This is a comparison of online services which helps to prevent automated abuse of your site (such as automatic comment spam or registrations) by using a CAPTCHA to ensure that only humans perform certain actions.
While these services helps to reduce spam, they will not totally prevent it, since some humans add manually their comments.
These services usually shows a text in an image and visitors must type it to validate the form. To ensure accessibility, some services provide an audio CAPTCHA so that the visitors can listen to it, if they are unable to see the image.
A dedicated comparison has been created for services with
advertisements solutions combined:
|AdCaptcher||Ads Captcha||Adyoulike||are you a human||Captch Me||Captchas.net||NuCaptcha||OpenCaptcha||ProtectWebForm||reCAPTCHA||Solve Media||WebSpamProtect|
|Description||AdCaptcher enables you to build and monetize custom captchas.||ADSCAPTCHA™ offers complete multi-language CAPTCHA solutions, from free security-only CAPTCHAs, to premium CAPTCHAs featuring images and video.||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.||It is an alternative to CAPTCHA by using games : humans play but not bots...||Captch Me is an advertising captcha network.||Captchas.net servers provides CAPTCHA images and audio files you can use in html-forms to prevent robots from filling it.||NuCaptcha provides the only intelligent captcha product on the market today||reCAPTCHA is a free service that helps to digitize books, newspapers and old time radio shows while preventing automatic form filling by robots.||Solve Media offers the option to implement as security only or monetize the space by allowing advertisements in addition to security.||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.|
|Distinctive features||A new monetization method for your websites! Earn revenue by serving smart ads in your captcha.||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.||The Captcha is served as an Ad, so you can get money while securing your forms.||Fun way to check that the visitor is an human : he plays a game||Behavioral Analysis System that adjusts security on the fly- brandable, SLA, advertising, fully customizable.||Does not require any regsitration||The service helps to digitize books or audio shows||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.||Online control panel to customize available captcha, or to create full contact forms.|
|Multi-language||Yes||Yes English, French||No||Yes French, English (standard captchas only)||Yes Audio pronunciation: English, German, Italian, French, Dutch||Yes Fully Localizable||No||No||Yes English, German, French, Dutch... (8 languages + custom)||Yes English, French, German, Spanish, Italian, Japanese||No|
|Visual customization||Yes via CSS||No||No||Yes 2 themes||Yes Size, color custom design for audio or to refresh the captcha||Yes Skinless version available to fully customize.||Yes size||Yes||Yes 4 themes + custom||Yes 4 themes and custom||Yes|
|Code sample||PHP, Perl, Ruby, Python, .Net, Java||PHP, JSP, WordPress, Drupal||PHP, ASP, Perl, Python, JSP, Ruby||.Net, PHP, Java, various plugins||PHP||PHP, ASP||PHP, ASP, Java/JSP, Perl...||PHP, Perl, asp, jsp, python, ruby, asp.net, phpBB, SML, vBulletin, WordPress, Drupal, media wiki, dokuwiki, MyBB||PHP, ASP, Perl|
|Compatible SSL||Yes||Yes||Yes||No||Yes||Yes||Yes for premium accounts only|
|Notable web site using it||Quicken Loans||Yes, various, ISP's, VAST and VPAID compliant,||Meredith Publishing, Internet Brands, CollegeHumor.com, AOL.com, Vertical Scope|
|Free plan||Yes||Yes||Yes||Yes||Yes||Yes||Yes||Yes||Yes All free||Yes|
|Pricing||120 euros per year to remove captchas.net logo||PRO, ENTERPRISE AND ENGAGE PRODUCTS AVAILABLE FOR SITES WITH MORE THAN 25,000 SOLVED CAPTCHAS PER MONTH.||Free to implement.||Premium accounts enables SSL access, more customization, and full
It's free and fast to publish data into original tablesCreate a table