Describe a game, a sprite, a soundtrack or a voice. Janus builds it in seconds, and everything you make is yours to edit, export and ship.
From a one-line game idea to sprites, 3D, music, voice and trailers. Browser tools are free and unlimited; AI tools spend credits. Everything lands in one library and can be sent to any other tool.
Janus Studio runs on Janus Engine: a deterministic Rust core that holds the truth, and AI cognition that makes worlds react and remember, joined by one audited gateway. The AI does the plumbing. You keep authorship.
The ECS is canonical reality. Every AI proposal passes one audited gateway before it can touch your world.
Characters think off the frame loop, on the right model for each decision: local first, cloud when it counts.
Every character remembers what it knows, who told it and how it feels, stored in your game, not a context window.
A constrained narrative agent that paces tension and surfaces opportunities. It nudges; it never overrides.
Characters, art, voice, music and playable games, generated to your engine's data contracts and kept coherent.
Every authority-bearing AI decision is written to a signed, append-only log before it commits. No exceptions.
Rad Games builds every one of its games on Janus, with the same engine and the same studio tools you get. Two series, nine games, every genre we love.
Four games. One house. Zero hard feelings.
The Pack and the Clowder share one house and play every game in it. Warm, cute-but-grown-up, and bloodless by design: nobody gets hurt, they just get sent home for a nap.
Two Earths. One wound between them.
One Earth where magic won. One where technology won. Now they are bleeding into each other. Five games, five genres, five corners of the world, and one signature move: the Portal-Rush.
Ownership isn't a slogan. Every generation in Janus ships with the paperwork a publisher, a platform or a lawyer will ask for, and commercial use is included.
Prompts that lean on protected characters, brands or living artists are caught before a credit is spent, so what you make stays original.
Images carry the IPTC digitalSourceType marker that stores, platforms and the EU AI Act look for.
Every image gets a pHash, so an asset stays traceable after resizing, packing and recompression.
Model, prompt, settings, cost and time, kept outside the file so it survives your build pipeline.
Frames and atlases export cleanly to Bevy, Phaser and Godot.
{
"asset_id": "a3f9c2e17b04d6e8",
"tool": "sprite-forge",
"model": "Nano Banana 2",
"prompt": "fox ranger with a bow, idle, 32x32",
"prompt_lint": {
"verdict": "clean"
},
"iptc_digital_source_type": "trainedAlgorithmicMedia",
"phash": "c3e1f0b8a4d29e17",
"credits": 8,
"exports": ["bevy", "phaser", "godot"],
"commercial_use": true
}# Connect your coding agent to Janus Studio claude mcp add --transport http janus https://janusengine.com/api/mcp \ --header "Authorization: Bearer $JANUS_API_KEY"
curl https://janusengine.com/api/v1/tools/image.generate \ -H "Authorization: Bearer $JANUS_API_KEY" \ -H "Content-Type: application/json" \ -d '{"prompt":"pixel-art treasure chest","model":"nb2-lite"}'
Every Janus Studio AI tool is a REST call and an MCP tool. Point Claude Code, Cursor or any MCP client at Janus and your agent can make sprites, music and voice lines straight into your project.
No signup. 100 free credits. Everything you make is yours.