Create real-time 3D physics simulations without code
Give your designs weight, momentum, and life with Spline's real-time physics engine. Configure gravity, forces, and collisions visually to build simulations, toys, and product interactions that users can push, drag, and throw.
Get started — it's freePhysics-driven experiences make the most memorable interactive designs.
Creative teams use Spline's physics engine to build tactile 3D experiences that react naturally to every user interaction.
How physics simulations go from concept to interactive reality
Spline simplifies the entire pipeline for building physics simulations from the first bouncing cube to production-ready interactive scenes.
Ideate
Prototype your idea by dropping objects into a scene and enabling physics with a click. Experiment with gravity, mass, bounciness, and friction in real time, and remix community physics scenes to learn proven setups.
Design
Design the full interaction: combine rigid bodies, forces, and colliders with events like collisions, trigger areas, and drag-and-drop. Layer in materials, lighting, and sound actions so every impact and tumble feels satisfying.
Ship to Production
Ship your simulation as an interactive web embed or code export that runs smoothly across devices. Physics stays fully interactive in production, so visitors can play with your scene, not just watch it.
Remix Physics Simulations from the Community
Discover physics-ready templates to jumpstart your interactive, real-time simulation projects.
Frequently Asked Questions
Bring Real Physics to Your Designs
Build interactive simulations with gravity, collisions, and forces that users can play with in the browser.