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CAPTCHA.ORG

Listing every captcha you can think of

Few technologies have ever been so disliked by both those who enforce its use
and those upon whom its use has been enforced — yet so widely adopted as
captcha.

With the spam flood at the website gates, and no viable alternatives anywhere in
sight, webmasters are simply left without a choice — and millions of captchas
are being solved every day.

Whether you like it or not — welcome to the world of CAPTCHA.


CAPTCHA DIRECTORY

Captcha Software
Captcha Services
Captcha Breakers
Captcha Alternatives


Q: So, what goes into this captcha directory?
A: According to its name the captchas will be an easy answer.

Q: But what a captcha is? How is it defined for the purpose of this directory?
A: If there is something that users have to solve... — it will satisfy a captcha
definition.

Q: So, all captcha-enabled form processing and CMS software also qualifies?
A: No, packaging is also a factor. It must be stand-alone captcha software or
captcha service built with the purpose of being embedded into something else.

Q: Anything else?
A: Captcha breakers and captcha alternatives are also welcome.

CAPTCHA SOFTWARE

Q: What fits within a captcha software description? Distorted text type captchas
only, or there is room for other types as well?
A: It is open to all non-trivial types of captcha software.

Q: What about new conceptual captchas with less then perfect software
implementations?
A: Even for them. If the concept is interesting and theoretically provides a
reasonable level of protection, it can find its place here.

BOTDETECT PHP CAPTCHA

Version3.0.1 StatusActive Release Date2015-04-07 Product
Homepagecaptcha.com/php-captcha.html Online democaptcha.com/demo Software
licenseCommercial List priceFree, $99 - $999 Free trialYes VendorCaptcha, Inc.
Vendor homepagecaptcha.com Captcha Algorithms60 Sound supportYes Reload
buttonYes Programming languagePHP Source code availableYes Captcha typeDistorted
Text Product typePHP CAPTCHA Library OS supportWindows, OSX, Linux 64-bit
supportYes DependenciesPHP, libgd, mbstring Inherited IDE supportAny PHP Editor
Language APIsPHP CMS pluginsWordPress, Laravel, CakePhp, CodeIgniter

last updated on 2015/07/02 14:15

BOTDETECT ASP.NET CAPTCHA

Version3.0.16 StatusActive Release Date2014-06-05 Product
Homepagecaptcha.com/asp.net-captcha.html Online democaptcha.com/demo Software
licenseCommercial List priceFree, $99 - $999 Free trialYes VendorCaptcha, Inc.
Vendor homepagecaptcha.com Captcha Algorithms60 Sound supportYes Reload
buttonYes Programming languageC# Source code availableYes Captcha typeDistorted
Text Product typeASP.NET CAPTCHA Component OS supportWindows 64-bit supportYes
Dependencies.NET Framework Inherited IDE supportVisual Studio 2003, Visual
Studio 2005, Visual Studio 2008, Visual Studio 2010, Visual Studio 2012, Visual
Studio 2013 Language APIsASP.NET CMS pluginsSharePoint

last updated on 2015/07/02 14:15

BOTDETECT ASP CAPTCHA

Version3.0.16 StatusActive Release Date2015-06-05 Product
Homepagecaptcha.com/asp-captcha.html Online democaptcha.com/demo Software
licenseCommercial List priceFree, $99 - $999 Free trialYes VendorCaptcha, Inc.
Vendor homepagecaptcha.com Captcha Algorithms60 Sound supportYes Reload buttonNo
Programming languageC# Source code availableYes Captcha typeDistorted Text
Product typeCOM CAPTCHA Component OS supportWindows 64-bit supportYes
DependenciesNone InheritedN/A IDE supportN/A Language APIsCOM, ASP CMS
pluginsNone

last updated on 2015/07/02 14:15

BOTDETECT JAVA CAPTCHA

Version3.0.Alpha2 StatusActive Release Date2015-06-06 Product
Homepagecaptcha.com/java-captcha.html Online democaptcha.com/demo Software
licenseCommercial List priceFree, $99 - $999 Free trialYes VendorCaptcha, Inc.
Vendor homepagecaptcha.com Captcha Algorithms60 Sound supportYes Reload buttonNo
Programming languageJava Source code availableYes Captcha typeDistorted Text
Product typeJava OS supportWindows, Linux, OSX 64-bit supportYes
DependenciesNone InheritedN/A IDE supportN/A Language APIsJava CMS pluginsNone

last updated on 2015/07/02 14:15

ASP SECURITY IMAGE GENERATOR

Version2.0 StatusR.I.P. Release Date2006-04-09 Product
Homepagewww.tipstricks.org Online demowww.tipstricks.org/example.asp Software
licenseCommon Public License List priceFree Free trialYes VendorEmir Tüzül
Vendor homepageUnknown Captcha AlgorithmsUnknown Sound supportNo Reload buttonNo
Programming languageASP Source code availableYes Captcha typeDistorted Text
Product typeASP CAPTCHA Script OS supportWindows 64-bit supportUnknown
DependenciesUnknown InheritedN/A IDE supportUnknown Language APIsASP CMS
pluginsUnknown

last updated on 2015/07/02 14:15

CAPTCHA ASP SCRIPT

Version1.0 Status Release Date2006-10-31 Product
Homepagewww.motobit.com/util/captcha Online demowww.motobit.com/util/captcha
Software license List priceFree Free trialYes VendorMotobit Software Vendor
homepagewww.motobit.com Captcha Algorithms Sound supportNo Reload buttonNo
Programming languageVB Script Source code availableYes Captcha typeUndistorted
Text Product typeASP Captcha Script OS supportWindows 64-bit supportUnknown
DependenciesOWC Inherited IDE support Language APIs CMS plugins

last updated on 2007/10/14 04:01

CAPTCHA IMAGE

Version1.01 Status Release Date2004-02-02 Product
Homepagewww.codeproject.com/aspnet/captchaimage.asp Online demoNot Available
Software license List priceFree Free trialYes VendorBrainJar Vendor
homepagewww.brainjar.com Captcha Algorithms Sound supportNo Reload buttonNo
Programming languageC# Source code availableYes Captcha typeDistorted Text
Product typeC# Captcha Class OS supportWindows 64-bit supportYes
Dependencies.NET Framework Inherited IDE support Language APIs CMS plugins

last updated on 2007/10/14 03:57

CAPTCHA SERVER CONTROL FOR ASP.NET

Version2.1 StatusActive Release Date2007-01-29 Product
Homepagewww.codeproject.com/aspnet/CaptchaControl.asp Online demo Software
license List priceFree Free trialYes VendorJeff Atwood Vendor
homepagewww.codinghorror.com Captcha Algorithms Sound supportNo Reload buttonNo
Programming languageVB.NET Source code availableYes Captcha typeDistorted Text
Product typeASP.NET Captcha Component OS supportWindows 64-bit supportYes
Dependencies.NET Framework Inherited IDE support Language APIsASP.NET CMS
plugins

last updated on 2007/10/20 13:42

FLORESENSE CAPTCHA CONTROL FOR ASP.NET

Version1.0 StatusActive Release Date2007-08-20 Product
Homepagewww.floresense.com/controls/dN/captcha/index.php Online demo Software
licenseCommercial List priceFree, $16 Free trialYes VendorFloresense Solutions
Vendor homepagewww.floresense.com Captcha Algorithms Sound supportNo Reload
buttonNo Programming language Source code availableNo Captcha typeDistorted Text
Product typeASP.NET CAPTCHA Control OS supportWindows 64-bit supportUnknown
Dependencies.NET Framework 2.0 Inherited IDE support Language APIs CMS plugins

last updated on 2007/10/20 13:42

NETXTREME/ASPXTREME CAPTCHA

VersionAll versions StatusR.I.P. Release Date Product Homepage Online demo
Software license List price Free trial VendorSafaByte, ComponentForge,
XtraComponents Vendor homepageEver-changing Captcha Algorithms Sound support
Reload button Programming language Source code available Captcha type Product
type OS support 64-bit support Dependencies Inherited IDE support Language APIs
CMS plugins

last updated on 2010/04/13 12:30

NetXtreme/AspXtreme CAPTCHA is Lanapsoft's BotDetect ASP.NET CAPTCHA rip-off
based on a decompiled BotDetect CAPTCHA source code. Unlike original, AspXtreme
CAPTCHA lacks a few features that 'the vendor' couldn't figure out, and is
enhanced with multiple bugs not present in the original version. Stay away from
it.

More about this particular rip-off, as well as about numerous other rip-offs
done by the same 'vendor' with an ever changing name/brand and URL you can find
at http://cheated.by.safabyte.net/.

Some folks find weird ways for making money.

TEXT DISGUISE CAPTCHA COMPONENT

Version1.0.0 Status Release DateUnknown Product Homepagewww.textdisguise.com
Online demowww.textdisguise.com/TextDisguise/Demo.aspx Software
licenseCommercial List priceFree, $49 - $159 Free trialYes Vendor27 Seconds,
Inc. Vendor homepagewww.27seconds.com Captcha AlgorithmsUnknown Sound supportNo
Reload buttonNo Programming languageVB.NET Source code availableYes Captcha
typeDistorted Text Product type.NET CAPTCHA Component OS supportWindows 64-bit
supportYes Dependencies.Net Framework InheritedN/A IDE supportUnknown Language
APIs.NET CMS pluginsNone

last updated on 2007/10/11 00:45

THE ASP CAPTCHA PROJECT

Version0.1 Status Release Date2005-06-07 Product
Homepagewww.planet-source-code.com/vb/scripts/ShowCode.asp
?txtCodeId=9204&lngWId=4 Online demoNot Available Software licenseGPL List
priceFree Free trialYes VendorCS Shyam Sundar Vendor
homepagecsshyamsundar.wordpress.com Captcha AlgorithmsUnknown Sound supportNo
Reload buttonNo Programming languageASP, VBScript Source code availableYes
Captcha typeDistorted Text Product typeASP CAPTCHA Script OS supportWindows
64-bit supportUnknown DependenciesGD by Thomas Boutell., GD is copyright 2005
Boutell.com, Inc. ActiveX Wrapper For GD by Trevor Herselman InheritedNone IDE
supportNone Language APIsASP CMS pluginsNone

last updated on 2007/10/10 23:43

U229.NO CAPTCHA.ASP

VersionUnknown Status Release Date2005-07-01 Product
Homepagewww.u229.no/stuff/Captcha Online demowww.u229.no/stuff/Captcha Software
licenseUnknown List priceFree Free trialYes Vendoru229.no Vendor
homepagewww.u229.no Captcha AlgorithmsUnknown Sound supportNo Reload buttonNo
Programming languageASP, CSS, JavaScript Source code availableYes Captcha
typeSimple Question Product typeASP CAPTCHA Script OS supportWindows 64-bit
supportUnknown DependenciesUnknown InheritedN/A IDE supportUnknown Language
APIsASP CMS pluginsUnknown

last updated on 2007/10/10 23:43

WEB WIZ CAPTCHA

Version3.0 Status Release Date2007-07-22 Product Homepagewww.webwizcaptcha.com
Online demowww.webwizguide.com/webwizcaptcha/demo Software licenseCommercial
List priceFree, $15 - $100 Free trialYes VendorWeb Wiz Vendor homepage Captcha
AlgorithmsUnknown Sound supportNo Reload buttonYes Programming languageASP
Source code availableUnknown Captcha typeDistorted Text Product typeASP CAPTCHA
Component OS supportWindows 64-bit supportUnknown Dependencies InheritedN/A IDE
support Language APIsASP CMS plugins

last updated on 2007/10/11 01:58

CAPTCHA SERVICES

Q: What is a captcha service? How is it defined for the purpose of this
directory?
A: If the task users have to solve is generated and in the real-time delivered
to the requesting user or website by a third-party... — it will satisfy a
captcha service definition.

Q: What about packaging?
A: Same as anywhere else within directory — only stand-alone captcha services
built with the purpose of being embedded into something else. No form-processing
services, please.

CAPTCHA.CC

VersionN/A StatusActive Release Date2008-10-09 Product Homepagewww.captcha.cc
Online demoYes Software licenseN/A List priceFree Free trialYes VendorDocument
Root, Inc. Vendor homepagewww.documentroot.com Captcha AlgorithmsN/A Sound
supportYes Reload buttonYes Programming languagePerl Source code availableNo
Captcha typeDistorted Text Product typeCAPTCHA Service OS supportN/A 64-bit
supportN/A DependenciesN/A InheritedN/A IDE supportUnknown Language APIsASP,
Python, PHP, ColdFusion, Perl, Java, Ruby CMS pluginsNone supplied

last updated on 2009/06/04 10:39

CAPTCHAS.NET

VersionUnknown Status Release DateUnknown Product Homepagecaptchas.net Online
demoNo Software licenseN/A List priceFree, $160/year Free trialYes VendorFelix
Holderied & Sebastian Wilhelmi Vendor homepageholderied.de,
seppi.de/index.html.en Captcha AlgorithmsUnknown Sound supportYes Reload
buttonNo Programming languageUnknown Source code availableNo Captcha
typeDistorted Text Product typeCAPTCHA Service OS supportN/A 64-bit supportN/A
DependenciesN/A InheritedN/A IDE supportNone Language APIsN/A CMS pluginsPlone

last updated on 2007/10/11 02:06

RECAPTCHA

VersionN/A Status Release DateUnknown Product Homepagewww.recaptcha.com,
recaptcha.sucks Online demorecaptcha.net/learnmore.html Software licenseN/A List
priceFree Free trialYes VendorCarnegie Mellon University Vendor
homepagewww.cmu.edu Captcha AlgorithmsUnknown Sound supportYes Reload buttonYes
Programming languagePython Source code availableUnknown Captcha typeDistorted
Text Product typeCAPTCHA Service OS supportN/A 64-bit supportN/A DependenciesN/A
InheritedN/A IDE supportUnknown Language APIsPHP, Python, Perl, Ruby, Java,
ColdFusion CMS pluginsWordPress, MediaWiki, phpBB, Movable Type, Drupal,
Symphony, Typo3, NucleusCMS, vBulletin, Joomla

last updated on 2007/10/14 04:03

SPAMERATOR

Version Status Release DateUnknown Product Homepagewww.spamerator.com Online
demoNone Software licenseN/A List priceFree Free trialN/A Vendor Vendor homepage
Captcha Algorithms Sound supportNo Reload buttonNo Programming language Source
code availableN/A Captcha typeUndistorted Text Product typeCAPTCHA Service OS
supportN/A 64-bit supportN/A DependenciesN/A InheritedN/A IDE supportN/A
Language APIsPHP CMS pluginsNone

last updated on 2007/10/14 04:01

TEXT DISGUISE CAPTCHA SERVICE

Version1.0.0 Status Release DateUnknown Product Homepagewww.textdisguise.com
Online demowww.textdisguise.com/TextDisguise/Demo.aspx Software licenseN/A List
priceFree Free trialYes Vendor27 Seconds, Inc. Vendor homepagewww.27seconds.com
Captcha AlgorithmsUnknown Sound supportNo Reload buttonNo Programming
languageVB.NET Source code availableNo Captcha typeDistorted Text Product
typeSOAP CAPTCHA Service OS supportN/A 64-bit supportN/A DependenciesN/A
InheritedN/A IDE supportUnknown Language APIsSOAP API CMS pluginsNone

last updated on 2007/10/11 00:46

CAPTCHA BREAKERS

Q: If this is a captcha directory, why are captcha breakers allowed at all?
A: Because one who is in the process of making a decision to deploy a captcha
needs to know about the current state of captcha breaking solutions — and then
later to periodically re-asses its standing against them.

Q: What types of "captcha breakers" one can expect to see here?
A: Various types of captcha breaking research articles, software, services (even
human based ones), etc.

AICAPTCHA

Version StatusInactive Release Date2005-01-30 Product
Homepagewww.brains-n-brawn.com/aicaptcha Online demoNo Software license List
price Free trialNo VendorCasey Chesnut Vendor homepagewww.brains-n-brawn.com
Captcha AlgorithmsN/A Sound supportN/A Reload buttonN/A Programming language
Source code availableNo Captcha typeCaptcha Breaker Product typeComment Spam Bot
OS support 64-bit supportN/A Dependencies Inherited IDE support Language APIs
CMS plugins

last updated on 2007/11/16 10:59

aiCaptcha is an excellent and easy to read article that includes a step by step
guide on breaking of a particular weak captcha with some serious stuff — but
without any rocket science involved in the process. And exactly because of that
lack of rocket science aiCaptcha is a must read for anyone thinking about
deploying captchas.

Even if you are not going to understand just about everything that is written in
the article, aiCaptcha will make you able to recognize a lot of weaknesses in
algorithms of many captchas that are available on the market today. In turn, you
will be able to avoid deploying those weak captchas on your website.

aiCaptcha source code and executables are not available to the public.

CAPTCHA KILLER

Version StatusUnknown Release DateUnknown Product Homepagewww.captchakiller.com
Online demo Software license List price Free trialYes Vendor Vendor
homepagewww.captchakiller.com Captcha AlgorithmsN/A Sound supportN/A Reload
buttonN/A Programming language Source code availableNo Captcha typeCaptcha
Breaker Product typeRESTfull CAPTCHA Breaking Service OS support 64-bit
supportN/A Dependencies Inherited IDE support Language APIs CMS plugins

last updated on 2007/11/17 04:41

The long-term status of Captcha Killer is a bit unclear at this moment.

While the CaptchaKiller website does not state anywhere that the Captcha Killer
is, or will be, out of business — the guy's post made 2007/09/24 clearly states:

"I'm facing legal trouble in the US. Can someone please help me move this
company offshore? Any tips? Who should I be talking to?"

It seems that Captcha Killer got at least the MySpace legal team on its back and
is now thinking about relocation. According to another post, the most likely
destination is Panama.

Unfortunately, Captcha Killer says nothing about their captcha breaking
technology :(

CAPTCHASOLVER

Version StatusR.I.P. Release DateUnknown Product HomepageURL used to be:
www.captchasolver.com Online demo Software license List price Free trialN/A
Vendor Vendor homepageURL used to be: www.captchasolver.com Captcha Algorithms
Sound supportN/A Reload buttonN/A Programming language Source code availableNo
Captcha typeCaptcha Breaker Product typeCaptcha breaking sweat-shop with Web
Service API OS support 64-bit supportN/A Dependencies Inherited IDE support
Language APIs CMS plugins

last updated on 2007/12/22 06:32

CaptchaSolver seems not to exist any more. The website is down, and we do not
think that we are going to hear about it again. At present, it is listed here
only because of historical reasons.

CaptchaSolver used to be captcha-breaking sweat-shop. Numerous download sites
still list CaptchaSolver API among their entries — but the download links lead
to nowhere.

Hopefully, there will be someone out there who still has a copy of CaptchaSolver
API. And if he/she is willing to forward it to captcha.org editors — in the
future the CaptchaSolver entry might also get some educational reasons for its
existence, beside the historical ones.

GOOGLE27

Version Status Release DateUnknown Product HomepageURL is:
google27.com/index.php?option=com_content& task=view&id=1&Itemid=9 Online demo
Software license List price Free trialNo VendorGoogle27 Solution Vendor
homepageURL is: google27.com Captcha Algorithms Sound supportN/A Reload
buttonN/A Programming language Source code availableNo Captcha typeCaptcha
Breaker Product typeCaptcha-breaking sweat-shop OS support 64-bit supportN/A
Dependencies Inherited IDE support Language APIs CMS plugins

last updated on 2007/12/22 06:34

Google27 is just another of those shady captcha-breaking sweat-shop entities
that claim to provide the dark-side with a technology and low-cost labor needed
for bypassing captchas on high-value-target websites such are MySpace and Yahoo.

Google27 claims they will do, as a professional service, all the integration
work between your existing bot software and their captcha-entry agents.

Google27 website seems to be banned from Google index so we are not providing a
direct link to it. Use copy/paste instead. We simply do not want to take the
risk and make Google algorithms nervous about our site as well. Ironically, it
seems that Google does not ban Google27 from AdWords :)

PWNTCHA

VersionUnknown Status Release DateUnknown Product Homepagesam.zoy.org/pwntcha
Online demoNo Software licenseUnknown List priceN/A Free trialNo VendorSam
Hocevar Vendor homepagesam.zoy.org Captcha AlgorithmsN/A Sound supportN/A Reload
buttonN/A Programming languageUnknown Source code availableNo Captcha
typeCaptcha Breaker Product typeNon-CAPTCHA Library OS supportUnknown 64-bit
supportUnknown DependenciesUnknown Inherited IDE supportUnknown Language
APIsUnknown CMS pluginsN/A

last updated on 2007/11/17 05:07

According to the PWNTCHA website PWNTCHA is 'simply a toolkit of image
manipulation functions, and a list of known CAPTCHAs with the associated list of
image operations to apply in order to decode each of them.'

So far we were unable to find the specifications of the PWNTCHA "toolkit". Also,
we were unable to find PWNTCHA's "associated list of image operations to apply
in order to decode each of them." Maybe we were looking on all the wrong places.
Who knows.

If we were able to find those missing parts we would recommend PWNTCHA as a
something that one interested in captchas should read. This way, there is really
nothing to recommend.

PWNTCHA source code and executables are also not available to the public.

CAPTCHA ALTERNATIVES

Q: If this is a captcha directory, why are captcha alternatives allowed at all?
A: Because there are some usage scenarios where a captcha alternative may solve
at least a part of the same problems that captchas do.

Q: What types of captcha alternatives one can expect to see here?
A: For the time being it is only content-inspection type, with more types to
follow on later.

Q: What about packaging?
A: Same as anywhere else within this directory, only stand-alone software or
services built with the purpose of being embedded into something else.

AKISMET

VersionN/A Status Release DateUnknown Product Homepageakismet.com Online demoN/A
Software licenseN/A List priceFree, $5 - $750+/month Free trialYes
VendorAutomattic, Inc. Vendor homepageautomattic.com Captcha AlgorithmsN/A Sound
supportN/A Reload buttonN/A Programming languageUnknown Source code availableNo
Captcha typeAlternative Technology Product typeNon-CAPTCHA Service OS supportN/A
64-bit supportN/A DependenciesN/A InheritedN/A IDE supportUnknown Language
APIsPython, PHP, ColdFusion, Perl, Java, Ruby, Ruby on Rails, Lasso, .NET CMS
pluginsMovable Type, Drupal, phpBB, Blojsom, Bloxsom, Geeklog, Serendiptity,
Nucleus, b2evolution, WordPress, PunBB, Expression Engine, Coppermine, Lifetype,
Simple Machine Forums, Phorum, tDiary, MyBulletinBoard, PostNuke, Joomla, EZ
Publish

last updated on 2007/11/09 21:38

Akismet might be an interesting captcha alternative for those folks to whom
comment spam is the only problem caused by bots.

Technologically, Akismet is based on some form of automated spam-filtering. The
self-correction of algorithms is made possible by the feedback that is
constantly flowing-in through the built-in collaborative component.

If you are member of the above-mentioned group, and the web side of your
business can survive some false positives and negatives that will inevitably
keep happening forever as a result of Akismet's technological foundation, it
might be worth to give Akismet a try.

While Akismet will not solve your spam problems, it will make living with them
much easier.

DEFENSIO

Version1.1 StatusActive Release Date2007-11-07 Product Homepagedefensio.com
Online demo Software license List priceFree, $5 - $50+/month Free trialYes
VendorKarabunga, Inc. Vendor homepagekarabunga.com Captcha Algorithms Sound
supportN/A Reload buttonN/A Programming language Source code availableNo Captcha
typeAlternative Technology Product typeNon-CAPTCHA Service OS support 64-bit
supportN/A Dependencies Inherited IDE support Language APIsRuby on Rails, .NET,
Java, PHP CMS pluginsWordPress, PixelPost

last updated on 2007/11/09 21:36

Copyright © 2007-2016 Captcha, Inc., all rights reserved

All brand and company names mentioned on this page are used for identification
purposes only and are trademarks or registered trademarks of their respective
owners.

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