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Site Security

VouchSafe is an easy, effective replacement for CAPTCHAs that requires users to simply draw a line to join two objects that are related, or to circle an object that doesn't belong in a collection. VouchSafe is the only Human Interactive Proof that uses an adaptive AI to generate challenges and to learn from the selections that people make.

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VouchSafe is people-friendly, extremely secure, and works on most smart phones and tablet computers. An audio-based challenge is available for visually or motor-imapaired users.

The VouchSafe plugin is a simple installation that automatically protects your choice of contact forms, user registration, or both. The plugin has been updated to provide support for Joomla 1.5, 1.7 and 2.5.

Site operators can register for an optional api key at in order to activate vouchsafe on their domain. Your registration keyset allows you to customize the way the VouchSafe challenge appears on each of your domains.

You can simply and install and run the plugin without registering for an API key, in which case it will simply be displayed with the default settings and interface color.


Posted on 27 December 2011

I have the same issue as the previous poster. The installation & integration is very smooth, however the issue is that some characters cannot be entered in the email field. I was able to workaround the issue partially by using the CAPS option (SMTP is not case sensitive) but the issue could be a problem if imposed on registration / contact forms as it could stop the process entirely.

Owner's reply: I'm sorry for the late reply - for some reason I didn't get a notification of your review until today.

We never heard back from the person who posted the first review, but we managed to figure out what the issue was, and traced it to the latest build of Joomla 1.7: there was a class name in COM_CONTACTS that wouldn't play nice with our code. I apologize for missing that.

We made changes to our server-side code to address the issue. Since the update is server-side, there's no need to update your plugin - it should simple work. The change was effected on Jan 3rd, 2012.

I'd appreciate very much it if you could confirm that everything's working properly at your end. If you have any other problems, comments or ideas, please feel welcome to post them on our Facebook page (, or to contact us directly via our website (

Chris Ivey

I like the product and concept, unless I am doing something wrong, it prevents certain keys from being input in the Email Address and confirm email fields.

Owner's reply: Dear Mr. Big,

I certainly don't want you to have trouble with the plugin, though I'm not sure what you mean by keys in the email fields. Can you contact us at and describe what is happening in a little more detail? We'll do our best to determine what's happening and get a fix for you right away. If this is something that applies to all instances of the plugin, we'll post our solution here for other readers.

Chris Ivey,
ShareThink Ltd.


Christopher Ivey
Date added:
Nov 18 2014
GPLv2 or later
Free download
Uses updater:
Download Demo Support Documentation
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