“No-CAPTCHA” reCAPTCHA
This stuff kind of seems like an overkill to me.I think asking really simple questions that only a human could understand seems to get the job done most of the time.Perhaps something like: "What is the opposite of bad?" or "How many planet Earths are there?"I've used things like this for a handful of projects and have never had any problems: https://github.com/kiskolabs/humanizer