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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.
UniqPin - UniqPin is a free for non-commercial use service which destiny improve ability of interfaces detect...
GeeTest CAPTCHA - GeeTest protects your websites, mobile Apps and APIs from bot threats.
mosparo - the modern spam protection
MTcaptcha - Enterprise Captcha solutions
Solve Media - Solve Media's cost per engagement platform offers advertisers branded CAPTCHA and skippable Pre-Roll while providing publishers with enhanced security and a new revenue solution.