10+ Best Anti-Spam Plugins for WordPress 2015

Combating WordPress comment spam is an ongoing process and can be done with (a) the help of plugins or (b) with a little bit of tweaking the discussion settings in WordPress. In this tutorial, we focus on both methods. The 2 factors you should consider while deciding your next anti-spam plugin should be:

  1. Amount of traffic
  2. Number of comments

If both the numbers are on the lower end (for example, when you’re starting off a blog), you can go for technique (b), i.e. tweaking WordPress settings to manually prevent spam. It’s quite interesting to see just how much WordPress has to offer.

In part (a), i.e. preventing spam using WordPress antispam plugins, we first take a look at the important features an antispam plugin should have. Then we dive into the plugin list.

Essential Features of a WordPress Antispam Plugin

There is lots you could look for in an antispam plugin, but there are a handful of key features that you really must consider. Let’s take a look!

1. Zero Client Side Actions

Client side actions, other than writing the comment, should be kept as low as possible – ideally zero. Your plugin should not ask your genuine commentator to check/uncheck a checkbox or type in an unintelligible captcha image. Entering captcha for comments significantly hampers the user experience and should be avoided.

2. Minimal WordPress Database Impact

Nip it at the bud

A good anti-spam plugin should not allow the spam comment to be entered into the WordPress database. As a result, the number of SQL transactions decrease, which means lower server load, i.e. improved performance – even during peak traffic hours. This risk here though, is if the antispam algorithm goes wrong, a genuine comment can be lost forever (oops).

3. Block New User Registration Spam

The WordPress registration page allows users to register on your website. The registration process is pretty straight forward and can be easily automated by bots.

Why Do We Need To Stop It? Once registered, a user can post as many comments as he pleases, without being filtered. This is the normal Discussion setting in a new installation of WordPress. Therefore, you can either change the default settings, or use a plugin like WP-SpamShield that blocks new user registration spam.

4. Trackback Validation

Trackback Validation consists of a filter that compares the client IP address of the incoming trackback against the IP address of the server. If both of them don’t match, then it is spam.

5. Statistics

Statistics help in tracking and analysis of data. The plugin should provide weekly or monthly statistics of detected spam.

6. Cost

As with many plugins, some are free and some are paid. Some of the plugins, including Antispam Bee & WP-SpamShield Anti-Spam, are free. Other solutions, such as Akismet and CloudTalk, are paid options for commercial and business websites.

List of the Best WordPress Antispam Plugins

1. Akismet

akismet

The number one WordPress antispam plugin in the repository, developed by the Automattic team – Akismet brings enterprise level spam protection to your WordPress site. With Akismet, the user installs and activates plugin using an API key (signup required). Plugin works by uploading all incoming comments to the Akismet server. Comments then undergo hundreds* of antispam algorithms (* we really don’t know the exact number). Correct comments are published, while the rest are thrashed to the spam queue.

Notes:

  • Akismet is free for non-profit and personal use (up to 50,000 monthly spam checks)
  • Commercial licenses start at $5/month
  • Compatible with top WordPress plugins such as Jetpack and Contact Form 7
  • View every comment’s status history to see which were spammed by a moderator, or put in the spam folder automatically

2. Anti-Spam Bee

antispam-bee-hero

The next best choice after Akismet would be Anti-Spam Bee. This free plugin is full of great features, and doesn’t require registration like Akismet does. Anti-Spam Bee is free for personal and commercial use, so no matter your website you can be spam free.

Notes:

  • Block comments from specific IP addresses, countries or with different language
  • Logs spammers using Fail2Ban
  • Clear WordPress database of spam after a specified number of days (spam purging)
  • Displays monthly statistics on the dashboard with spam numbers

antispam-bee-options-

Advanced anti-spam configuration measures of Anti-Spam Bee

3. WP-SpamShield Anti-Spam

wp-spamshield

WP-SpamShield Anti-Spam handles comment spam, registration spam, trackback spam and contact form spam. That’s a lot of spam! The plugin does not allow spam to enter the WordPress database using a multitude of methods, one being an advanced comment logging and blacklisting features which helps block persistent spammers. And with WP-SpamShield Anti-Spam you can also block comments for visitors using a proxy server

2 Layers Of Protection:

  • The JavaScript/Cookies Anti-spam Layer which blocks all automated spam bots
  • The Algorithmic Anti-spam Layer contains 100+ algorithmic filters to block human and trackback spam

Plugin Compatibility:

  • Comment form plugins like Contact Form 7, Gravity Forms, Ninja Forms, and JetPack
  • Social plugins like BuddyPress and bbPress
  • E-commerce plugins like WooCommerce
  • Membership plugins like s2Member and WP-Members

4. WordPress Zero Spam

wp zero spam

Based on a concept by Mozilla developer David Walsh, the WordPress Zero Spam Plugin uses server and client side JavaScript key validation to prevent bots from spamming. Essentially, users cannot comment without JavaScript enabled.

Notes:

  • No external services/servers required for anti-spam checking
  • Does not guard against human spammers
  • Free for both personal and commercial use

5. CleanTalk

cleantalk-header

CleanTalk is a premium cloud-based antispam plugin for WordPress which blocks spam comments, spam bot signups and trackbacks. With CleanTalk, comments are uploaded to CleanTalks’ cloud servers wherein it undergoes multiple validation checks. These checks include – comment submitted too quickly, JavaScript disabled, blacklisted HTTP links and many more. Valid comments are then allowed, while the rest are sent to the spam queue.

cleantalk-settings

Anti-spam settings for CleanTalk

Notes:

  • CleanTalk offers a 14 day free trial, after which a commercial license costs $8/year for a single website
  • Advanced statistics displaying spam block/moderation
  • Spam comment log which shows the reason for blocking comments

antispam-cleantalk-statistics

Spam blocking statistics

Plugin Compatibility:

  • Comment form plugins like Formidable Forms, Contact Form 7, Fast Secure Contact, and JetPack
  • Social plugins like BuddyPress and bbPress
  • E-commerce plugins like WooCommerce
  • Membership plugins like s2Member and WP-Members
  • Cache plugins like W3 Total Cache and WP Super cache

6. Growmap Anti Spambot Plugin

gasp-header

Growmap Anit Spambot (GASP) is another free plugin option, which adds a client-side generated checkbox to the comment box asking users to confirm that they are not a spammer. You can set the maximum amount of comments a user can have to help limit spammers trying to post to your site. So GASP essentially stops spam bots by adding dynamically generated named fields to comment form.

7. GoodBye Captcha

goodbye-captcha

GoodBy Captcha eliminates spam-bot signups, spam comments and brute force attacks by preventing the spam comments from entering the WordPress database. The plugin applies antispam measures in signup pages as well as login and password reset pages to stop spam before it starts.

Plugin Compatibility:

  • Comment form plugins like PlanSo Forms, JetPack, Postmatic, Epoch and MailChimp for WordPress
  • Membership plugins like Ultimate Member
  • Login plugins like WP User Control and Login With Ajax

8. WangGuard

wangguard

WangGuard is a WordPress MU, BuddyPress and bbPress compatible anitspam plugin. It follows Akismet and CleanTalk procedure by checking comments for spam on external servers. The API connection is even encrypted with SSL for added security.

9. Spam Destroyer

spam destroyer

Spam Destroyer was designed to be as unobtrusive to your readers as possible. This lightweight plugin stop automated spam without putting off your commentors, and is something you might consider for a small blog or low traffic website.

10. Stop Spam Comments

stop spam comments

Stop Spam Comments is a simple JavaScript-based spam comment blocker for WordPress. Just activate this nearly invisible plugin to start stopping spam dead in its tracks. The nice part about this plugin is that it doesn’t add captchas, questions or other interactions for users to stumble over.

11. Stop Spammers Spam Prevention

Stop Spammers Spam Prevention

Stop Spammers Spam Prevention helps to prevent comment spam, as well as limits login attempts. The plugin utilizes over 20 different checks for spam and malicious events to detect spam. When the plugin flags a comment or login attempt, users are allowed a second attempt via a denied request page. Here users are presented with a captcha screen in order to prevent them from being blocked. The Captcha can range from OpenCaptcha, Google reCaptcha, or SolveMedia Captcha.

How to Leverage WordPress Discussion Settings to Prevent Spam

The settings for controlling comments in WordPress is available under Settings > Discussions. Please note that this is the manual method of preventing/combating spam and is usually the most effective when you have a few comments every day. However, if you have over 1000 daily comments, it is more feasible to use an antispam plugin.

Let’s discuss certain ways to use these default WordPress settings to prevent spam. We will discuss one section at a time.

1. Default Article Settings

manual-anitspam-01-default article settings

Screenshot of the recommended Default Article Settings

Simply disable trackbacks and pingbacks to save yourself from half the spam traffic. Only allow people to post comments on new articles.

2. Other Comment Settings

manual-anitspam-02-other comment settings

Screenshot of the recommended Other Comment Settings

It is almost always necessary for the comment author to enter his name/email before commenting. WordPress enables this by default. If you require users to log in before leaving comments then this will cut down on a significant amount of spam This step might be a turn off for few legit readers who want to leave a comment but don’t want to sign in. Therefore you must carefully analyze before enabling this feature.

You should disable comments on posts older than 90 days in a fairly active blog. However, if you keep updating articles, make sure to change the published date so that the 90 days boundary doesn’t overlap. Keep Threaded comments to the default or increase it if required.

3. E-mail Me Whenever

manual-anitspam-03-email me whenever

Screenshot of the recommended E-mail Me Whenever Settings

You can use this feature if you don’t get thousands of comments on your posts. You will get email notifications for every comment that pops up and you can mark it spam right away cutting down on a section of spam comments.

4. Before a Comment Appears

manual-anitspam-04-before a comment appears

Screenshot of the recommended Before a Comment Appears Settings

Allowing readers who have previously left a comment, to leave a comment again without requiring any approval, will help you cut down the legit comments in the moderation queue. You’ll only have to focus on the remainder of users, mostly of which will be spam.

5. Comment Moderation

manual-anitspam-05-comment moderation

Screenshot of the recommended Comment Moderation Settings

I suggest you use a value of 2. This ideally allows guest bloggers to leave at most one outgoing link (link bait) in their comment. Building an effective comment moderation blacklist is a very time-consuming process, with equally beneficial payoffs. However, you can leverage this setting as an effective profanity filter. Simply add the profane words to the list and all such comments will be added to the moderation queue.

7. Comment Blacklist

manual-anitspam-06-comment blacklist

Screenshot of the recommended Comment Blacklist Settings

Comment Blacklist is stricter version of the Comment Moderation Blacklist, where if a comment contains a blacklisted word, it is sent to the spam queue, instead of the moderation queue. The benefit – saves your time.

Conclusion

We covered a lot in this post, and hopefully you’ll find some of it useful in your spam blocking efforts. What’s your favourite way of combating spam? Do you know of an awesome antispam plugin we haven’t listed? Let us know in the comments section below!

Sourav
Post Author: Sourav

Sourav is a WordPress enthusiast, an avid gamer and a sitcom collector. His playlists include heavy metal, electronic, and new-age tracks. When he's not online, he's spending quality time with his friends and family. You can follow him on Twitter.

Disclosure: This page contains external affiliate links that may result in us receiving a comission if you choose to purchase said product. The opinions on this page are our own. We do not receive payment for positive reviews.
Got something to say? Join the discussion.
  1. pradeep says:
    i am using GASP from past few months and this is really useful plugins when it come to stop spammers spoil your blog.. but now i will surely try few more from your list.. thanks, Saurav
  2. stk says:
    Great listiing, which is true for outside of Germany/Europe. Acc. to our laws Akismet has a privacy issue which leverages AntiSpamBee on No. 1! Anyone who is keen on privacy policy should have a closer look to AntiSpamBee as alternative to Akismet.
  3. Kaleb says:
    @Sourav, Thanks for this great list. It’s been 4 days since I installed GoodbyeCaptcha and it has stopped 100% of the 874 comment spam attempts on my web site. I am so impressed with this plugin. ZERO spam comments got past GoodbyeCaptcha. Thanks again for this post
    • Sourav says:
      Sourav
      Hi Kaleb, thanks for the feedback! Glad to hear that Goodbye Captcha is working so well for you.
      Author
  4. Vince says:
    I've used Akismet with all of my blogs and it really works wonders. I'll certainly try out some of this anti-spam plugins when I get a new one. Thanks for this list.
  5. aleks says:
    I'm using CleanTalk more than 3 years and I didn't have spam. It's great when a have statistics about all my comments/registration
  6. dubestate says:
    I'm using CleanTalk in trail period its a nice spam plugin. but unfortunately when i want to upgrade my membership then they offer me 8$ but when i open payment form then they show me to pay 16 dollars. Its a fake company. and cheating with his clients.
  7. El Taller Del Bit says:
    Hello, i discovered WP Spamshield last year and since then i use it. I love the functionallitys of this plugin, but recently i discovered that the plugin uses a lot of memory and causes error 500 on my server. What other plugin would you use? I need an automatic plugin that doesn´t use human captcha and that applies to all forms (like register, login...), just like WP SPAMSHIELD does. I think Akismet is not a good solution because it proved to me that a lot of SPAM obtain access to be published (at least i tested it in a forum website with BBPRESS plugin and i had to clean manually all spam entries....more than 100.000 ..) What do you all think about WP SPAMSHIELD memory consumption? Alternatives please?
  8. Rudy says:
    thanks, i am very tired in one day i got 12 post spam in my website. this is give me idea, what the best for my website. i will try antispam bee thanks bro
  9. Biztech Store says:
    Thanks for sharing this great post. What do you think about that facebook comment will increase comment ratio?
    • AJ Clarke says:
      AJ Clarke
      That really depends on your visitors/niche. Some example if your target audience is people between the ages of 13-18 then Facebook comments may work better then if your target audience is between 50-60 years old. You can always try it out for a bit and see how it works and if it's a good fit for your site.
      Admin
  10. Munna Hossain says:
    This is an excellent list. All the plugins here are really good. You can use any of the plugins after your own choice. Akismet is the best and most popular anti-spam plugin. It is also my favorite anti-spam plugin and I am using this plugin on my WordPress blog. WordPress zero spam is also an active and perfect protection plugin. We must use an anti-spam plugin on our blogs/websites so that we will be safe from spamming. Thanks for your really interesting article.
  11. Sam says:
    Thanks a lot for great information. I will try Akismet plugin and I am sure it will work fine on my website. Thanks again for helping me.

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