Tough on botsEasy on humans

reCAPTCHA

Roughly 200 million captchas Are typed everyday

On an average 10s of humanTime is wasted per captcha

In this way approximately2000 million seconds get wasted everyday

LUIS VON AHN

• reCAPTCHA is a free service to protect your website from spamand abuse. reCAPTCHA uses an advanced risk analysis engineand adaptive CAPTCHAs to keep automated software fromengaging in abusive activities on your site.

• It does this while letting your valid users pass through withease.

• A CAPTCHA is a Completely Automated Public Turing test to tellComputers and Human Apart.

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OCROptical Character Recognition

For the visually impaired, reCAPTCHA provides an audio CAPTCHA option

MASSIVE SCALE ONLINE COLLABORATION