Loopy

What Loopy actually is

Sketch circles for the things in a system and arrows for how they affect each other, marking every arrow as increasing or decreasing. Press play and Nicky Case's tool runs the whole model, so a scribbled diagram of rabbits and foxes starts oscillating on its own.

Why it is worth your time

Adding one reinforcing arrow to a stable model and watching it spiral out of control is systems thinking taught in roughly fifteen seconds.

Common questions

Is Loopy free?

Yes. Loopy is free and does not ask you to register or hand over an email address before you can use it.

How long does Loopy take?

One quick round, then you can leave. We file it under "A minute" — draw a system of feedback loops and press play.

Does Loopy work on a phone?

Loopy really wants a mouse and a wide window. It will load on a phone, but the experience is built for desktop.

What kind of site is Loopy?

We list it under Sandboxes & Simulators — small worlds that keep running without you. Adding one reinforcing arrow to a stable model and watching it spiral out of control is systems thinking taught in roughly fifteen seconds.