A list of different CAPTCHA designs

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Summary

Exploring a range of CAPTCHA designs reveals a spectrum of verification methods, from highly inaccessible and bizarre image-based puzzles to more interactive solutions like reCaptcha's Street View integration or MotionCAPTCHA. A significant concern for developers is the W3C's finding that traditional picture CAPTCHAs are often inaccessible and easily broken, prompting the development of tools to bypass them. To address these challenges, W3C recommends alternative approaches such as logical puzzles, sound output, limited-use accounts, and robust spam filtering.

Here is a list of website CAPTCHA designs which demonstrate all kinds of weird verification methods. By looking at these designs, as a website designer, you should distinguish which design is accessible and which is not.

Is this human readable?



What characters are in the picture?



One more



We will be crazy if we see these





OMG,What's the answer?





IQ Test?







Are you a normal person?



You know how blind people read?



ASCII Picture



Are you an adult?



3D verification code



reCaptcha



It increase a new feature recently. It display the Google Street View address and names .



Facebook's face detection : Nice idea, huh?



Microsoft's ASIRRA



DISTCHA : Similar to iPhone/iPad's slider



MotionCAPTCHA : Use mouse to draw a picture



siteHelp's DragCapCha



jQuery s3Capcha plugin



Ajax Fancy Captcha


wCaptcha



Picatcha



yoCaptcha



W3C Recommendations

The article Inaccessibility of CAPTCHA on W3C says that traditional picture CAPTCHA has the problem of inaccessibility, they are also easily broken.

W3C also gives some possible solutions

  • Logical puzzles
  • Sound output
  • Limited-use accounts
  • Spam filtering

For more information you can check this page.

Original author : Source : http://coolshell.cn/articles/7917.html

WEBSITE DESIGN CAPTCHA

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