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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.
MTcaptcha - Enterprise Captcha solutions
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...
CyberSiara - Leverage the complexity of the human eye to beat bots in a way no other CAPTCHA can. Keep your privacy. Secure your Site. Enhance your User Experience.
AuthKong - A reliable captcha service, offers advanced security to protect websites from spam and abuse while ensuring a user-friendly experience for legitimate visitors.