Design particle effects in your browser and export one JSON file. Your game plays it with the same runtime the editor uses, so what you see is what ships. Works with PixiJS, Three.js and Phaser 4. The runtime is MIT and free.
Every one ships with the editor and opens as a starting point. All of them are free to use, no key needed. These are real frames from the same runtime your game ships.
@particlr/mcp is an MCP server for coding agents. An agent can build a
.prt effect, check it and see it without a browser or a GPU. It validates
with the same parser the runtime uses, runs the simulation in Node, renders frames to
PNG and fixes things by patching.
Open source, MIT.
{
"mcpServers": {
"particlr": {
"command": "npx",
"args": ["-y", "@particlr/mcp"]
}
}
}Effects made this way play back byte-for-byte in the runtime and open in the editor. It is the same document and the same simulation. The headless renderer is close to the GPU preview but not pixel-identical: it does not draw dissolve and the emitter does not move, so check those two in the editor.
The editor is free to use. One key unlocks the advanced modules. You pay once.
$10 one-time later $20
Early-bird launch price. It becomes $20 when the beta ends. Free lifetime updates.
Without a key you can still open, play and re-export effects that use premium features, so every preset works as a demo.
One person can buy the individual key. A team buys the studio licence: one key, paid once, for everyone at your company. Tick "purchasing as a business" at checkout so the key carries your company name. Questions? Email brac@brac.dev.
Already bought? Open the editor and choose Unlock premium to activate your key. It works on all your devices.