NucaptchaThis site offers free and paid versions of captcha.
Free version - up to 25,000 items per month.
The paid one has additional security tools (which are not necessary for the usual website owner), for example, if the form is filled too quickly, P..
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AreyouahumanAre You A Human? The original captcha to your site.
Sometimes captcha are so uncomfortable, it's unclear what to enter, pay attention to the register or not, there is a space or not ... Periodically you have to break through to the site, and more often just leave and look for a more sane.Here the goal is simple - captcha should be unexpected for the robot and not understandable, but easy and obvious for the user.
As is clear from the example. In this case, it is suggested to drag 2 orange triangles to point C.
For me, it will be easier for Google.
Google reCAPTCHAYou can use Google Captcha for free for your mail form or where you need it.
Before Google did a good captcha, but now it has become generally super.
If before you had to enter the proposed text into the form, which was not just a random set of symbols, but similar to a word or a real word, then now there is NOT ANYTHING TO INTRODUCE.
Has come, I saw, I clicked and all!
How do they find out that this is a person? I do not think that we will understand until the end, and do not. The main thing is that it is convenient for the visitor and us.
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