Boids SimulatorThree rules, endless motion.

The classic flocking algorithm with every parameter on a slider.
Scare the boids, lead them, draw obstacles and export a video of the result.

Up to 3,000 boidsLive slidersSeeded replays

No sign-up No watermark Nothing to install

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Everything runs on your device.

THREE SIMPLE STEPS

How to use the Boids simulator

Tune the rules

Move the separation, alignment, cohesion, vision and speed sliders and see the flock change at once.

Add a challenge

Draw walls, turn on wind or the predator, or chase the boids with your pointer.

Record it

Make an MP4 clip replayed from the seed, or save a PNG.

WaveSpeed AI

Turn your flock into something bigger

Make images, animations and short videos from a prompt with WaveSpeed AI.

Start creating Explore 1,000+ AI Models

1,000+ AI models
Image, video and 3D
Pay as you go

$1 in free credits for eligible new accounts. No card needed. Generators have separate account and credit requirements. The flocking simulator is free.

Boids simulator FAQ

How does the boids algorithm work?

Each boid looks at nearby neighbours and steers to avoid crowding them (separation), to match their heading (alignment) and towards their centre (cohesion). The flock emerges from these local rules.

How is it so fast with 3,000 boids?

Boids are sorted into a spatial grid, so each one only checks the cells around it, and each pays attention to a limited number of neighbours, like real starlings.

Is it deterministic?

Yes. Runs are seeded with a fixed time step, so the same seed and settings give the same flight, which is how videos are rendered.

Is it free?

Yes. Free, no sign-up and no watermark, in your browser.

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