[SEO] Penguin Tool by Barracuda Digital
 

This is a tool, which shows google / organic traffic from Google Analytics combined with major algorithmic updates of Google.com:

Panguin Tool | Technology by Barracuda Digital

Does it happen to show large traffic drops on the exact dates (lines indicated there) for some of your sites that may have been affected, or not necessarily?

I noticed large traffic drop in one of my sites, but it does not coincide with algorithm update lines (it was a month or so earlier than Penguin indicated there, lets say).

Asking just out of curiosity, maybe you can check.

If large traffic drop does not happen exactly on the algorithm update date, does it mean that a site was non-directly affected by one of the previous algorithm updates, most likely? How would you interpret that?

Thanks.

Sometimes these algorithms take time to roll out, especially if you are working on, say, .co.uk websites and if you are working in a foreign language website they sometimes don't happen at all.