The developer advertises SketchUp-like tools—push/pull, offset, tape measure, arrays and face snapping—without a subscription. The app runs natively on Mac and also in a browser.
It is not an obvious replacement for Plasticity, but might be quicker for basic shapes and teaching someone how to build a printable part.
What to do: Try one box-and-cut model and compare its speed with your normal Plasticity workflow.
