Matriphe Colorspam provides you a new easy and effective style of fighting spams coming to your WordPress site. The plugin fights spams in registration and login forms by showing color in a box and asking user to type the name of color. It includes main colors like red, green, blue, yellow, black, white, pink, orange, purple, grey and uses CSS coloring for generating colors. Spam Bots cannot read this color name.
The plugin is very easy to use and there are no complicated configuration settings to set like other captcha plugins. Simply install and activate it and you are ready to go.