shawfactor

Why should your users prove that they’re humans by filling out captchas? Let bots prove they’re not bots with the <a href="http://lhero.org/plugins/lh-zero-spam/" rel="nofollow ugc">LH Zero Spam plugin</a>.
LH Zero Spam blocks registration spam and spam in comments automatically without any config or setup. Zero Spam was initially built based on the work by <a href="http://davidwalsh.name/wordpress-comment-spam" rel="nofollow ugc">David Walsh</a>, but enhanced with simpler code base and unobtrusive JavaScript.
Major features in LH Zero Spam include:
<ul>
<li>No captcha, because spam is not users’ problem</li>
<li>No moderation queues, because spam is not administrators’ problem</li>
<li>Blocks spam registrations & comments with the use of JavaScript</li>
<li>Blocks buddypress spam registrations with the use of JavaScript</li>
<li>Blocks woocommerce spam orders with the use of JavaScript</li>
</ul>
Like this plugin? Please consider <a href="https://wordpress.org/support/view/plugin-reviews/lh-zero-spam/" rel="ugc">leaving a 5-star review</a>.
Love this plugin or want to help the LocalHero Project? Please consider <a href="https://lhero.org/portfolio/lh-zero-spam/" rel="nofollow ugc">making a donation</a>.

LH Zero Spam

The plugin itself works perfectly and if you like lightweight unobtrusive solutions it is the way to go



Ben Marshalls commenty is unhelpful

Zero Spam makes blocking spam comments and registrations easy.

Freemius

Matt Biscay

Tired of deleting spam comments every day? SpamJam is a lightweight, invisible anti-spam solution that blocks automated spam before it hits your database—without annoying your legitimate users with captchas or verification steps.
<h4>Why SpamJam?</h4>
Unlike traditional anti-spam plugins that rely on third-party services or frustrating captchas, SpamJam uses intelligent honeypot techniques and behavioral analysis to silently eliminate spam bots. Your real visitors won’t see any difference, but spam bots will be stopped cold.
<h4>Free Features</h4>
✅ Honeypot Protection – Invisible fields that trap spam bots 
✅ Referrer Validation – Blocks direct form submissions 
✅ Nonce Security – CSRF protection for all comment forms 
✅ Smart Blocklist – Filters common spam keywords 
✅ Zero Configuration – Works immediately after activation 
✅ No Captchas – Never annoy your real users 
✅ Lightweight – Minimal impact on site performance 
✅ WooCommerce Compatible – Works with HPOS
<h4>Pro Features (Premium)</h4>
🚀 Registration Spam Protection – Protect user registration forms with email verification 
🚀 Premium Blocklist – Auto-updating list of 15,000+ spam terms 
🚀 Custom Blocklist – Add your own keywords and patterns to block 
🚀 Geographic Blocking – Block comments from specific countries 
🚀 IP Blocking – Block specific IP addresses or ranges 
🚀 Rate Limiting – Prevent spam floods with configurable limits 
🚀 Email Whitelist – Always allow trusted email addresses 
🚀 Spam Logging & Analytics – Track and analyze blocked spam attempts 
🚀 Content Validation – Set minimum comment length and maximum links 
🚀 Contact Form Protection – Protect Contact Form 7, WPForms, Gravity Forms 
🚀 User Enumeration Blocking – Enhanced security against attacks 
🚀 Priority Support – Get help when you need it
<a href="https://utopique.net/products/spamjam/" rel="nofollow ugc">Upgrade to SpamJam Pro →</a>
<h4>Perfect For</h4>
<ul>
<li>Blogs with active comment sections</li>
<li>Membership sites</li>
<li>WooCommerce stores</li>
<li>Community websites</li>
<li>Any WordPress site tired of spam</li>
</ul>
<h4>How It Works</h4>
SpamJam uses multiple layers of protection:
<ol>
<li>Honeypot Fields – Hidden form fields that only bots fill out</li>
<li>JavaScript Validation – Ensures forms are submitted by real browsers</li>
<li>Referrer Checking – Verifies submissions come from your site</li>
<li>Hash Validation – Cryptographic verification of form integrity</li>
<li>Keyword Filtering – Blocks known spam patterns</li>
</ol>
All of this happens invisibly in the background. Your legitimate users never see a captcha or verification step.
<h4>Privacy First</h4>
SpamJam doesn’t send your data to third-party services. Everything happens on your server, keeping your users’ information private and your site GDPR-compliant.

SpamJam

Stop 99% of spam comments and registrations automatically. Zero captchas, zero hassle. Your visitors won't even notice it's there.

LH Zero Spam vs SpamJam