| Captcha semplice | https://www.google.com/recaptcha/api2/demo |
| Captcha con strisce pedonali, semafori, biciclette | https://patrickhlauke.github.io/recaptcha |
| Captcha con altre immagini | https://nopecha.com/demo/hcaptcha#easy |
| Orientamento | https://www.arkoselabs.com/arkose-matchkey/ |
| lettere e numeri | https://captcha.com/demos/features/captcha-demo.aspx |