To make a distinction between automated bots and real humans, Google engineers are working on an improved version of the reCAPTCHA system. The new system called “Invisible reCAPTCHA,” uses a computer algorithm and requires no user interaction at all.
It is still under development, but is open for sign-ups, and all webmasters are welcome to help Google test its upcoming technology.
Google has revolutionized CAPTCHA technologies 2 years ago by releasing the No CAPTCHA reCAPTCHA service where users need to click on just one checkbox instead of solving complex visual puzzles made up of words and numbers.
The service not just maintained the same high-level of spam detection but also helped reduce the time needed to fill in forms.