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According to the marketing copy on the website, this Captcha system is both open source and perfect in just about every way.

I'm not capable of judging it myself (*) but look forward to people who are able to review and tell people like me whether it's really as good as it claims.

(*) Though I will note that the 18+9 example it gave me a) successfully tricked ChatGPT's image recognition into believing that 18 was the only number anywhere in the image and b) while it's a simple sum for me, there is a non-zero percent of humans who do have difficulty when it comes to even the simplest of sums.

Thanks for your feedback. Much appreciated. You make a valid point about 'there being a non-zero percentage of people who struggle with...'. We're considering showcasing simpler equations or offering users a choice of one out of five solutions, each presented visually as an image. Perhaps we might even use a combination of both methods. This approach should enhance usability since it allows for solving captchas solely via mouse or touch, and provides a helpful hint for users less confident in math. An AI would still have a hard time correlating all these aspectsg. What are your thoughts on this approach?