What it does
The free sample is a recorded run, with Jev and Claude rabbits and rule-based wolves. Live simulations need an account and provider keys; this is not a validated model of wildlife.
Playable demos & bots
Jevolution
Jev controls rabbits and wolves in a pixel-art habitat where food, weather and inherited traits shape survival.
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How you can use it
If you're building a game with AI players, use the free recorded sample to study their moves. Follow an animal, pause or rewind, and inspect the recorded choices. For your own comparisons, keep the starting world and rules the same, and repeat the test.
Live Jevolution runs need an account and an access key that connects it to your chosen AI service. Those runs cost money. You can change the environment and timing settings. Use it to explore game behavior, not to predict real wildlife.