Worthless. If you try to use, it doesn't work but instead gives the disclaimer, "Copyscape was not able to check your post - you have no search credits remaining."
when i click copyscape check on post page, it shows "Copyscape was not able to check your post - you have no search credits remaining.", so i must pay this plugin if i want to use it. Not much like this. I thought it's free.
If you concerned about duplicate content and Google rankings then you need some type of plagiarism checking software. I found CopyScape to be highly recommended, inexpensive, easy to use and multiple capabilities. I had a little trouble with the API, but I realized I was capitalizing the first letter on my user name. (Don't capitalize the first letter of your user name.) Once I figured that out it works great! The WordPress detail page states CopyScape has not been tested with the latest version of WordPress(3.9.1), but I'm not having any problems.
Tried on several sites and with articles I copied from popular sites. Will not check nor use the API credits I bought.
CopyScape has a very tech but more important is its great team and all the nice and supportive people who work there.
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