Hi,

MonoX supports reCaptcha but it doesn't have a built-in module with reCaptcha, rather MonoX uses his own Captcha module. If you want to use reCaptcha rather then MonoX Captcha module you can do this by inheriting from MonoX Captcha module and by performing the following steps:

1. Inherit the mark-up from Captcha module
2. Inherit the code-behind from the Captcha module
3. in the PreRender you should hide the following element upCaptcha 
4. You should place the reCaptcha code outside the upCaptcha element 
5. You should check if Page.IsValid when you perform any kind of Postback to see if captcha validation is succeed 

Please take a look at the reCpatch ASP.NET implementation here.

Regards