Lay out the dominoes
Pick a tool and drag on the canvas: a line, a freehand curve, a spiral or a whole field. In the machine view, add balls, ramps, see-saws, pendulums and bells.
Domino Chain Reaction Simulator
Draw lines, curves, spirals and whole fields of dominoes on a table, or build a side-view machine with balls, ramps, see-saws, pendulums and bells. Push the first one, watch the wave in slow motion and save the run as a vertical, square or wide video with sound.
Open Domino Chain Reaction Simulator →How to make a domino chain reaction
Push and play
The first run you draw gets a push arrow. Press Start, slow it down to half or quarter speed, or step frame by frame.
Export the clip
Open Video, choose vertical, square or wide, a speed and the sound, then download the MP4 with every click in time.
Tips for a satisfying run
Spacing sets the speed
Dominoes about half their height apart topple briskly. Wider spacing is faster but leaves less room for error; much closer and the wave slows down.
Branch with a gap of one
Start two runs just past the end of a line, one either side. The last domino strikes both and the wave splits in two.
Fields spread in a wedge
In a staggered field each domino knocks over two in front, so a single push opens into a widening triangle.
Machines need a push
Balls on a slope roll by themselves; a ball or a domino on flat ground needs a push arrow. Use the Push tool to add or flip one.
Rows find the floor
In the machine view, a row stands on whatever is under the line you draw: the floor, a ramp, or a staircase of shelves.
Slow motion sells it
Export at half or quarter speed for close-ups. The camera follows the action and the clicks stay in sync.
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Domino chain reaction FAQ
What is a domino chain reaction simulator?
A sandbox where you set up dominoes and other parts on screen and watch them knock each other over with real physics. This one runs free in your browser, with nothing to install.
Can I make a domino spiral or a field?
Yes. The Spiral tool lays an inward spiral at the size you drag, and the Field tool fills a rectangle with staggered rows that fall in a spreading wedge. Lines and freehand curves work too.
How do I build a chain-reaction machine?
Switch to the machine view and combine domino rows, balls, ramps, see-saws, pendulums, bumpers, spinning paddles and a bell. Start from the Chain reaction scene and change it to learn how the parts connect.
Can I export a video for TikTok, Shorts or Reels?
Yes. Choose 9:16 (1080×1920), 1:1 or 16:9, 30 or 60 fps and normal or slow-motion speed, then download an MP4 with sound. Free, no sign-up and no watermark.
What sound does the video have?
Every domino hit is synthesized as a wooden click, or as a note of a rising and falling scale if you pick Notes. Balls, bumpers and bells have their own sounds. You can also export without sound.
Will the same layout always fall the same way?
Yes. The simulation uses a fixed time step and no randomness, so a layout replays identically, and the exported video matches what you watched.
How do I share or save a layout?
Copy link puts the whole scene in the address, so anyone who opens it gets the same layout. You can also save it as a JSON file and open it again later.
Does it work on phones and tablets?
Yes. Draw with one finger, pan and zoom with two, and use the tool bar above the canvas. Exports run on your device.
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