chemicals step-by-step, observe real-time changes in color and temperature, and zoom into a molecular-level view to see exactly how atoms interact during a reaction. WHAT YOU CAN DO - Run guided experiments across categories like Neutralization, Single Displacement, Decomposition, and Combination - Follow clear step-by-step instructions for every experiment, from adding water to observing the final reaction - Switch to Microscopic Observation mode to see molecular behavior during the reaction, with plain-language explanations of what's happening and why - Get a full Lab Report after each experiment — including the balanced equation, reaction type, key observations, temperature change, and an accuracy score - Track every experiment you've completed in your Lab Journal, with dates and scores - Explore detailed chemical info cards — molar mass, pH, hazard level, and real-world uses for every substance - Use Quanta, the built-in calculator, for molarity, moles, dilutions, and unit conversions - no need for a separate app WHO IT'S FOR Whether you're a school student learning the basics, a college student who needs quick calculations, or just curious about how chemical reactions actually work - Reactix makes chemistry visual, hands-on, and easy to understand. WHY REACTIX Most learning apps only show text and diagrams. Reactix lets you perform experiments safely, at your own pace, and see the science happen - down to the molecular level - with no lab equipment or supervision required. Start experimenting. Start understanding chemistry the way it's meant to be learned.