This plugin hasn’t been tested with the latest 3 major releases of WordPress. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.

HumanCaptcha by Outerbridge


Most captchas are based on the requirement to reproduce a number of randomly-generated characters (which are sometimes blurred, jiggled and/or on a fuzzy background). HumanCaptcha generates a simple question which the user must answer using logical thought. HumanCaptcha is much more accessible than standard captchas (which many people find difficult to read or understand). Visually impaired people are much more likely to be able to use HumanCaptcha than a character-based one.

** Captchas **

Most captchas are based on the requirement to reproduce a number of randomly-generated characters (which are sometimes blurred, jiggled and/or on a fuzzy background). HumanCaptcha generates a simple question which the user must answer using logical thought. HumanCaptcha is much more accessible than standard captchas, which many people find difficult to read or understand. Visually impaired people are more likely to be able to use HumanCaptcha than a character-based one.

CAPTCHAs are useful for improving security in a number of situations, for example:

  1. Reducing Comment Spam in Blogs
    Most bloggers will have come across programs that submit spam comments, often with the aim of improving the search engine ranking of a website. By using a CAPTCHA, only humans can enter comments on your blog, and people do not need to sign up before they enter a comment.

  2. Protecting Email Addresses From Scrapers
    Spammers crawl the web looking for e-mail addresses rendered in text. CAPTCHAs can hide your e-mail address from web scrapers, by requiring users to solve a CAPTCHA before revealing your e-mail.

  3. Deterring Viruses, Worms and Spam
    CAPTCHAs may reduce the likelihood of e-mailed viruses, worms and spam, by only accepting an e-mail if it has been established that there is a human behind the sending computer.


Many thanks to:
TH90 ( of MPW D&D for the Persian translation files (fa_IR). Language: Persian, Country: Iran.
Dayl ( in Санкт-Петербург for the Russian translation files. Language: Russian, Country: Russia.


  • screenshot-1.png shows how the question slots seamlessly into the comments section of the WordPress site.

  • screenshot-2.png shows the administration section of the Outerbridge HumanCaptcha plugin.


  1. Install automatically through the ‘Plugins’, ‘Add New’ menu in WordPress, or upload the ‘outerbridge-humancaptcha’ folder to the ‘/wp-content/plugins/’ directory.

  2. Activate the plugin through the ‘Plugins’ menu in WordPress. Look for the link under the Plugins menu to amend the questions and andswers.

  3. Test the plugin in by logging out and posting a comment.

  4. Updates are automatic. Click on “Upgrade Automatically” if prompted from the admin menu. If you ever have to manually upgrade, simply deactivate, uninstall, and repeat the installation steps with the new version.

அடிக்கடி கேட்கப்படும் கேள்விகள்

Where do I get help with this plugin?

Leave a comment in the support forum and we’ll do our best to support.


ஆகஸ்ட் 12, 2023
Une excellente et simple extension de captcha au plan de l’accessibilité pour les aveugles tant en visiteurs qu’en administrateur ! J’en étais vraiment ravi jusqu’à ce que récemment, je me suis aperçus d’une faille de sécurité majeure dans la page “santé du ste” de Wordpress : Une session PHP a été créée par un appel de fonction session_start(). Cela interfère avec l’API REST et les requêtes de boucle (loopback). La session devrait être fermée par session_write_close() avant d’effectuer toute requête HTTP. La désactivation de toutes extensions de mon site pour les réactiver une à une ont imparablement diagnostiqué Human Captcha comme responable de cette faiblesse.Je comprends fort bien la réponse du développeur joint par courriel,qui m’indique être trop occupé par des activités rémunératrices pour s’en occuper, sauf si j’accepte de financer ce développement. Moi, quand je suis trop occuper, ce n’est pas un financement qui pourra m’occuper moins !J”espère que les 400 utilisateurs de l’extension que nous sommes n’auront pas à en pâtir !
நவம்பர் 28, 2022
I have tried google recaptcha but somehow my site was still being spam until I change to this human captcha, no more spam user, comment….etc….all gone. Thank you very much for this great plugin and its author. PS: I used this plugin over 4 years. After a long time using and now I come back to review. )))
செப்டம்பர் 24, 2021
Extremely simple and effective plug-in to cut ALL spam comments. This is just what I wanted: simple questions in the language my content is to block bots from forms on my site. Had a bit of teething trouble when I took it up, the language has characters it didn’t support correctly in combination with numbers but in the end the developer resolved this very fast. Could do with a little more features but KISS.
மார்ச் 13, 2020
Three thumbs up for ease of installation, plus a another thumb up for creativity. I installed this plugin on three sites that cater to people who like to think, so being able to customize questions that are a little thought-provoking is a real treat. So far, everything seems to be working OK. David W. Blomstrom
டிசம்பர் 16, 2016
So I really wanted to like this plugin. It does what it’s supposed to do and does it well. I like the simple options to control where it appears as well as make my own captcha questions. However, The settings for this plugin appear under the Plugins menu item in the admin rather than the typical Settings menu where most would appear. This is extremely abnormal and easy to forget. Worse though, it made it completely unusable for me since I run a multisite network that hides the Plugins menu item in the admin areas. It makes it impossible to reach this plugins settings. So, can’t use it because of this unusual functionality.
செப்டம்பர் 3, 2016
Easy to install and set up. The is a better captcha for a low vision person, because they don’t have to try to interpret a fuzzy image with numbers or letters. Great captcha for people using screen readers.
Read all 16 reviews

பங்களிப்பாளர்கள் & உருவாக்குனர்கள்

“HumanCaptcha by Outerbridge” is open source software. The following people have contributed to this plugin.


“HumanCaptcha by Outerbridge” has been translated into 1 locale. Thank you to the translators for their contributions.

Translate “HumanCaptcha by Outerbridge” into your language.

Interested in development?

Browse the code, check out the SVN repository, or subscribe to the development log by RSS.



  • v4.0.0 (11 Jun 21) Fixed session issue, thanks to @tmuk. Working with WP5.7


  • v3.1 (16 Jan 20) Improved foreign character handling
  • v3.0 (05 Jan 18) Improved accessibility (thanks to Ondrej), moved admin menu to Settings, tidied admin page, added Settings link to Plugins page


  • v2.1 (28 Jan 15) General code tidy plus remove references to HCAC
  • v2.0 (30 Sep 14) Added Russian translation files


  • v1.9 (29 Aug 14) Tested and stable up to WP4.0
  • v1.8 (06 Aug 14) Updated collation and charset options
  • v1.7 (05 Aug 14) Updated registration form processing to use the registration_errors filter as suggested by bml13
  • 1.6 (30 Apr 14) Removed mysql_real_escape_string() as recommended for WP3.9
  • v1.5.4 (12 Dec 13) Tested and stable up to WP3.8 and updated author name
  • v1.5.3 (07 Oct 13) Added cross-reference to Human Contact and Captcha
  • v1.5.2 (16 Aug 13) Corrected one missed translation point
  • v1.5.1 (16 Aug 13) Added TH90 of MPW D&D’s Persian translation file
  • v1.5 (16 Aug 13) Made the plugin translation ready and tidied the code a bit
  • v1.4 (24 Jul 13) Fixed the “add new” option which disappeared if the user deleted all questions
  • v1.3 (23 Jul 13) Fixed UTF8 issue
  • v1.2.1 (05 Jan 2012) No changes. v1.2 didn’t commit properly.
  • v1.2 (05 Jan 2012) Updated obr_admin_menu function to check against ‘manage_options’ rather than ‘edit_plugins’.
  • v1.1 (03 Jan 2012) Tested and stable up to WP3.3
  • v1.0(30 Sep 2011) HumanCaptcha now added to registration and login forms as well as comments form. Toggles added to admin menu to allow users to decide where HumanCaptcha is applied.


  • 0.2 (30 Aug 2011) Fixed session_start issue
  • 0.1 (25 Aug 2011) Initial Release