phpformmailer
hCaptcha
Captcheck
CyberSiara
reCAPTCHA
visualCaptcha
UniqPin
Negative Captcha
MTcaptcha
hCaptcha
reCAPTCHA
DataDome
GeeTest CAPTCHA
AuthKong
PerimeterX Bot Defender
Solve Media
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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.
Captcheck - Open source reCAPTCHA alternative
reCAPTCHA - reCAPTCHA is a free security service that protects your websites from spam and abuse.
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.
DataDome - DataDome provides innovative technology and human expertise to block bad bots.
GeeTest CAPTCHA - GeeTest protects your websites, mobile Apps and APIs from bot threats.
