Not really.
Nobody tells you this, but there is a true, open-source(ish) hero: Vertex Tools (by ThomThom, ironically the same guy who made SubD). It isn't exactly SubD, but it handles subdivision smoothing reasonably well. It’s free, it's legal, and it runs on modern SketchUp. It lacks the instant "smooth toggle" of SubD, but for zero dollars, it gets you 80% of the way.
And you want it for .
For the uninitiated, "SubD" (Subdivision Surface) is magic. You start with a blocky, low-poly cage, press a button, and the software turns it into a buttery-smooth, high-resolution mesh. It’s how the pros make organic shapes without crying.
So why search for free? Maybe you’re a student, a hobbyist, or just want to see if SubD will change your life before you hand over your credit card. If you type that search into Google, here is what you will actually find: subd sketchup plugin free download
Many "free" downloads are actually trial versions of Artisan or the original SubD from 2015. They work beautifully for 30 days. Then, they turn into digital pumpkins. If you just need to model one helmet for a 3D print this weekend, this is your goldmine. But beware: many of these links point to SketchUp 8 or 2016—good luck installing them on SketchUp 2024.
Enter the plugin.
Your geometry will be smooth, and your antivirus will remain quiet.