Excellent plugin stopped spam

This plugin seems to be too good to be true. But it is true, it exists and it is too good. It’s fantastic!
It blocked comment spam even when the content is in the cache. pity that does not support WordPress Login and Registration.

I was suspicious when I installed it on my site, but now I’m going to install it on 4 other sites.

I’m a boring guy to give 5 stars to a plugin, but this one is deserving so far.