how to add captcha

vCita forms currently offers the following field types:
– Single line text area
– Multiple line text area
– Drop down list
– Phone
– First name & Last name
– Email
– Subject

Captcha option is not yet available, but we do plan to add it in the future. In addition, our contact forms and widgets include a technology that prevents spam sent by robots, and allow you to block specific contacts by marking them as spam.

Thanks. Where can’t they marked as spam? As we get a lot of spams through our contact form at https://www.lovesilence.com/contact/ So we are really looking for this important update to add captcha.