Any tool to check for duplicate content on a page itself...

Hi,

Do you know of any tools to check if there's duplicate content on a particular page (e.g. homepage) itself?

I've duplicated several paragraphs on my homepage so they show differently to desktop/mobile users. But I guess in the html code both are visible.

The page is a long sales letter so it still has about 60% or more unique content I'd say, but not sure, which a tool to verify.

Thanks

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