WP Captcha-Free

Description:

WP Captcha-Free blocks comment spam by using a combination of time-based hash (a.k.a. Time Based Tokens, TBT) and JavaScript (AJAX). When a comment is posted the plugin validates a hash based on time (and some other parameters). Comments posted via automated means will not have a hash or will have an expired hash and will be rejected. Unlike using a captcha, this does not place any burden on the commenter.

Additionally, WP Captcha-Free uses ajax to get the hash only when the form is submitted instead of adding it statically to the page (which is cached by caching plugins). This adds another layer of security and makes it compatible with caching plugins like WP-Cache.

Features:

  1. Blocks automated comment spam and ensures that your commenters are human.
  2. Works without inconveniencing visitors with CAPTCHAs, challenge questions, etc.
  3. The plugin requires no database access and adds almost zero overhead.
  4. The plugin works out of the box without any configuration or setup.
  5. Compatible with all cache plugins, including WP-Cache.
  6. Doesn’t require editing any .php files.

Installation:

Just download the .zip file and upload the file ‘captcha-free.php’ to your ‘/wp-content/plugins’ directory. Now login to the Wordpress administration area and activate it under the “Plugins” section. That’s it! WP Captcha-Free will start blocking comment spam behind the scenes.


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Size: 2.6 KB
Downloads: 9000 [Download Now]

163 Comments

  1. dave
    Posted February 21, 2008 at 6:52 pm | Permalink

    Ok cool deal

  2. Posted February 25, 2008 at 10:03 am | Permalink

    Grabbed the plugin and testing it on a new site now. Using the latest version of WP. SHall give you a shout should i run across any problems.

    Regards
    Off-it

  3. Posted March 1, 2008 at 12:26 am | Permalink

    I wonder how you can assume a result made by computer-generated computations (using JavaScript) ensures a comment is written by a humain being. All your plugin does is to ensure one uses a browser to post a comment. Say I develop a Firefox plugin to spam your blog. Your plugin won’t be able to stop it.

    Moreover, what happens if a visitor has deactivated JavaScript in his browser? What would happen if the user is behind a proxy server? I guess visitors won’t be able to comment in both cases…

  4. iDope
    Posted March 1, 2008 at 12:57 am | Permalink

    You are right about the first part. Yes, someone can use a browser to spam. But do spammers do that? Won’t it considerably slow them down? No plugin is foolproof. Spam and anti-spam tech evolves constantly. For *now* this works.

    Yes, it clearly does require JavaScript. But, about 94% users have JavaScript enabled as of Jan 2007 (source: http://www.w3schools.com/browsers/browsers_stats.asp). That number is likely more now if you notice the trend. For me its a choice between using a captcha and inconveniencing 100% of my visitors or <6%.

    No, proxies don’t matter (unless the proxy filters out JS).

    BTW, thanks for your comments. If you have any suggestions please do let me know.

  5. Dean
    Posted March 2, 2008 at 5:33 am | Permalink

    It looks like you got your idea and the name of your plugin from WP-SpamFree. Also you have copied most of the text in the bullet points of your description from that plugin as well-almost word for word. You need to be careful because that is a DMCA violation. With GPL you have to give attribution for code,but you can’t copy marketing text or descriptions.

  6. iDope
    Posted March 2, 2008 at 11:33 am | Permalink

    > It looks like you got your idea and the name
    > of your plugin from WP-SpamFree. Also you have
    > copied most of the text in the bullet points
    > of your description from that plugin as
    > well-almost word for word.

    Not true, in fact I first saw WP-SpamFree after I had completed the plugin and was writing a description (not very good at documentation, I was looking what other similar plugins had written). After reading WP-SpamFree’s feature list I couldn’t write mine another way since both plugins essentially offer the same advantages. But you are right, that’s a terrible thing to do in the age of DMCA (though I am not a US citizen :) ) and I’ll reword my feature list in the next update.

    The idea is not really the same either. My plugin uses time-based hash (generated on the server side) and JavaScript (AJAX) while WP-SpamFree uses JavaScript and cookies. If you look at the code I am sure you’ll find no similarities there either.

    Anyways, thanks for looking at my plugin and I hope you’ll still give it a try. Criticism (constructive or otherwise) is always welcome :) .

  7. zoz
    Posted March 7, 2008 at 2:19 am | Permalink

    Nice plugin :)

  8. Samuel
    Posted March 8, 2008 at 7:30 pm | Permalink

    Hi!

    Your plugin is very promising, but it doesnt work together with Better Comments Manager.

    Could do you make your plugin compatible with it? (maybe make some check about if the user is logged, and if logged no need to make hash check).

  9. kakiyomi
    Posted March 9, 2008 at 1:59 am | Permalink

    oh thx 4 plugin

  10. Posted March 10, 2008 at 9:09 am | Permalink

    Hi there, I’d love to use your plugin but unfortunately it stopped all comments from comming in. Once the user clicks “submit comment” it says “please wait…” and nothing happens. The theme we are using is wp-magazine.com

    thanks!

  11. iDope
    Posted March 10, 2008 at 9:36 am | Permalink

    Hi Sandra,

    Thanks for letting me know. Can you enable the plugin on your blog for a little while so I can see what’s going on?

  12. Posted March 10, 2008 at 12:30 pm | Permalink

    Hi,

    I had not uploaded the .php file right into the plugin directory. Ooops! IT works now and it’s a beauty! Thank you soooooo much!

  13. Posted March 21, 2008 at 5:51 pm | Permalink

    Hi There,

    I installed the plugin and noticed that my comment spam levels dropped to zero. This is great! However, I tried to post a comment on one of my posts, in response to some elses comment, and noticed that the form would not sumbit. When I clicked on the “Post Comment” button, it turned into a “Please wait” and then just stopped. The comment never got posted. I tried several times with the same result. When I de-activated the plugin I could post comments again.

    Any idea what might be causing this? Anyone else experienced a similar issue?

    Thanks,
    Stephen

  14. iDope
    Posted March 21, 2008 at 10:41 pm | Permalink

    Stephen,
    You may have uploaded the captcha-free.php file to a sub-directory of your plugins folder. Please upload captcha-free.php directly to /wp-content/plugins folder. Let me know if this works for you.

  15. Nick R
    Posted March 27, 2008 at 3:32 am | Permalink

    New to blogging and gutted to have spam comments – got my hopes up that I had some readers! When I found your plugin via Wordpress the hopes have gone up again. I will let you know if there are any issues. Thanks for your time and know how.

  16. Adrian
    Posted April 2, 2008 at 7:22 am | Permalink

    Would be cool to see this work on the user registration form.

    thanks.

  17. Marco
    Posted April 10, 2008 at 3:46 am | Permalink

    Stephen,

    I bet you are running WP 2.5
    I had captcha free running on 2.3.?
    After upgrading to 2.5 i had the same as you. I gues captcha-free doesnt work on 2.5

  18. Jim Robson
    Posted April 11, 2008 at 7:27 am | Permalink

    It’s not working for me. I installed and activated the plugin, but the spam is getting right through.

  19. Frank Zondo
    Posted April 11, 2008 at 2:32 pm | Permalink

    Thanks for a great plug-in!

  20. nogu
    Posted April 19, 2008 at 12:59 pm | Permalink

    nice work

  21. S
    Posted April 22, 2008 at 7:48 am | Permalink

    Hi,

    I keep getting the error: Invalid Data: Please go back and try again.

    I figure it has to do with the code below, but I can’t seem to make it work. It does work for some visitors but not others.
    // Validate the hash
    add_action(’preprocess_comment’, ‘cf_comment_post’);
    function cf_comment_post($commentdata) {
    // Ignore trackbacks
    if($commentdata['comment_type']!=’trackback’) {
    // Calculate the timehash that is valid now
    $timehash=timehash($commentdata['comment_post_ID'],time());
    // Calculate the timehash that was valid 1 hour back to give some cushion
    $timehash_old=timehash($commentdata['comment_post_ID'],time()-3600);
    if($_POST['captchafree']!=$timehash && $_POST['captchafree']!=$timehash_old)
    wp_die(’Invalid Data: Please go back and try again.’);
    }
    return $commentdata;
    }

  22. Posted April 22, 2008 at 11:49 am | Permalink

    Maybe you can update your entry/plugin to show if/make it wordpress 2.5 compatible.

  23. Jason
    Posted April 25, 2008 at 12:16 pm | Permalink

    Simple suggestion for future updates: the tag containing “Spam protection by WP Captcha-Free” should have an id attribute.

    Anyway, nice plugin. Seems to be working well for me.

  24. Nate
    Posted April 28, 2008 at 12:03 pm | Permalink

    I’ve installed Captcha-Free on my blog, running WP 2.5.1, when a comment is posted, you just get forwarded to Google, for some reason, and the comment isn’t posted?!

    http://hintofsarcasm.com is the address, any ideas?

  25. Posted April 29, 2008 at 11:24 am | Permalink

    I installed this the other day, and it’s fabulous. I’m getting more comments than I was with the often faulty, always irritating captcha software I was using before. Just one thing, though. People who use AOL’s browser are getting an error when they try to post: Invalid data. Please go back and try again. Any thoughts I can pass along to them, or are they SOL?

  26. Fox
    Posted May 2, 2008 at 4:24 pm | Permalink

    Thanks. This is great.

  27. lala
    Posted May 4, 2008 at 11:22 am | Permalink

    really great :)

  28. Posted May 5, 2008 at 5:20 pm | Permalink

    hi there .thanks for plugin:

    Does anybody know if tis script is compatible with Wordpress 2.5.1?

    Thanks in advance for any help on this!

    best regards

  29. iDope
    Posted May 7, 2008 at 3:38 am | Permalink

    WP Captcha-Free is not compatible with Wordpress 2.5, yet.

  30. Adhi Yudho
    Posted May 10, 2008 at 1:58 pm | Permalink

    Thankyou.. i will try this plugins.. :)

  31. Posted May 10, 2008 at 1:59 pm | Permalink

    @iDope, yes .. true.. :( i’m not read your las comment… sorry.. but i will wait your next version… :)

  32. Hello Dudes
    Posted May 12, 2008 at 12:37 pm | Permalink

    So this doesn’t seem to work anymore.. I don’t see the captcha and it’s not asking me to confirm any image….

  33. Kevin
    Posted May 13, 2008 at 10:44 pm | Permalink

    great idea and work! thanks

  34. Martin
    Posted May 14, 2008 at 5:24 am | Permalink

    Is there any img verification for posting?

  35. iDope
    Posted May 14, 2008 at 5:40 am | Permalink

    The aim of this plugin is not having to use image verification.

  36. BaBy RoDrI
    Posted May 30, 2008 at 9:16 pm | Permalink

    Mmmm…. que mal ya no funciona en Wordpress 2.5 :(

  37. Thomas
    Posted June 17, 2008 at 6:17 am | Permalink

    When people try commenting on my Wordpress MU site all it does now after you click submit comment is to change that button to “Please wait”. So no new comments can be added.

    100% spam free though :)

  38. Webspider
    Posted June 20, 2008 at 11:00 am | Permalink

    Work in new version WP ?

  39. Amiro
    Posted June 28, 2008 at 7:37 am | Permalink

    Work PERFECT !

  40. iDope
    Posted July 8, 2008 at 9:49 am | Permalink

    @Thomas: Please make sure you copy the “captcha-free.php” file directly to the wordpress plugins folder and not to a subfolder.

  41. Philix
    Posted August 1, 2008 at 4:20 am | Permalink

    This is a great plugin

  42. Jason
    Posted August 7, 2008 at 7:51 pm | Permalink

    Wordpress: 2.6
    Theme: Redie 3.0 by Steve Arun

    I have installed your plug-in and I get the following message after I try and comment on a post:

    Invalid Data: Please go back and try again.

    I have it disabled currently but would love to give it some use… spam bots are so annoying…

    Thanks!

  43. iDope
    Posted August 8, 2008 at 3:34 am | Permalink

    @Jason: Are you sure you copied the captcha-free.php file to /wp-content/plugins directly and not to a sub-folder?

  44. Posted August 8, 2008 at 11:57 am | Permalink

    @iDope: Thanks for the quick response. Yes I am sure that captcha-free.php is in /wp-content/plugins and not a subdirectory. I am assuming you are considering the wordpress directory the root? I deleted and just now redownloaded from this page and uploaded. Still nothing though. I get the same error.

    permissions are 644 so I don’t think that is any issue. there isn’t any modifications to the template code that needs to be done, is there? (As I do not have a default template)

  45. kitich
    Posted August 28, 2008 at 3:43 am | Permalink

    Great plugin, tnx.

    But i have problem – it’s ok to comment without login to wp, but if i login to my wp i see “Invalid Data: Please go back and try again.”

    PS plugin is in root of wp-content/plugins/

  46. Madeira
    Posted October 9, 2008 at 6:27 am | Permalink

    Hi

    We are also going to start a blog soon and were wondering how to takle comment spam.

    Thanks for the info!

  47. Internet Marketing
    Posted October 23, 2008 at 3:32 pm | Permalink

    It works in a very simple way, great work!

  48. busby seo test
    Posted November 18, 2008 at 5:33 am | Permalink

    Would be cool to see this work on the user registration form.

    thanks.

  49. ulu
    Posted December 23, 2008 at 8:45 am | Permalink

    same error as the other guy
    Invalid Data: Please go back and try again.

  50. Page Rank
    Posted January 3, 2009 at 5:43 pm | Permalink

    Works perfect in my WP 2.7 !

  51. iDope
    Posted January 7, 2009 at 12:57 am | Permalink

    @kitich: I think your theme is not calling the ‘comment_form’ action when you are logged in.

  52. Posted January 14, 2009 at 8:22 pm | Permalink

    “The article is very informative as well as so creative. You have very great knowledge having this subject. So nice! It’s a great to see you here.

    Thanks!

  53. zoomag
    Posted January 23, 2009 at 4:38 pm | Permalink

    Grabbed the plugin and testing it on a new site now. Using the latest version of WP. easy installed and easy in use! this plugin helped alot and I did noticed that my comment spam levels dropped well. Thank alot!))

  54. MAC
    Posted January 27, 2009 at 11:54 am | Permalink

    HI I cant seem to work it out

    Everytime i try to post a comment i keep getting this mesage: Invalid Data: Please go back and try again

    I have the plugin in the plugins folder (_root)

    What can i do?

    Cheers!

    MAC

  55. smart maxx
    Posted January 31, 2009 at 4:29 am | Permalink

    http://wordpresssupplies.com/wordpress-plugins/captcha-free/

    This plugin doesn’t works. It shows only link to this page and no picture.

  56. iDope
    Posted January 31, 2009 at 6:54 am | Permalink

    @smart maxx: I think you missed the point of this plugin. It stops spam *without* captcha.

  57. iDope
    Posted January 31, 2009 at 6:55 am | Permalink

    @MAC: Send me a link to your blog and I’ll check it out.

  58. sundhar
    Posted February 26, 2009 at 10:36 pm | Permalink

    nice plugin

  59. Irfan Faruki
    Posted March 3, 2009 at 7:08 am | Permalink

    Plugin does not seems to work fine with wp 2.7. Any ideas?

  60. John Barrett
    Posted March 6, 2009 at 1:31 am | Permalink

    Is this working on my blog? I thought that I would get a enter code below the captcha numbers/letters. ON mine nothing is happening. My blog is at http://blog.meleana.info it is a blog about flash, but I get all these porn comments, I don’t see the connection. Wordpress is too hard, and am not sure if I want to continue blogging as I spend way too long delete spam, yikes!

    Thanks so much for all your hard work on creating some files to help prevent spam, I appreciate all your work.
    Johnny

  61. 0% nazwy
    Posted March 8, 2009 at 1:34 pm | Permalink

    Nice. I like it!

  62. Rolando
    Posted March 13, 2009 at 11:42 am | Permalink

    Excellent, thanks for the plugin!

  63. Jack Clarke
    Posted March 26, 2009 at 1:22 pm | Permalink

    Added this cool plugin and my spam went from over 40 a day to zero, nice ! WP 2.7.1 by the way.

  64. Posted March 26, 2009 at 11:02 pm | Permalink

    @Irfan Faruki: What error are you getting?

    @John Barrett: The purpose of this plugin is *not* have the commenter to type a CAPTCHA answer.

  65. iDope
    Posted March 26, 2009 at 11:06 pm | Permalink

    BTW, I have released a new CAPTCHA plugin, more secure but still does not require commentors to type a CAPTCHA. Just requires a click to solve.

    http://wordpresssupplies.com/wordpress-plugins/clickcha/

  66. Posted April 5, 2009 at 4:03 am | Permalink

    Thanks for this great plugin, spam influx went down to zero. But somehow I get an error (http 500) on my site, when I am using MS Internet Explorer 7 to leave a comment. Firefox works fine.

  67. Toni
    Posted April 18, 2009 at 2:23 pm | Permalink

    The very best :)

  68. SSG
    Posted April 20, 2009 at 12:16 am | Permalink

    I absolutely LOVE this plugin-there has been NO spam since I started using it.

    However, the last few days, I’ve noticed it will sometimes throw an “invalid data” error when a legitimate comment is submitted. It *seems* to be related to the use of ellipses (… at the end of a statement) but I’m not 100% sure.

    Using Wordpress 2.7.1, with the latest version of Captcha Free.

    Any ideas?

  69. Posted May 6, 2009 at 5:12 pm | Permalink

    Promising plugin, but, 2 errors:
    1. Stops responses in the admin forms.
    2. Stops pingbacks, and the “trackback” test is commented out!

  70. Posted May 30, 2009 at 12:30 pm | Permalink

    nice plugin, but there seems to be a bug in the code whereby if there are more 2 or more forms on a page, and if multiple forms have a ’submit’ element id for the submit button, then the 1st form will get submitted instead.

    so, if the 1st form is a search box, it will submit a search query instead of the comment form.

    to solve it, change: document.getElementById(’submit’).click();

    to: document.getElementById(’commentform’).elements['submit'].click();

  71. Posted June 4, 2009 at 4:38 am | Permalink

    Hello!
    Nice plug-in but I can’t make it work! I always have the “invalid-data” error…
    php file is in the plugin directory.

    Can you help me?

  72. Jimmy
    Posted June 4, 2009 at 9:04 am | Permalink

    Plugin not working, get the following message when submitting a comment:

    “Invalid Data: Please go back and try again.”

    Using 2.7.1 WP version and tested on Firefox and Safari. The plugin is in the plugins root folder. The idea is great but it seems only a few here manage to make it work.

  73. Posted June 10, 2009 at 7:16 am | Permalink

    “Invalid Data: Please go back and try again.” This error appears when visitors posting comments from any version of IE (for now I have IE8 and testing whith it).

    WP 2.7.1 php file in /content/ directory.

    The problem appeared after upgrade to WP 2.7 and makes plugin useless. Deactivating solve the problem.

  74. Posted June 10, 2009 at 7:18 am | Permalink

    * wp-content/plugins/ directory sorry

  75. iDope
    Posted June 15, 2009 at 1:54 am | Permalink

    @ibrahim: Your theme may be at fault here. As per HTML specs element IDs should be unique:

    http://www.w3.org/TR/REC-html40/struct/global.html#h-7.5.2

  76. Web Design Quote
    Posted June 18, 2009 at 1:13 am | Permalink

    I appreciate all your work for creating the files to help prevent from spam. This type of button is helpful for the commenter to post their comment without any error.Thanks for the post.

  77. Posted June 18, 2009 at 10:34 am | Permalink

    Running WP 2.7 and the most recent version of WP Captcha Free and it is apparently working nicely.

  78. Posted June 20, 2009 at 1:18 am | Permalink

    Hello, I’ve been using your plugin for a few days and I have both a question and a comment.

    Firstly, the comment: on line 86 of captcha-free.php you open a <small> tag but never close it. Just thought I’d point that out.

    Secondly, why don’t you use your own plugin on your comment forms here?

  79. iDope
    Posted June 20, 2009 at 2:18 am | Permalink

    @Mythender: Thanks for the feedback. But I do close the <small> tag. Maybe you have an older version?

    I also wrote the Clickcha plugin I use here and it got the space since its the newer one :)

  80. Posted June 20, 2009 at 10:17 am | Permalink

    ahh I see about Clickcha

    as for the tag, I downloaded and installed version 0.5 of the plugin automatically through the wordpress plugin directory and everything below my comment form became… well… small….

    reading the document source I found the missing tag and looking into the code of your plugin led me to line 87:
    Please note: JavaScript is required to post comments.

  81. closeouts
    Posted June 26, 2009 at 4:05 am | Permalink

    HI
    Nice plug-in but I can’t make it work! I always have the “invalid-data” error…
    php file is in the plugin directory.

    help me

  82. iDope
    Posted July 3, 2009 at 3:01 pm | Permalink

    I have released a new version in which the check is bypassed for logged-in users. Replying to comments from Wordpress admin should work now.

  83. Posted July 3, 2009 at 4:04 pm | Permalink

    I did an automatic upgrade through my 2.8 WP site and got this message:

    Fatal error: Call to undefined function wp_get_current_user() in /home/nispiros/public_html/wordpress/wp-includes/capabilities.php on line 920

    Afterwards I couldn’t get to the site until I deleted the plugin through FTP .

  84. Posted July 3, 2009 at 4:17 pm | Permalink

    I get the same exact error as rolando.

    AHHH. Any chance of getting the old version up or the new one fixed? I really like this plugin. But as rolando I had to delete it via FTP to get my blog running again :-(

  85. iDope
    Posted July 4, 2009 at 12:49 am | Permalink

    Result of late night coding :(

    This has been fixed now, please get the latest version.

  86. Basyarah
    Posted July 4, 2009 at 3:47 am | Permalink

    this plugin have been installed on my web

  87. Posted July 4, 2009 at 5:01 am | Permalink

    Thank you! Working again :-)

  88. Posted July 4, 2009 at 8:40 am | Permalink

    Thanks for the fix!

  89. Posted July 9, 2009 at 8:04 pm | Permalink

    Getting the “Invalid data” error when submitting. I’ve left it up for now at my site above. I made sure I copied it to the root of my wp-content/plugins directory and activated it. Thanks for any help you can provide.

  90. Posted July 9, 2009 at 8:56 pm | Permalink

    Ok, here’s what I see. $_POST['captchafree'] seems to not be being populated. It looks like my theme (Fusion) is calling comment_form:

    ID); ?>

    Not sure if that’s correct or not, but maybe that helps. Thanks again.

  91. iDope
    Posted July 10, 2009 at 12:00 am | Permalink

    @Cory: Looks like your theme doesn’t have the ‘comment_form’ hook. Enter the following code right before the closing tag in the comments.php file of the theme.

    <?php do_action(’comment_form’, $post->ID); ?>

  92. Posted July 20, 2009 at 11:35 pm | Permalink

    Hello iDope,

    thanks a lot for the beautiful plugin…. Its working fine for me….

    I came across this page searching for “Invalid Data: go back and try again” error…

    I am not getting the error in ur plugin but in “Wordpress Threads Comment” plugin…
    In that plugin I had enabled AJAX support. I tried to debug and found that it works fine till displaying the messsage “submitting comment……..” But after that the xmlhttprequest.status = 500 instead of 200. Do you have any idea about where it is failing ?

    As soon as i deactivate the plugin , all works fine and visitors and post comment.

    Also point is that if I am logged in as Admin and try to post the comment, it works fine. !!!

    Most of the comments on that plugin with the :Invalid data…..” problem are unsolved and unanswered :(

    It would be very kind of you if u could just guide me….

    thanks a lot….

  93. Posted July 21, 2009 at 8:57 am | Permalink

    Hello iDope,

    wasn’t expecting that u wudn’t approve my comment….

    btw, it wasn’t the problem of the WP Thread Comments Plugin but now I think it was the problem of this plugin…

    As soon as I disabled the WP Captcha Free Plugin, the ajax comment started working !!!

    btw, I even tried to use other ajax comment plugin but same problem with all….

    So can u guide me what should i do ??

    I hope u won’t unapprove this comment as it is pertaining to YOUR plugin problem…

    thanks for the help… :)

  94. Posted July 21, 2009 at 9:02 am | Permalink

    Hello idope,

    I m really sorry… when i made the previous comment, the last comment that i was able to see was urs i.e. of July 10.. so i felt that u unapproved it :(

    but after i submitted the above one, the previous one was also visible… :)

    thanks….

  95. active xtream
    Posted July 24, 2009 at 3:30 pm | Permalink

    Really nice n cool plugin..
    thanks for sharing..

  96. Posted July 24, 2009 at 9:40 pm | Permalink

    This plugin is GREAT, it works so smoothly! Thank you so much!

  97. Gyro
    Posted July 31, 2009 at 8:05 am | Permalink

    Hi there, any chance you can ajax your clickcha plugin so a new page is NOT shown when there is an error? just an error message?

    Thanks, ps great plugin!

  98. iDope
    Posted July 31, 2009 at 8:28 am | Permalink

    @Sapan: I don’t think this plugin can coexist with “Wordpress Threads Comment” as they both control how the comment gets posted using ajax.

    @Gyro: The plugin does use ajax and most of your genuine commenters (the ones that have Javascript enabled) will not see that page.

  99. Deals Hunt
    Posted August 2, 2009 at 8:50 pm | Permalink

    wow, cool deal and nice n cool plugin
    thanks for sharing !

  100. Posted August 11, 2009 at 8:27 pm | Permalink

    This is one of the most useful plugins I have come across. It is great to be able to eliminate spam while not inconveniencing your blog visitors. Great job,

  101. Evgeny
    Posted November 21, 2009 at 1:02 pm | Permalink

    Thanks a lot. Such a nice plugin.

  102. seksi iç giyim
    Posted December 4, 2009 at 1:38 am | Permalink

    Really nice n cool plugin..
    thanks for sharing

  103. LEONG POH YUIN
    Posted January 19, 2010 at 1:06 am | Permalink

    The omy.sg linked me here now.

    I have problems submitting blog reply to chimkang’s blog in omy.sg

    Please help me as i like to go to his blog and i share with friends there…..pls don’t disregard me ! Please !

  104. iDope
    Posted January 19, 2010 at 1:15 am | Permalink

    @LEONG: I was able to post a comment just fine on your blog. Are you getting an error?

  105. luis
    Posted March 3, 2010 at 11:36 am | Permalink

    does it work with wp 2.9.2?

  106. Mouad
    Posted March 17, 2010 at 11:35 am | Permalink

    I wonder why you yourself use another captcha plugin (the biggest circle) to block spam comments !

    Should you not rely solely on your plugin if it indeed works ?

    Also, I would like to understand how exactly this plugin works. I read above, but didnt quite understand, and not being Bill gates, I wish you would explain in more simple words, how does this plugin work, and does it work with all languages, including blogs in right to left langs, like ARabic ?

  107. Jon
    Posted March 30, 2010 at 9:15 pm | Permalink

    I am using a theme based on Kubrick and some, but not all, users get “Invalid data: Please go back and try again.” when trying to enter a comment.

  108. jonny
    Posted April 8, 2010 at 4:41 am | Permalink

    Sorry im new to this but i want to know if it’s posible to use this plugin on blogspot or it just for Wordpress?

    Thanks for your answers

  109. @Drivelry
    Posted April 8, 2010 at 8:02 pm | Permalink

    Looks like someone has now built a bot / tool that gets around it. My spam died off completely and now is back as of a couple of months ago.

  110. dirk
    Posted April 11, 2010 at 7:32 am | Permalink

    What a nice Anti Spam Tool. i just startet and spam is really one of my biggest problems till today. Even the normal Captcha ist not function

    Thanks a Lot

  111. Angelis Thorton
    Posted April 13, 2010 at 6:30 am | Permalink

    Does this automatically reject Links? Or does it only reject duplicates? And does it also recognize proxies? Thanks in advance for the incoming answers.

  112. Jake
    Posted April 25, 2010 at 10:01 pm | Permalink

    I just got 3 comments on 3 separate posts, tonight from the same spammer. They each had like 50 links in them. I have the built-in WP spam control set to hold in moderation anything with over 2 links, yet the comments were posted anyway. Does your plugin override the normal wp settings?

  113. Petrunya
    Posted April 27, 2010 at 1:48 pm | Permalink

    Really nice n cool plugin.

  114. John
    Posted May 22, 2010 at 4:34 pm | Permalink

    Does this plugin work on the registration page? Thanks

  115. Jens
    Posted June 6, 2010 at 12:17 pm | Permalink

    Does this work? Seems like a nice easy way of geting around it

  116. Posted June 10, 2010 at 11:42 pm | Permalink

    I get ‘Invalid data. Please go back and try again.’
    Can you help? Thanks

  117. Angelica
    Posted June 13, 2010 at 6:12 am | Permalink

    It seems like a lot of people are attacking you. I think your idea is very good and I’m going to try it.

  118. Grahame Cooper
    Posted June 17, 2010 at 9:28 am | Permalink

    I have been using this excellent plug-in for about a year and it has been great. In the last month, though, I have found spam getting through.

    I don’t know whether this is the result of some new spamming tool appearing on the scene.

  119. Posted June 28, 2010 at 8:25 am | Permalink

    Solved it. There was a # between php and do in the line
    ID); ?> in my theme.
    I removed it and it works great. Thanks for a nice plugin.

  120. andy
    Posted June 30, 2010 at 4:03 am | Permalink

    Is this OK with WordPress 3.0? and…how come you use Clickcha on this form? Why not use your own plugin…?

  121. Guy Smith
    Posted July 6, 2010 at 7:28 am | Permalink

    This plug-in worked(works) great until recently. One spammer appears to have figured-out that a lot of WordPress sites have this, and have adjusted their algorithms to get past WP Captcha-Free (all the spams thus far are pitching low-cost loans).

    Might be good to provide some threshold adjustments or other tools to defeat this new threat.

  122. Posted July 9, 2010 at 7:21 am | Permalink

    I’ve installed it but it seems to me that this plugin doesn’t work along with my WP theme :(

  123. Healthy Living
    Posted July 10, 2010 at 10:19 pm | Permalink

    Yes, nice plugin. Really nice… :)

  124. Posted July 14, 2010 at 8:38 am | Permalink

    This is the best anti-spam plugin which I have ever used. So far it is working great. Previously I was using Akismet, I never liked captcha, and this plugin has added convenience both for me and the genuine visitors who comment. I hope it is not filtering the genuine comments.

    By the way, why on your own website you are using captcha?

  125. Graphic Designer
    Posted July 24, 2010 at 9:25 pm | Permalink

    This is a really nice plugin. Tried installing several others but they just weren’t good enough, and one was flash based which was a nightmare. Thank you so much for this.

  126. Posted July 26, 2010 at 8:54 am | Permalink

    You are a hero among men (and women). You are a star!
    Ironic that you are using a captcha system too, though! ;-)

  127. oversized chairs
    Posted July 27, 2010 at 1:22 am | Permalink

    I like the clickcha better. Very cleaver indeed. I wonder how the spammers will be able to crack this one.

  128. juicycouture
    Posted July 30, 2010 at 4:53 am | Permalink

    Grabbed the plugin and testing it on a new site now. Using the latest version of WP. SHall give you a shout should i run across any problems.Thanks a lot. Such a nice plugin.

  129. Sexycssweb
    Posted July 30, 2010 at 12:19 pm | Permalink

    Simply best plugin for me!

  130. Delfin
    Posted August 6, 2010 at 6:11 am | Permalink

    One of the finest plugin I ever seen. Thanks for sharing such a useful plugin.

  131. Tosu
    Posted August 7, 2010 at 5:49 pm | Permalink

    Hi there,

    Does it work with WP3.0.1?

  132. seolar
    Posted August 9, 2010 at 5:12 am | Permalink

    Very cool and useful plugin for wordpress. I like this one very much.
    Thanks for your hard work developing this extension.

    Please keep on developing those cool plugins!

  133. Art
    Posted August 12, 2010 at 9:32 pm | Permalink

    Nice plugin. It doesnt eliminate everything, but it does remove about 90% for me.

  134. Sharon
    Posted August 17, 2010 at 9:41 am | Permalink

    Getting the “Invalid data” error when submitting. I’ve left it up for now at my site above. The plugin is in my wp-content/plugins directory and is activated. Using word press 3.0.1 (just upgraded to this in hope of solving error). Also using template Atalpha 3.4.6 Thanks for any help you can provide.

  135. Neal Morgan
    Posted September 12, 2010 at 2:26 am | Permalink

    Love this plug-in. My new theme has only been up a few days and I was getting far to many comments to be realistic. Not wanting to put another level in the way of real people making comments on my posts i was reluctant to use a captcha. This is perfect, Many thanks :)

  136. Michelle
    Posted September 15, 2010 at 5:38 pm | Permalink

    Thanks for the great plug-in. You are so sweet!

  137. game boy
    Posted September 30, 2010 at 2:31 am | Permalink

    The plugin is good it eliminate about 95% of spam , it save me allot of time, one of the best captcha system available.

  138. Garf
    Posted October 4, 2010 at 3:33 pm | Permalink

    Firstly, thanks for making your plug-in available to bloggers. Been using for a few months but wondering how do I get to decide whether or not comments are spam?
    Stated using Akismet stats on one of my blogs that has wp-captcha and saw that in the last two months 120 comments had been identified as spam.
    Does wp-captch have something akin to a “spam folder” somewhere that I can check?
    Thanks

  139. incomen
    Posted October 7, 2010 at 8:20 am | Permalink

    I like the simplicity of this plugin. No setup, just install it and forget it. At least for me is working nice until now.

  140. Dmitriy
    Posted October 11, 2010 at 12:51 am | Permalink

    Just works, I’ve encountered 0 problems. Thanks!

  141. Steel Frame Buildings
    Posted October 21, 2010 at 12:58 pm | Permalink

    So far it is working great. Previously I was using Akismet, I never liked captcha, and this plugin has added convenience both for me and the genuine visitors who comment. I hope it is not filtering the genuine comments.

  142. sell timeshare
    Posted October 31, 2010 at 7:19 pm | Permalink

    Firstly, the comment: on line 86 of captcha-free.php you open a tag but never close it. Just thought I’d point that out.

  143. Social Care Training
    Posted November 9, 2010 at 3:53 am | Permalink

    It didn’t work for me. It came up with an error for me when I was writing a comment on a article about social care reform. :(

  144. MMO Tomb
    Posted November 21, 2010 at 2:03 am | Permalink

    I used your plug-in in my blog and it was working GREAT it was a god sent gift for me. But when I changed my theme I started to get Errors trying to post comments (but some people still can go through and post). I removed the plugin now, are you aware of such problem?

  145. Calling Cards
    Posted December 27, 2010 at 7:10 am | Permalink

    I appreciate all your work for creating the files to help prevent from spam. This type of button is helpful for the commenter to post their comment without any error.Thanks for the post.

  146. Kristen Simmons
    Posted December 29, 2010 at 9:00 am | Permalink

    Looks like an interesting option for controlling spam. I personally hate captchas. I have a hard time figuring them out myself and I consider myself computer savvy with perfect vision. Solutions that don’t use font you can barely read are appreciated.

  147. Shuaib
    Posted January 10, 2011 at 3:34 pm | Permalink

    Hi,

    Nice plugin. But I noticed lately it gives an “Invalid Data” error when submitting a valid comment. I had to disable it for now. Can you please look into this?

    Thanks and keep up the good work.

  148. chandrakant
    Posted January 23, 2011 at 6:05 am | Permalink

    Please keep on developing those cool plugins!

  149. M. Y.
    Posted February 11, 2011 at 11:40 pm | Permalink

    I am running Wordpress 3.0.5. Thanks for this wonderful Wordpress plug-in. Before I installed and activated your plug-in I was getting around 20-60 spam comments per day. It’s working so well. I haven’t gotten any spam comments at all, that’s ZERO, since I activated your plug-in. Thanks!

  150. Manu
    Posted February 14, 2011 at 7:09 am | Permalink

    Nice that such a facility has been created.

  151. Kristy
    Posted February 23, 2011 at 3:14 pm | Permalink

    Cool Plugin. Hope that this plugin can help me to get rid of spammers. Thanks.

  152. mona
    Posted February 24, 2011 at 12:38 pm | Permalink

    so you are not using it on this site ?
    :)

  153. Paul Furey
    Posted February 24, 2011 at 3:33 pm | Permalink

    The spamsters had found my blog – it was getting dangerous :)

    Then I found your plugin, installed smoothly – I do not understand how it works but hey…it works.

    But it looks like I got it just in time as my blog traffic sky rocketed (with those lowlife spamsters)and not one comment has got through.

    Many thanks for a great product.

  154. Haseena Butt
    Posted March 5, 2011 at 2:22 pm | Permalink

    Nice plugin. It doesnt eliminate everything, but it does remove about 90% for me

  155. Posted March 11, 2011 at 2:56 am | Permalink

    hi, I love your plugin and it works great. I have only 1 problem… after I click the “submit comment” button, it does nothing, after I click it again it works. So the button seems to require 2 clicks. With the plugin deactivated the “submit comment” button only requires 1 click to post the comment. Any thoughts? Again, great plugin!

  156. faruk
    Posted March 17, 2011 at 7:03 pm | Permalink

    It is the best anti-spam plugin which I have ever used. So it is working fine. Previously I was using Akismet, I never liked captcha, and this captcha has added convenience both for me and the genuine visitors who comment. I hope it is not filtering the genuine comments.Thanks a lot.

  157. Adrian
    Posted March 31, 2011 at 3:57 am | Permalink

    One of the best plugin so far. Thank you for the innovation.

  158. Paul Dauphin
    Posted April 3, 2011 at 9:34 am | Permalink

    I like the concept. I will try and report my experience.

  159. Posted April 11, 2011 at 1:09 pm | Permalink

    Great plugin, though I have a suggestion: Have it display a captcha for people without java (and telling them that captchas aren’t required if they have java enabled, or have a user account). That’s the best of both worlds — it just works for ~95% of users without any inconvenience, but remains accessible to the ~5% without java.

  160. Revathi
    Posted May 24, 2011 at 10:52 am | Permalink

    This is a very nice plugin I have been using.

    But after upgrading to Wordpress 3.1.2.this plugin shows “invalid Data” error. Can you please update this plugin for the latest version of Wordpress? Thanks much!

  161. Vikcon
    Posted June 2, 2011 at 12:29 am | Permalink

    Plugin is not available on WP plugins list.
    Please check

  162. Posted June 23, 2011 at 2:55 pm | Permalink

    Hi, I love this plugin, but why are all the download links down. Has it become a premium plugin? I am looking for the zip file.
    Regards
    D.D’Laine

  163. iDope
    Posted June 29, 2011 at 3:39 am | Permalink

    Please try again. It is up now.

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