Show HN: A self-running space economy SIM in Rust and Bevy

1 sources1 storiesFirst seen 7/21/2026Score22Mixed Progress

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kalcode

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I built this with Claude cause I always wanted to tinker with a simulation economoy and I love space themes.A space-economy sim where nothing is scripted.

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Some chase the best trade route, take a delivery contract, refuel, retrofit at a shipyard, or dock so the crew can rest before morale tanks.Markets price everything off supply with shortage-urgency multipliers, factions tax and subsidize, populations migrate when they're unhappy, and stations that go broke get abandoned and rot.It started as an Elixir/Phoenix prototype, but the BEAM scheduler struggled on Windows gaming PCs, so I had Claude rewrite the engine in Rust.The sim core is pure, synchronous, IO-free (its own hecs ECS), and the Bevy client embeds it directly as a library, sim and renderer share one world with zero marshalling.

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Ship AI is a GOAP planner over a world state; ships replan mid-flight when a better option appears.

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~485 agents today at p50 ~10-20ms/tick,...

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