This feature helps to protect your forms against spamming by automatic submitters. It is only supported for Forms. Check the Captcha checkbox to select it.
Some less trusted users may see one or more challenge screens when attempting to submit a reCAPTCHA protected form. The challenge screens are grids of images and users are asked to choose the images matching a certain criteria. These are standard reCAPTCHA challenge screens and frevvo has no control over what is presented and when.
If you check this checkbox, a Save button will be displayed at the bottom of your form.