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I'd say Website Auditor, it will show you broken links, HTTP status code errors, w3c warnings, duplicate content within the site, canonical URLs.
But, again, you have to know what to do with this info.
And, if I were you, I wouldn't strive to check some obscure SEO score for my site, because different SEO tools calculate this "score" very differently. And not all of them do, BTW.
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