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Draw circles and arrows, press play, and your scribble runs as a working feedback-loop simulation.
Opens in a new tab. We do not control this site and it may have changed since we catalogued it.
Loopy sits in Science Toys under Learn, filed as coffee break.
About this category: Simulations you can meddle with: orbits, evolution, chemistry, cellular automata. Understanding through interference rather than through reading.
Yes. Loopy is free to use and needs no account.
No. You can use Loopy without signing up for anything.
Not well. We file Loopy as desktop only, so open it on a laptop or desktop computer.
Yes, we file it as safe for work. It also works muted.
We file it as "Coffee break": Five to fifteen minutes of proper attention.
Search any molecule and spin its three-dimensional structure, with spectra and crystal data alongside it.
Colorado's library of physics, chemistry and maths simulations, used in classrooms everywhere and free to meddle with.
Write a Turing machine in a few lines and watch the tape head shuffle back and forth carrying it out.
Thousands of interactive maths and science notebooks contributed over two decades, each one a single slider-driven idea.
Browser sprite editor built around palette discipline, with the specific constraints pixel artists keep asking for.
A convincing macOS desktop rebuilt in Svelte, dock animations included, running entirely inside the browser.
One button, one progress bar, and the firm assurance that everything is now OK, which beats the alternative.
The maker movement's own magazine: projects, tool reviews and the long-running argument about what counts as making something.
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