What is Domino Rally?

Domino Rally is a free browser-based domino run builder and toppling simulator. Draw tracks on a 3D floor, add props, branches and photo mosaics, then knock the whole chain reaction down with real physics. No download, no account, no signup.

Is Domino Rally free?

Yes, completely free with no hidden limits, no account, no watermarks, and no feature gates. Your builds stay on your device.

Drag on the floor to lay dominoes, press Play, then tap any domino to start the reaction. Press G to generate a complete run instantly. Everything runs in your browser and nothing is uploaded.

Does it collect my data?

No. Your builds, photos and replays never leave your device. There are no servers and no uploads, just basic anonymous page analytics.

Can I turn a photo into dominoes?

Yes. Open Add, choose Photo, and drop in any picture. Domino Rally converts it into a colored domino mosaic that topples in bands, processed locally in your browser.

Can I save or share my runs?

Your build autosaves on this device, and you can export it as a project file to back up or share. Capture saves a photo up to 8K, records a clip with sound as MP4 (WebM in Firefox), and builds a looping GIF, in 16:9, 9:16, 1:1 or the view you are looking at. Every run also records on its own.

How does Domino Rally compare to Domino Simulator on Steam?

Domino Simulator and Domino Effect: Build and Topple are downloads. Domino Rally runs instantly in your browser on desktop, tablet or phone, and adds photo mosaics, generated runs, vertical and square clips, looping GIFs and photos up to 8K, all free.

What do I need to run it?

Any modern browser with WebGL such as Chrome, Safari, Edge or Firefox on desktop, or a reasonably recent phone or tablet. Playback detail adjusts automatically to protect the frame rate on slower devices.

Domino Rally: Domino Run Builder & Toppling Simulator

Drag across the floor to line up dominoes

Add

Pick one to drop it on the floor.

Each prop carries its own domino route. Start on the floor to pass under, or on the raised route to cross.

RotationSet before placing

Turns a picture into a domino mosaic that falls in bands.

Choose or drop a photoStays in this browser.

DetailMore detail, more dominoesBalanced

ColorStored per domino

Load an image to estimate the mosaic size.

Capture

ShapeSame for all three

SizeShort edge

FilePNG is lossless, JPG is small

QualityJPG and WebP only92%

Frame rate60 is smoother, and twice the file

BitrateHigh keeps detail in fast cascades

Record every runStarts on the first push, stops when the dust settles Sound in the clipNeeds Sound on in Settings

View records the canvas as you see it, with no extra cost. Bigger sizes render a second copy each frame, which can slow a big run.

LengthRecorded from now, forward

Frame rateGIF is 256 colours, so keep it short

Press Play first, then Make GIF, to catch the cascade. Keep this tab in front while it records.

3840×2160 PNG

Settings

Domino sizeNew pieces only100% SpacingToo wide and they stop tippingBalanced Snap to connectionsAligns new pieces to existing ends Contact guidesRings showing safe, branching, blocked Counter while playingShows the running tally over the scene Scenery in generated runsArches and gantries that decorate but never topple

SoundImpacts as pieces fall Volume75%

Playback detailAuto protects frame rate

Autosave onYour build is restored on this device.

Help

Donateone-time via PayPal Supportmonthly on Patreon

Domino Rally is a domino run builder. Drag on the floor to lay track, press Play, then click a domino to start the reaction. Everything runs locally, nothing is uploaded, no account needed.

Building

Draw is the default tool: drag on the floor to lay dominoes, or start at the end of a run to extend it. Switch to Erase (or hold Alt) to rub pieces out. Drawing never deletes anything.

Generate

Generate or G builds a complete run from a single starter: loops, switchbacks, branches and a finale. Each press produces a different layout.

Playing

Press Play, then click a starter. Overlapping pieces are repaired automatically. Press Build to stand everything back up, or Play again to replay.

Camera

C switches between Auto and Manual. Right-drag orbits, shift + right-drag pans, scroll zooms.

Props

Every prop carries its own domino route. Start drawing on the surface you mean to continue on: the floor for an underpass, the raised route to cross the top.

Photos

Add → Photo converts an image into a colored domino mosaic that topples in bands.

When a run stops short

Fix the gap adds pieces exactly where the wave died and replays from the start. Keep it going carries on from that spot without changing the build.

Capture

Capture in the dock holds photos, video and GIF in one place. Pick a shape (16:9, 9:16, 1:1 or the view you are looking at) and a size, then save a photo up to 8K, record a clip with sound, or make a GIF. Record run arms the recorder and waits for Play, so your building never lands in the clip; Record now films straight away, including panning, and stops only when you say so. Every run also records on its own. No clip saves itself - it waits in Capture until you press Save or Discard.

Keyboard

Space play, E draw, X erase, G generate, K colors, P add, C camera, S photo, Shift+S capture panel, R record, Esc close.