RunTheSimLoading library
Cards render from data/simulations.json.
Run the simulation.See what emerges.
2 sims live
3 in concept
runs in browser
common questions
Good questions.
What is RunTheSim?
A growing collection of playable browser simulations. Each one runs a handful of simple rules and lets you watch the shape those rules make. No curriculum, no quiz at the end, no lecture in the middle. Press play, tweak a slider, see what changes, ask why. That's the whole loop.
Who is this for?
Anyone with a curious streak who likes to poke at things. The kid who took toys apart to see how they worked and never really stopped. Students who learn better by pressing play than by reading. Teachers who'd rather show a working demo than a static diagram. Anyone who watches a science clip online and wonders what would happen if they could change one rule. No technical background needed; every simulation teaches itself in about thirty seconds of watching.
Is it free to play?
Yes. Everything live right now is free to play, with no account needed and no paywall. As the library grows, a few simulations might eventually put deeper controls or an offline presentation mode behind a free login, but the playable core of every simulation stays public. The site is not going to turn into a demo for something else.
Who is behind this?
Solo project, built in St. Gallen, Switzerland. I'm Esteban. The reasoning behind each simulation, the people it's for, and what's coming next all live on the about page. If a specific sim makes you curious about the angle it picked, that's where to find the thinking.
How often do new simulations drop?
Roughly one a week when I'm on pace. The newsletter right below sends the next simulation the moment it goes live: one email, one link, no roundup. If you'd rather see the messy in-between (half-working prototypes, the calls being made, the ones that didn't work out) follow the work in progress on the social channels.
Can I use these in a class or a video?
Yes. Embed one in a blog post, screen-record it for a lecture, link it from a syllabus. A credit to RunTheSim is appreciated but not enforced. For anything more formal, like an offline bundle for a classroom without internet, a licence for a whole school, or an embed feed that pulls live updates, write to hello@runthesim.app and we'll figure out what fits.