| AdCaptcher | AdCaptcher enables you to build and monetize custom captchas. |  | A new monetization method for your websites! Earn revenue by
serving smart ads in your captcha. | | Yes via CSS | No | | | | | | Yes | | | adcaptcher.com | | Likes 0 |
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| Ads Captcha | ADSCAPTCHA™ offers complete multi-language CAPTCHA solutions, from
free security-only CAPTCHAs, to premium CAPTCHAs featuring images
and video. |  | ADSCAPTCHA’s™ innovative Pay Per Type™ platform creates profits
from CAPTCHA technology. Instead of paying for CAPTCHAs, website
owners and developers can make money from every ADSCAPTCHA™ that is
typed in full. | Yes | | Yes | | Yes | | | | Yes | | | adscaptcha.com | | Likes 0 |
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| Adyoulike | Adyoulike enables a new way of making money using Captchas. Their
technology allows you to change the traditional Captcha, difficult
to read by an advertising Captcha, nice, easy to read and
remunerative. |  | The Captcha is served as an Ad, so you can get money while securing
your forms. | Yes English, French | No | No | | | | | | Yes | | | adyoulike.com | | Likes 1 |
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| are you a human | It is an alternative to CAPTCHA by using games : humans play but
not bots... |  | Fun way to check that the visitor is an human : he plays a game | No | No | No | PHP, Perl, Ruby, Python, .Net, Java | Yes | | Quicken Loans | | | | | areyouahuman.com | | Likes 0 |
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| Captch Me | Captch Me is an advertising captcha network. |  | Wide range of formats available for the ads : banner, video,
interactive (html5 or flash games). All devices compatibility.
Also, check-out our new "slider" ad format ! | Yes French, English, Spanish available, and many more coming soon ! | Yes 2 themes and custom | No | PHP, JSP, WordPress, phpBB, Joomla, Drupal + others on demand ! | Yes | Yes | | | | | | captchme.com | | Likes 2 |
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| Captchas.net | Captchas.net servers provides CAPTCHA images and audio files you
can use in html-forms to prevent robots from filling it. |  | | Yes Audio pronunciation: English, German, Italian, French, Dutch | Yes Size, color custom design for audio or to refresh the captcha | Yes | PHP, ASP, Perl, Python, JSP, Ruby | | Yes | | | Yes | 120 euros per year to remove captchas.net logo | | captchas.net | | Likes 0 |
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| NuCaptcha | NuCaptcha provides the only intelligent captcha product on the
market today |  | Behavioral Analysis System that adjusts security on the fly-
brandable, SLA, advertising, fully customizable. | Yes Fully Localizable | Yes Skinless version available to fully customize. | Yes | .Net, PHP, Java, various plugins | Yes | Yes | Yes, various, ISP's, VAST and VPAID compliant, | | Yes | PRO, ENTERPRISE AND ENGAGE PRODUCTS AVAILABLE FOR SITES WITH MORE
THAN 25,000 SOLVED CAPTCHAS PER MONTH. | | nucaptcha.com | | Likes 0 |
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| OpenCaptcha | |  | Does not require any regsitration | No | Yes size | No | PHP | No | No | | | Yes | | | opencaptcha.com | | Likes 0 |
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| ProtectWebForm | |  | | No | Yes | Yes | PHP, ASP | Yes | | | | Yes | | | protectwebform.com | | Likes 0 |
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| reCAPTCHA | reCAPTCHA is a free service that helps to digitize books,
newspapers and old time radio shows while preventing automatic form
filling by robots. |  | The service helps to digitize books or audio shows | Yes English, German, French, Dutch... (8 languages + custom) | Yes 4 themes + custom | Yes | PHP, ASP, Java/JSP, Perl... | Yes | Yes | | | Yes | | | recaptcha.net | | Likes 1 |
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| Solve Media | Solve Media offers the option to implement as security only or
monetize the space by allowing advertisements in addition to
security. |  | Fortune 1000 Advertisers | Top tier security (10 levels based on
spam activity) | Available for over a dozen languages and
platforms. | System detects spam activity and increases security
& readability difficult. | Yes English, French, German, Spanish, Italian, Japanese | Yes 4 themes and custom | Yes | PHP, Perl, asp, jsp, python, ruby, asp.net, phpBB, SML, vBulletin,
WordPress, Drupal, media wiki, dokuwiki, MyBB | Yes | Yes | Meredith Publishing, Internet Brands, CollegeHumor.com, AOL.com,
Vertical Scope | | Yes All free | Free to implement. | | solvemedia.com | | Likes 2 |
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| WebSpamProtect | WebSpamProtect.com allows you to add a verification image to your
web site forms to protect them against spam robots. The service
also provides full contact form management. |  | Online control panel to customize available captcha, or to create
full contact forms. | No | Yes | Yes | PHP, ASP, Perl | Yes | Yes for premium accounts only | | | Yes | Premium accounts enables SSL access, more customization, and full
contact forms.
- 500/month: $2.50/month or $25.00/year
- 5000/month: $4.50/month or $45.00/year
- 50000/month: $8.50/month or $85.00/year
| | webspamprotect.com | | Likes 0 |
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| Confident CAPTCHA | Confident CAPTCHA is a picture-based approach to CAPTCHA that asks
visitors to click on specific pictures to prove they are human. It
is very secure against bots and easy for people to use. Optional
advertising feature allows publishers to earn revenue. Confident
CAPTCHA is easy to use on smartphones and tablets -- no typing
required, users simply click/tap a few pictures to verify. |  | Highly customizable, mobile optimized, no typing required from
users -- simply click on a few pictures. Optional advertising
feature allows publishers to earn revenue. | Yes English, Spanish, French, German, Dutch, Russian, and many more languages available. | Yes Administrators can customize the CAPTCHA color, the number of images displayed an the CAPTCHA, the number of images users must click, and many other customization options. | Yes | PHP, ASP, Java, Perl, Python and Ruby. WordPress, Joomla and Drupal
plugins also available. | Yes http://wordpress.org/plugins/confident-captcha/ | Yes | | | Yes | Free for up to 50,000 displays of Confident CAPTCHA monthly.
Websites requiring more should contact us for Enterprise level
pricing. Websites of all sizes can use the optional advertising
feature to earn revenue. | | confidentcaptcha.com | | Likes 1 |
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User reviews and comments
Confident CAPTCHA should be added to this list: www.ConfidentCAPTCHA.com
There is no monetization or revenue at all with AdCaptcher, it is just a custom captcha system.