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The first launch of Spinward.

Spinward page

Spinward

Launching today

Design an O'Neill cylinder colony, then walk through it

Hunted by IlyasHunter
Visit playspinward.com (opens in a new tab)

Spinward is a browser tool for designing O'Neill cylinder space colonies. Pick the cylinder's size and star, paint streets with brushes (grid, radial, hex, old town and more), fill the blocks with buildings, parks, landmarks, rivers and farms, then walk, fly a drone or VTOL, or ride transit through your city. Twelve preset colonies are there to visit, plus a torus mode. Built on three.js and WebGL 2; work is saved in your browser. Building needs a desktop. Free, no sign-up required.

Meet the team

Hunted by Ilyas. The makers are not on 25launches yet.

H (Hunter)
  • Spinward screenshot 1
  • Spinward screenshot 2
  • Spinward screenshot 3
  • Spinward screenshot 4

Discussion 1

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  • IlyasHunter Pinned

    O'Neill cylinders mostly live in 1970s paintings and slow offline renders. Spinward lets you lay out the streets of one yourself and fly through the result in a browser tab. Max Williamson's O'Neill cylinder thread passed 4.7 million views on X in October; that clip was polished with AI image and video models, while Spinward is the real-time version you can actually play with.