accessibility - Are there any text-only CAPTCHA systems available? -

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for niche reasons find text-only captcha better traditional image/audio solutions. of reasons can think of off top of head:

  1. text-based browser support(lynx, links, etc)
  2. to provide write-capable public apis, prevent massive amount of spam
  3. for accessibility reasons (i've heard audio versions hard understand prevent voice-recognition software attacks)

are there text-only captcha systems available out there?

all of captchas i've seen don't use images or audio involve sort of cognition:

  • what day of week tomorrow?
  • who host of last week's snl?
  • what 2 + 3 plus four?

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