In search of effective spam protection, I came across an interesting project, which I will try to talk about in this review.

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Operating principle
Instead of looking at the porridge of letters and numbers, the developers of NotCaptcha offer to put the pictures in a vertical position by moving the sliders.
Efficiency
The project is young, not yet common. I put it on the corporate blog for verification, it’s too early to judge the results, but my colleagues liked it. Originally installed 33 images, easy to read. But in which case you can work and add your own.
Each of the three sliders has 8 turn options, with the result that we have 512 answer choices, of which only 1 is correct. A significant disadvantage is that the problem with drawing layers in IE6, which is installed by default on all of our work computers, will have to be updated.
Links
Developer siteTry NotCaptchaWordPress PluginDownload the script for self-installation