Type of reCAPTCHA, There are four types of reCAPTCHA to choose from when creating a new site.
reCAPTCHA v2 (“I’m not a robot” Checkbox)
The “I’m not a robot” Checkbox requires the user to click a checkbox indicating the user is not a robot. This will either pass the user immediately (with No CAPTCHA) or challenge them to validate whether or not they are human. This is the simplest option to integrate with and only requires two lines of HTML to render the checkbox.
reCAPTCHA v2 (Invisible reCAPTCHA badge)
reCAPTCHA v2 (Android)
The reCAPTCHA Android library is part of the Google Play services SafetyNet APIs. This library provides native Android APIs that you can integrate directly into an app. You should set up Google Play services in your app and connect to the
GoogleApiClient before invoking the reCAPTCHA API. This will either pass the user through immediately (without a CAPTCHA prompt) or challenge them to validate whether they are human.
reCAPTCHA v1 – Shut down
reCAPTCHA v1 has been shut down since March 2018. Please use an option above.