Completely Automated Public Turing Test to Tell Computers and Humans Apart (CAPTCHA)

Asking users who are blind, visually impaired or dyslexic to identify textual characters in a distorted graphic is asking them to perform a task they are intrinsically least able to accomplish. 

People who are deaf, hard of hearing, or living with auditory processing disorder to identify and transcribe in writing the content of an audio CAPTCHA is asking them to perform a task they’re intrinsically least likely to accomplish.

It is presumed that all web users can read and transcribe English-based words and characters, making the test inaccessible to non-English speaking web users.

Design patterns expect multiple attempts from users, affecting those living with an anxiety disorder and a range of other cognitive and learning disabilities.

” CAPTCHAs fail to properly recognize users with disabilities as human, obstructing their participation in contemporary society. Such issues also extend to situational disabilities whereby a user may not be able to effectively view a traditional CAPTCHA on a mobile device due to the small screen size, or hear an audio-based CAPTCHA in a noisy environment.”

“It is important to acknowledge that using a CAPTCHA as a security solution is becoming increasingly ineffective.”

Understanding SC 1.1.1:Non-text Content (Level A) #

“Because some users with disabilities will still not be able to access sites that meet the minimum requirements, the Working Group provides recommendations for additional steps. Organizations motivated to conform to WCAG should be aware of the importance of this topic and should go as far beyond the minimum requirements of the guidelines as possible. Additional recommended steps include:

  • Providing more than two modalities of CAPTCHAs
  • Providing access to a human customer service representative who can bypass CAPTCHA
  • Not requiring CAPTCHAs for authorized users”

Google reCAPTCHA v3 –

Google reCAPTCHA v2 –


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