One canvas, one system, and every control that shapes it.
Three columns. The library of systems on the left, the canvas in the middle, the controls for whatever you have selected on the right. Nothing is modal. Move a knob and the drawing changes under your hand.
What gets stored is not a picture. It is four things: which generator, what the parameters are set to, the seed, and the palette. That is the whole design. It is also why a link to one is short enough to paste into a message and still comes back exactly right on someone else's machine.
Pick a system: Search, or filter by category. Every card on the left is drawn live by the system it represents, so what you see is what that system does.
Turn the knobs: Drag in any direction. Click anywhere on the arc. Use the arrow keys. Or type a number underneath. Hold Shift while dragging if you need finer steps.
Reroll the seed: The seed pins the randomness down. Change only the seed and you get a different draw of the same idea, which is usually what you want when the settings are right but the particular result is not.
Try a preset: Presets move the structure, not the colour. Every system has at least four, and they differ in shape.
A drag counts as one history entry, not one per pixel of travel. So undo steps back through the decisions you made, not through the mechanics of making them.
Do I need an account? No. Nothing is locked, there are no credits, and exports carry no watermark. Saved designs sit in your browser.
What is a seed, really? A number that fixes every random choice the system makes. It is the difference between "a field of dots" and one specific field of dots you can find your way back to.
I lost a design I liked. If you still have the link, you still have the design. Everything needed to rebuild it is encoded there. Failing that, check Saved.