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hCaptcha - Do you use a captcha to keep out bots? hCaptcha is a drop-in replacement for reCAPTCHA that earns website owners money and helps companies get their data labeled.
reCAPTCHA - reCAPTCHA is a free security service that protects your websites from spam and abuse.
GeeTest CAPTCHA - GeeTest protects your websites, mobile Apps and APIs from bot threats.
UniqPin - UniqPin is a free for non-commercial use service which destiny improve ability of interfaces detect...
DataDome - DataDome provides innovative technology and human expertise to block bad bots.
CleanTalk - Spam protection for WordPress, Joomla, Drupal, and any other websites