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!This plugin hasn’t been updated in over 2 years. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.

KeyCAPTCHA - Social WordPress CAPTCHA

Our captcha is the free unique anti-spam solution. This captcha does not require any text typing. Moreover, the captcha contains social features.

Free Variants of Using WordPress CAPTCHA - KeyCAPTCHA

  1. Anti-spam protection. Social advertising. Monetization through commercial ads.
  2. Anti-spam protection. Monetization through commercial ads.
  3. Anti-spam protection. Social advertising.
  4. Anti-spam protection without any ads.

Social Features:

You may support charity funds by enabling social advertising in our CAPTCHA. Also you can earn money by specifying social and commercial advertising shares in CAPTCHA on your website.

KeyCAPTCHA Unique Technologies

  • Instead of guessing symbols, our WordPress CAPTCHA offers visitors to complete an easy interactive task.
  • If CAPTCHA hasn't been solved correctly, page refreshing doesn't take place that allows the user not to fill in the form repeatedly. It occurs since there is an initial checkup of CAPTCHAs in our CAPTCHA servers before sending a filled-in form to the protected web server.
  • Our CAPTCHA also can be used even if your hosting provider blocks all outgoing connections.

Effective Anti-Spam Protection

  • The geo-cluster is used to operate our CAPTCHA service. Our geo-cluster includes the servers located in diverse European data centers. Some servers are in the special DDoS stable data centers in Switzerland to ensure trouble-free 24x7x365 mode service operation.
  • Our CAPTCHA blocks spammers using anonymizers or anonymous HTPP proxies to distribute a hand spam.
  • There is no info of correct CAPTCHA solution in the visitor's browser.
  • CAPTCHA verification is processed by the our CAPTCHA servers.
  • Data transferring between your web server, the visitor's browser and our CAPTCHA servers is protected by a digital signature.
  • 112 to 165 bit variable length password is used to generate a digital signature.
  • Our CAPTCHA is a code executable in the visitor's browser. It is not a static image as used in typical CAPTCHAs.
  • Having received our CAPTCHA, it's virtually impossible to transfer it to third parties in order to run any task what spammers also do bypassing typical CAPTCHAs.
  • Probability of guessing the answer by submitting a random solution is 1 to 30,000,000.
  • CAPTCHA-used images are transferred encryptedly.

Integration with WordPress

Our CAPTCHA protects the following forms:
  • Registration form
  • Comment form
  • Login form
  • Lost password form
  • Contact Form 7
Compatibility and Features:
  • Supports Trackbacks and Pingbacks
  • Our CAPTCHA is compatible with BuddyPress plugin
  • Our CAPTCHA supports two operating modes: Flash and HTML5. HTML5 CAPTCHA mode is used in most modern browsers, such as Mozilla FireFox, Google Chrome, Safari, and also used in iPhone and iPad. The Flash mode has been developed to be used in Internet Explorer and Opera. While loading, CAPTCHA identifies its operating mode depending on the visitor's browser.


To install our WordPress CAPTCHA you should follow instructions in Installation tab. Otherwise the CAPTCHA won't work correctly.

KeyCAPTCHA Affiliate Program

KeyCAPTCHA Affiliate Program allows publishers as well as any Internet user to collect incomes. For more information on The KeyCAPTCHA Affiliate Program, go to http://keycaptcha.wordpress.com/captcha-for-site-owners/affiliate-program/

Requires: 2.7 or higher
Compatible up to: 3.9.16
Last Updated: 3 years ago
Active Installs: 4,000+


3.5 out of 5 stars


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