You can look once before you create an account. The generator copy says the first run is a lighter preview, one per visitor, and it does not require sign-in. Lighter means fewer Gaussians than a full run. It is a preview, not a second hidden product.
One per visitor means the free look is not an endless gallery. When it has been used, the page tells you to sign in to continue with account credits. This article does not quote the size of any credit grant. Read the generator note for the current number so a blog cannot freeze an old one.
Sign in when you want the next generations kept in account history. The preview is there to answer whether the splat is the kind of file you wanted. It is not there to build a library.
Do not open many private windows to hunt for more free previews. The product states one per visitor. Treating the limit as a puzzle wastes the decision the preview was meant to support.
If the preview subject is wrong, fix the photo before you sign up and pay. A centered subject beats another account. If the preview subject is right and you want more runs, then the pricing page is the next honest step.
This page does not promise the preview matches a paid run point for point. The generator already says the preview is lighter. Judge the file type from it, not a final quality score.