Simulate Baseball Games
Simulate baseball games with full rosters, lineups, starting pitchers, bullpens, stadiums, and Baseball Sim Engine ratings. No ads. Free and open source forever.
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How Baseball Sim Engine Uses ChatGPT to Help Create More Accurate Baseball EnvironmentsHow Baseball Sim Engine uses constrained model proposals and independent simulation verification to help create more accurate baseball environments.
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How Baseball Sim Engine Simulates Every PitchHow Baseball Sim Engine uses MLB-derived statistical distributions, player ratings, and pitch-by-pitch calculations to simulate baseball games.
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How Shareable Game Links WorkHow Baseball Sim Engine uses deterministic simulations and information in the URL to recreate the same game for anyone who opens the link.
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How Baseball Sim Engine Player Ratings WorkA reference for how Baseball Sim Engine builds player ratings from career performance, recent appearances, and league-relative statistics.
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Shareable games and better player pagesGames are easier to share, box scores work from direct links, and player pages picked up better team styling.
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Scheduled Games and Shareable Sim LinksAdded scheduled browser games, shareable game links, and separate player data.
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Baseball Sim Engine is LiveBaseball Sim Engine is now live, with MLB simulations, player pages, historical games, and a growing set of site improvements.
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Welcome to Baseball Sim EngineIntroducing Baseball Sim Engine, an open-source baseball simulation engine built to model the game from the pitch up.
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⚾Pitch-by-pitch baseballEvery game develops from pitches, swings, contact, batted balls, fielding, baserunning, substitutions, and scoring.
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📊Built from MLB dataPlayer ratings, league environments, stadium effects, rosters, and game inputs are built from historical and current MLB data.
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🎲Deterministic simulationsThe same simulation inputs and random sequence can reproduce the same game.
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🛠️Open sourceBaseball Sim Engine and its MLB data tools are open source, MIT licensed, and written in TypeScript.
Baseball Sim Engine is an independent, unofficial baseball simulation project. It is not affiliated with or endorsed by Major League Baseball or any MLB team.
MLB, team names, logos, trademarks, and other league or team intellectual property belong to their respective owners.
Baseball Sim Engine is free to use, contains no ads, and is open source under the MIT License. There is no paid access or advertising; optional support helps fund continued development.
❤️ Support the Project