SkinPreview ok?

I know MKLoL isn't legal because of the jungler timer thing. My question is: is SkinPreview legal? It's only feature is to change skins locally. To avoid creating another topic, I want to ask something for a friend of mine. He got a 1-day suspension for using MKLoL. Will he be able to use Hextech crafting? I heard only "toxic" players will be left out.
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