NASSCAD 4.7.0 is a 3D CAD app for the browser and Windows, with STEP import and export, and the page is candid about the limits.
Browser: Union, Subtract and Intersect run on Manifold WASM, and no companion install is needed for them.
Windows: The Electron app bundles MEDUSA, a native C++ engine for STEP import and export, large assemblies and per-face colours.
STEP: AP203, AP214 and AP242 are supported, but the page says imported STEP is treated as viewer data, not certified as closed, editable solids. The assembly tree also doesn't recover the original sketches or feature history.
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TL;DR of the article, generated automatically.
NASSCAD 4.7.0 is a 3D CAD app for the browser and Windows, with STEP import and export, and the page is candid about the limits.
Keep the original STEP, as the page says.