Invisible Captcha


Joshua Dechant

3rd Party (Free)

EE Version Support

  • ExpressionEngine 1.x


If an item is crossed out, it might be untested, not applicable or incompatible. Contact the developer to be sure.

  • Updater
  • Multi Site Manager
  • Stand Alone Entry Form
  • Low Variables
  • Content Elements
  • Better Workflow
  • Matrix
  • Grid
  • Webservice
  • Publisher


  • jQuery for the Control Panel

Add-On Type(s)



Invisible Captcha asks a simple math question. If JS is enabled, the question will answer itself and be hidden from view.

It asks a simple math question: the addition of 2 random single digit positive integers. If a user has javascript enabled, the question will answer itself and be hidden from view. SPAM bots are generally known to not be able to parse javascript. The javascript is also slightly obfuscated and randomized, so that if someone wants to write a SPAM bot that uses screen scraping to figure out the correct answer, they’ll have to work for it a bit.

Invisible Captcha Links

Hooks Used

If the add-on is an extension, and ties into ExpressionEngine's core files, it will use ExpressionEngine hooks. We are listing any hooks the add-on uses for developers to have an easier time locating other add-ons that they can reference for their own work.

  1. create_captcha_start

This entry was created November 6, 2008, 4:42 pm.
This entry was last updated November 30, 2009, 6:31 am.

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