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VouchSafe is an easy, effective replacement for comment and registration CAPTCHAs that’s highly secure, and easier for your users to complete.
You can use VouchSafe to secure your comments and registration from spam. VouchSafe is easy to use, and very effective in stopping spammers. It’s the first Human Interactive Proof that use an adaptive AI to create challenges that only humans can solve. You can learn more about VouchSafe at the <a href="http://www.vouchsafe.com" rel="nofollow ugc">VouchSafe website</a>.
To solve a challenge, users either draw a line to join two objects that are related, or circle one object that doesn’t belong in a group of related objects.
For visually or motor-impaired users, VouchSafe offers audio-based type-in challenges. VouchSafe is compatible with most smart phones and tablet computers.
VouchSafe requires users to register their domain to get an API key to activate their plugin. Your keyset allows you to customize the way VouchSafe will appear on each domain you manage. VouchSafe also offers support for SSL.
Full installation instructions with screenshots can be found in our <a href="http://www.vouchsafe.com/user-guide-for-wordpress" rel="nofollow ugc">installation guide</a>.
To get an API key to activate VouchSafe on your domain, go to our <a href="http://console.vouchsafe.com" rel="nofollow ugc">registration page</a>.
If you run into trouble <a href="http://www.vouchsafe.com/contact" rel="nofollow ugc">contact us</a> or you can check the posts on our <a href="http://www.facebook.com/vouchsafe.me?sk=app_2373072738" rel="nofollow ugc">Facebook discussion page</a>.

VouchSafe CAPTCHA Replacement

VouchSafe is an easy, effective replacement for comment and registration CAPTCHAs that's highly secure, and easier for your users to complete.

Pippin Williamson

Modifies the Empty Spam action in WordPress to process the spam deletion in batches, allowing you to delete thousands or even hundreds of thousands of spam comments at once without killing your server.
Have you found a bug or have a suggestion or improvement you’d like to submit? This plugin is available on <a href="https://github.com/pippinsplugins/batch-comment-spam-deletion" rel="nofollow ugc">Github</a> and pull requests are welcome!

Batch Comment Spam Deletion

Modifies the Empty Spam action in WordPress to process the spam deletion in batches instead of all at once.

VouchSafe CAPTCHA Replacement vs Batch Comment Spam Deletion