Hi there,
You’re able to download the Recaptcha module(https://marketplace.mendix.com/link/component/115762) and import it into a Mendix 9 app by right-clicking in the App Explorer:
You’ll get errors about the layout, which can be resolved by changing the layout in the page properties:
You’ll then have to add your own site key to have the widget functioning in your app:
Hope this helps,
Liam