Gravity Sandbox

Unleash your creativity and explore the laws of physics with Gravity Sandbox, the ultimate offline 2D rigid-body physics simulator! Designed for students, educators, and anyone fascinated by mechanics, this app lets you create, manipulate, and observe physical shapes in a beautiful, highly responsive virtual laboratory.
No internet connection, no login credentials, and no subscriptions required—everything runs 100% offline right on your device.
★ DYNAMIC SIMULATION WORKSPACE
Place objects freely inside an expansive 2000x2000 coordinate grid. Seamlessly navigate your custom setups with smooth pan and zoom gestures. Test structural designs, build slopes, drop objects from massive heights, or simulate outer-space conditions with absolute control.
★ AN ARRAY OF PHYSICS OBJECTS
Select and spawn five distinct shape types:
• Balls: Animate with rolling rotation, angular momentum, and core indicators.
• Squares & Wedges: Slam flat surfaces and tumble realistically.
• Triangles: Create pointy obstacles, pivots, or wedges.
• Ramps: Angled static slopes designed for sliding tests and velocity builds.
• Walls: Thick solid boundaries to contain and block movement.
★ TOTAL PHYSICS CUSTOMIZATION
Control the environment and individual elements in real-time using precise sliders:
• Gravity: Tweak acceleration from 0 m/s² (zero-g space) up to 20 m/s² (heavy gravity).
• Bounce (Restitution): Adjust elasticity from no-bounce lead weights to hyper-elastic spheres.
• Friction: Scale surface resistance from frictionless ice to high-drag grip.
• Air Resistance: Control velocity damping for realistic atmospheric drag.
• Object Mass: Change mass density (0.1 kg to 10 kg) to watch how heavy and light objects interact.
★ INTERACTIVE GESTURE CONTROLS
Use intuitive multi-touch controls to direct the simulation:
• Drag & Throw: Reposition shapes with your finger and throw them to build instantaneous kinetic velocities.
• Tap Selection: Touch any object to access its specific properties panel.
• Long Press: Instantly rotate selected shapes by 45-degree increments.
• Double Tap: Reset an object’s velocity, angular spin, and angle to zero.
★ ADVANCED OFF-LINE SOLVER
Powering the sandbox is a custom 2D impulse-based rigid-body physics engine written from scratch in Dart. Featuring Separation Axis Theorem (SAT) collision checkers and sub-stepping loops, it delivers stable, ultra-smooth 60 FPS calculations of sliding, rolling, and impact bounces.
★ SLEEK MATERIAL 3 INTERFACE
• Experience a gorgeous dark/light theme designed with vibrant blue and purple gradients.
• View real-time diagnostics including exact FPS count, active object tallies, current gravity value, and elapsed simulation time.
• Customize your dashboard—toggle sound effects and the coordinate grid lines off and on.
★ PRIVACY GUARANTEED
Gravity Sandbox is completely offline. We do not gather, store, or transmit any user data. The app is free of advertisements, cloud trackers, and third-party SDKs, making it safe and secure for all age groups.
Explore gravity, test mechanics, and build your custom physics world in Gravity Sandbox today!