Accessible Text CAPTCHA Logic Questions
A CAPTCHA is a test to tell humans and robots apart. You've probably used one before: identifying a string of letters from an image to show that you are human, rather than an automated "bot". This site provides a web service to generate text-based CAPTCHAs, based on simple logic questions.
Which of leg, toe or finger is above the waist?
Twenty one, thirty nine, five, 15 and twelve: the 2nd number is?
What is forty seven thousand and thirty one as a number?
Image CAPTCHAs are inaccessible to visually impaired users, and depending on the level of letter distortion, sometimes quite difficult for fully able ones! An alternative audio test is often provided to address accessibility concerns, but this whole approach remains difficult to implement, awkward to style, and remains susceptible to automatic character recognition software.
A normal image based CAPTCHA. The user would be asked to identify the letters in the image.
This site provides a simple web service to generate text-based CAPTCHAs. These tell humans and robots apart by asking a simple logic question. These questions are aimed at a child's age of 7, so can be solved easily by all but the most cognitively impaired users. As they involve human logic, such questions cannot be solved by a robot.
Want to use such CAPTCHAs in your site? If you're not yet convinced that you need text CAPTCHAs, read why they are useful. Peruse some examples of the logic questions that are generated by this site. Find out how our service works, and sign up for your own account!