Captcha

ok try this plugins on your contact form

https://www.ads-software.com/plugins/contact-form-7/

https://www.ads-software.com/plugins/contact-form-7-recaptcha-extension/

Hi,

OnePirate is a child theme of Zerif Lite theme, which comes with a contact form included (and Pirate Forms plugin).
This way you can use the recaptcha provided in Appearance -> Customize -> Contact us section. You need to enter the site key and secret key.

Best regards,
Rodica