Clickcha is a very unique & secure CAPTCHA that requires just one click instead of typing characters.
Note 1: If you have WordPress 2.7 or above you can simply go to ‘Plugins’ > ‘Add New’ in the WordPress admin and search for “clickcha” and install it from there.
Note 2: If your WordPress theme doesn't have the
comment_form hook (i.e. Clickcha won't show up with the comment form), enter the following code right before the closing
</form> tag in the
comments.php file of the theme.
<?php do_action('comment_form', $post->ID); ?>