ohtan

<h3>■バージョン2.1.0以前は下記にあります</h3>
http://cmf.ohtanz.com/spam-bye2.html
<h3>■特徴</h3>
日本語に特化して他言語圏spamを高確率で排除します
<ul>
<li>1.ひらがなが含まれていない</li>
<li>2.日本語(2バイト以上の文字)が含まれていない</li>
<li>3.1行の文字数がN文字を超えている</li>
<li>4.連続した改行の合計がN個を超えている</li>
<li>5.URLが含まれている</li>
<li>6.NGワードが含まれている</li>
<li>7.URLがURIBLデータベースに登録されている</li>
<li>
8.投稿者のIPがDNSBLデータベースに登録されている
</li>
<li>
チェック項目を順位付けられ早期に判別した場合残りの検査をしない為、処理が早く終わります
</li>
<li>1、2は日本語投稿で必ず出現する文字</li>
<li>3はspamはあまり改行せずに投稿することがあるため</li>
<li>4は他者の投稿を読ませない等の妨害で改行を多用するため</li>
<li>5はURLの誘導</li>
<li>6は禁止語句</li>
<li>7、8は公平外部登録ブラックリスト照会</li>
<li>6、7、8は処理に時間が掛かる為、検査の順位は下位を推奨</li>
<li>6、7、8は検査項目が多いとタイムアウトする可能性があるため簡易検査程度に留めてください</li>
</ul>
<h3>Arbitrary section</h3>
<h4>■See also(DNSBL/URIBL)</h4>
<ul>
<li>Barracuda Reputation Block List(b.barracudacentral.org)</li>
</ul>
<blockquote>
http://www.barracudacentral.org/rbl
</blockquote>
<ul>
<li>RBL.JP(url.rbl.jp/dyndns.rbl.jp/notop.rbl.jp)</li>
</ul>
<blockquote>
http://www.rbl.jp/allrbl.html
</blockquote>
<ul>
<li>SURBL(multi.surbl.org)</li>
</ul>
<blockquote>
http://www.surbl.org/
</blockquote>
<ul>
<li>URIBL(multi.uribl.com)</li>
</ul>
<blockquote>
http://www.uribl.com/
</blockquote>

spam-byebye

コメントスパム対策用プラグイン(SPAM-BYEBYE)

OOPSpam Team

<a href="https://www.oopspam.com/" rel="nofollow ugc">OOPSpam</a> is a modern anti-spam solution that uses advanced AI and machine learning to protect your WordPress forms and comments from spam. Our system has blocked over 1 billion spam attempts across 3.5M+ websites, maintaining 99.9% accuracy without compromising user privacy or accessibility.
Unlike traditional CAPTCHA solutions that can hurt your conversion rates, OOPSpam works silently in the background, analyzing submissions against our extensive database of 500M+ malicious IPs and emails to catch both bot and human spammers.
<h3>Why Choose OOPSpam?</h3>
🚀 Zero Impact on User Experience 
– No CAPTCHA puzzles or challenges that hurt conversions 
– Works silently in the background without JavaScript or tracking 
– Maintains fast website performance with server-side processing
🛡️ Intelligent Spam Prevention 
– Catch 99.9% of spam using advanced machine learning and contextual analysis 
– Protect against both automated bots and human spammers 
– Auto-detect spam patterns unique to your website’s context 
– Block spam from VPNs and known malicious sources 
– Prevent WooCommerce card testing attacks with advanced checkout protection
🔒 Privacy-First Design 
– GDPR-compliant with no data stored on our servers 
– Optional IP and email analysis for maximum privacy 
– All logs stored in your WordPress database 
– Remove sensitive information from messages automatically
🌍 Smart Geographic Controls 
– Target your relevant market by blocking specific countries 
– Filter submissions by language to focus on your audience 
– Prevent fraud and abuse from high-risk regions
⚙️ Powerful Management Tools 
– View and manage spam entries with detailed detection reasons 
– Export data for analysis or reporting 
– Rate limiting to prevent abuse and click fraud 
– Manual override options for complete control
🏢 Perfect for Agencies 
– Use one API key across unlimited websites 
– Centralized logging option in OOPSpam dashboard 
– Consistent protection across all your client sites
<h3>What Our Users Say</h3>
<blockquote>
“It’s eliminated all spam, and even the need for CAPTCHA. Setup is quick and the interface is intuitive.” – @gotmick
“Very responsive support and dev team. Customer support was amazing, response time was immediate and issues were solved instantly.” – @viv18germany
“Pricing is perfect for agencies as they do tiers by actual # of API calls and no limit on the number of sites you can install this on.” – @squarecandy
</blockquote>
<h3>By the Numbers</h3>
<ul>
<li>3.5M+ websites protected daily</li>
<li>1B+ spam attempts blocked</li>
<li>99.9% detection accuracy</li>
<li>24/7 customer support</li>
<li>500M+ malicious IPs and emails in our database</li>
</ul>
<h3>Supported form & comment solutions:</h3>
<ul>
<li>WooCommerce Order & Registration</li>
<li>BuddyPress</li>
<li>Elementor Forms</li>
<li>Ninja Forms</li>
<li>Gravity Forms</li>
<li>Kadence Form Block and Form (Adv) Block</li>
<li>Fluent Forms</li>
<li>Breakdance Forms</li>
<li>WS Form</li>
<li>WPDiscuz</li>
<li>Forminator</li>
<li>WPForms</li>
<li>Formidable Forms</li>
<li>Contact Form 7</li>
<li>Bricks Forms</li>
<li>Toolset Forms</li>
<li>Piotnet Forms </li>
<li>GiveWP Donation Forms</li>
<li>MailPoet</li>
<li>Beaver Builder Contact Form</li>
<li>Ultimate Member</li>
<li>MemberPress</li>
<li>Paid Memberships Pro</li>
<li>Jetpack Forms</li>
<li>MC4WP: Mailchimp for WordPress</li>
<li>SureForms</li>
<li>SureCart</li>
<li>QuForm</li>
<li>HappyForms Pro</li>
<li>Avada Forms</li>
<li>MetForm</li>
<li>ACF Frontend Forms</li>
<li>Newsletters by Tribulant</li>
</ul>
OOPSpam Anti-Spam WordPress plugin requires minimal configuration. Check out our <a href="https://help.oopspam.com/wordpress/" rel="nofollow ugc">comprehensive WordPress guide</a> for detailed setup instructions. To get started quickly, <a href="https://app.oopspam.com/Identity/Account/Register" rel="nofollow ugc">get a key</a> and paste it into the appropriate setting field under Settings=>OOPSpam Anti-Spam. If you have a contact form plugin, make sure you enable spam protection on the settings page.
Please note: This is a premium plugin. You need an <a href="https://app.oopspam.com/Identity/Account/Register" rel="nofollow ugc">OOPSpam Anti-Spam API key</a> to use the plugin. Each account comes with 40 free spam checks per month. 
If you already use OOPSpam on other platforms, you can use the same API key for this plugin.

OOPSpam Anti-Spam: Spam Protection for WordPress Forms & Comments (No CAPTCHA)

This is a great plugin with a very responsive and knowledgable support team.

I emailed them yesterday with a kind of obscure WooCommerce feature request and they had a fix deployed within 12 hours.

Yes, it's a paid service if your site has any kind of volume at all, but it's extremely effective and fully built for privacy and GDPR compliant. We're trying to de-G00glify everything for our clients so their websites are not tracking users every move and implementing this service is part of our (slow and tedious) move in that direction. 

Pricing is perfect for agencies as they do tiers by actual # of API calls and no limit on the number of sites you can install this on. Most competitors we were looking at had per-site license structures that were not going to work for us.

Works well for default comment fields, WPForms and WooCommerce. Has some other integrations but those are the ones we tried.

If you have any doubts, just go back into your logs of spam that slipped through reCAPTCHA and Akismet and a honeypot... pick a message and enter the data on the app.oopspam.com dashboard you can edit the test data right there and it will show you what spam score their system would give that message.

Great Service

Protect your forms from spam with 99.9% accuracy - no CAPTCHA, no JavaScript, no tracking. Trusted by 3.5M+ websites.

spam-byebye vs OOPSpam Anti-Spam: Spam Protection for WordPress Forms & Comments (No CAPTCHA)