Neutrope Inc.

Neutrope Quiet Shield adds lightweight spam and unsolicited-sales filtering to 
Contact Form 7 submissions. The idea is simple: let spam and cold sales 
mail be received quietly without disturbing the people running the site.
Each submission is scored against a small set of checks you control:
<ul>
<li>Japanese character ratio: flag messages with too little Japanese text.</li>
<li>URL limit: flag messages that contain more links than you allow.</li>
<li>Submission speed: flag forms submitted suspiciously fast after they were 
shown. The timing value is signed so it cannot be tampered with.</li>
<li>Repeat submissions: flag three or more submissions from the same visitor 
within five minutes.</li>
<li>NG words: flag messages containing any keyword from your own list.</li>
</ul>
When a submission is flagged you choose what happens with Quiet Mode:
<ul>
<li>Quiet Mode on (default): the visitor sees the normal success message, but 
no mail is sent. The reason is written to the log.</li>
<li>Quiet Mode off: the submission is stopped with the standard Contact Form 
7 error message.</li>
</ul>
The plugin is deliberately small. It makes no external network requests, 
creates no database tables, and shows no ads or upsells. Configuration is 
stored in a single option, and the log keeps only decision metadata plus a 
short, salted IP hash. Message bodies, e-mail addresses and names are never 
stored.
If Contact Form 7 is not active, the plugin still activates safely and 
shows an admin notice instead of causing an error.
This plugin is an independent add-on and is not affiliated with or endorsed 
by the authors of Contact Form 7.
<h3>Features</h3>
<ul>
<li>Five independent checks, each configurable from one settings page.</li>
<li>Quiet Mode to silently drop flagged mail or stop it with an error.</li>
<li>Dashboard with today’s passed and blocked counts and a recent activity 
log.</li>
<li>Tamper-evident submission-speed measurement using a signed field.</li>
<li>IP addresses are hashed, never stored in raw form.</li>
<li>No external requests, no tracking, no database tables, no ads.</li>
<li>GPL-2.0-or-later. The full license text is bundled in the LICENSE file.</li>
</ul>
<h3>License</h3>
This plugin is licensed under the GPL-2.0-or-later. The full license text 
is included in the bundled LICENSE file. 
License URI: https://www.gnu.org/licenses/gpl-2.0.html

Neutrope Quiet Shield

Quietly deflect spam and unsolicited sales messages sent through Contact Form 7. Lightweight, no external calls, no stored personal data.

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.

Neutrope Quiet Shield vs SpamJam