Google Algorithm Tool

Shows fluctuations in SERPs matched with algorithmic updates

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Kevin Chau
Kevin Chau@kchau · Director of BD, Divshot
Or there's MozCast from @Moz
Dan Leveille
Dan Leveille@danlev · Product Marketing, DeviantArt
@kchau @Moz In my opinion, this one is much more readable/understandable than Moz's, but I think I probably trust Moz's data just because of their reputation.