Isoline is a browser-based studio for designing procedural 2D and 3D geometry using a visual node graph. Build shapes from primitives, transforms and smooth boolean operations, then render them as CPU contours, GPU GLSL, or full ray-marched scenes. Isoline uses SDFs and not polygons. Instead of editing vertices, you build geometry by composing mathematical operations. Exports include PNG, ShaderToy-compatible GLSL and binary STL for 3D printing. Free, open source, and no installation required.