If you are looking for a completely free, unrestricted experience and have a decent graphics card, open-source plugins are the way to go. These often connect SketchUp to a local installation of Automatic1111.
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Accessible via the Extension Warehouse inside SketchUp. 2. Veras by EvolveLAB If you are looking for a completely free,
Veras is a powerful AI engine that works as a floating window within SketchUp. It is widely considered the industry leader for architectural AI rendering. total privacy (runs locally)