Welcome to OpenSeSim, the Stock Market Simulator

OpenSeSim lets you create trading bots, each following a strategy you choose, and watch them compete against each other in a dynamic stock market. Prices aren’t based on historical data — instead, the bots themselves set prices through supply and demand, creating a truly living market

With OpenSeSim, you can effortlessly pit 100,000 bots—or even more, if you like—against each other (even if it doesn’t always make practical sense!). On an older PC, OpenSeSim can still handle 100,000 to 200,000 trades per second, and on newer machines, it can do even more. Watch as your bots create a fast-paced, ever-changing market that’s entirely driven by their own actions.