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NoCaptcha Spam Filter for Contact Form 7 provides a deterministic, cache-safe, multi-layered defense against automated form submissions for Contact Form 7 without the need for CAPTCHAs or external libraries.
The plugin uses a combination of:
<ul>
<li>Unique Honeypot: A site-specific hidden field that traps bots.</li>
<li>Cryptographic Signing: Ensures form tokens are genuine and haven’t been tampered with.</li>
<li>Anti-Replay Nonces: Each submission is unique; tokens cannot be reused.</li>
<li>Time-Check Validation: Blocks bots that fill out forms faster than humanly possible.</li>
<li>Cache-Safe Architecture: Automatically detects stale tokens on cached pages and refreshes them via a lightweight REST API fallback.</li>
</ul>
<h3>Scope of Protection</h3>
This plugin is designed to block the vast majority of automated spam submissions (99% of common web crawlers) in Contact Form 7, with zero impact on user experience or performance. However, please note:
<ul>
<li>Not a WAF: It is not a substitute for a Web Application Firewall or server-level security layers for mitigating sophisticated DDoS attacks.</li>
<li>Targeted Attacks: Highly sophisticated bots using headless browsers or manual human bypasses (spam farms) fall outside the scope of lightweight algorithmic protection.</li>
</ul>
For maximum security, we recommend using this plugin as part of a multi-layered defense strategy.
<h3>Configuration (optional, only for advanced users)</h3>
You can override defaults in ‘wp-config.php’: 
 <code>php 
define('CF7NCSP_DOMAIN_SALT', 'your-random-string'); 
define('CF7NCSP_TTL', 2400); // Token lifetime (seconds) 
define('CF7NCSP_MIN_TIME', 20); // Minimum time before submission</code> 
Recommendations 
* Use a long, random string for ‘CF7NCSP_DOMAIN_SALT’ 
* Keep ‘CF7NCSP_MIN_TIME’ between 10–30 seconds
<h3>Privacy Policy</h3>
This plugin is designed with privacy-first principles: 
* No PII Collection: It does not collect, store, or transmit any Personally Identifiable Information (PII). 
* No Persistent IP Storage: IP addresses are used transiently for rate limiting and are not stored in plain form or retained beyond a short-lived, temporary cache. 
* Local Processing: All validation happens on your server. No data is sent to third-party services. 
* Cookieless: The plugin does not set any browser cookies.
<h3>Disclaimer</h3>
This plugin is provided “as is”, without warranty of any kind, express or implied. Use at your own risk. While best efforts have been made to ensure reliability and security, the author is not liable for any damages or losses resulting from its use.
** DEVELOPER’S NOTE: **
This plugin is designed to be a lightweight, “set and forget” solution. It focuses on stability and minimal maintenance, with updates provided as needed for bug fixes and compatibility with WordPress and Contact Form 7. Because it is built to be self-sufficient, please be aware that the developer will not implement non-critical feature requests.

NoCaptcha Spam Filter for Contact Form 7

Honeypot, signed security tokens, and anti-replay protection for Contact Form 7. Built for performance and full-page cache compatibility.

fullworks

Is Contact Form 7 spam destroying your mornings?
No API key. No data leaving your server. No charges for commercial use. Just effective spam protection that works the moment you activate it.
<h4>What Gets Protected (FREE)</h4>
✅ Contact Form 7 – Block bot spam automatically 
✅ WPForms Lite & Pro – Stop automated submissions 
✅ Jetpack Contact Forms – Filter bot spam instantly 
✅ Fluent Forms – Eliminate bot attacks 
✅ SureForms – Block bot spam submissions 
✅ WordPress Comments – Clean comment spam from badbots 
✅ Business sites included – No commercial fees ever
Works immediately after activation. No configuration. No learning curve. No monthly costs.
<h4>How It Works</h4>
3 Steps to Spam-Free Contact Forms:
<ol>
<li>Install – Search “Contact Form 7 spam” in your WordPress dashboard</li>
<li>Activate – One click to turn on protection</li>
<li>Relax – Your Contact Form 7 and WPForms and others are now protected from bots</li>
</ol>
The moment you activate, spam bots are automatically blocked on all your forms and comments. No settings to configure. No technical knowledge required. No ongoing maintenance.
Most users report 95-100% spam reduction within the first 24 hours.
Tomorrow morning, check your inbox. Instead of dozens of spam submissions, you’ll see only real customer inquiries. That’s the peace of mind this plugin delivers.
<h4>Why Contact Form 7 Needs This</h4>
Contact Form 7 is WordPress’s most popular form plugin with over 5 million active installations. It’s lightweight, flexible, and completely free.
But it doesn’t include spam protection.
Without protection, Contact Form 7 sites get hammered. Bot networks discover unprotected forms and flood them with submissions. Your inbox fills with junk. You waste time sorting real inquiries from spam. Worse, you risk missing legitimate customers buried in the noise.
This plugin fixes that problem. For free. Forever.
<h4>Free vs Pro: What You Get</h4>
FREE Version (Most Sites Need Only This): 
✅ Contact Form 7 bot spam blocked 
✅ WPForms automated spam stopped 
✅ Jetpack forms protected 
✅ Fluent Forms secured 
✅ SureForms protected 
✅ WordPress comment spam eliminated 
✅ Works on business/commercial sites 
✅ Spam statistics dashboard
Automated bots cause 95%+ of spam. The free version handles this completely.
PRO Version (For Advanced Needs): 
⚡ Private Machine Learning human spam detection (runs on your own server, learns from your spam) 
⚡ Gravity Forms integration 
⚡ WooCommerce registration protection 
⚡ Email quarantine for review 
⚡ Custom IP blocklists 
⚡ Allow/deny pattern rules 
⚡ Priority support
Most Contact Form 7 users never need Pro. But if you’re getting manually-typed spam or need enterprise features, Pro has you covered.
<h4>Why This Works Better Than CAPTCHA</h4>
CAPTCHA makes your visitors prove they’re human by solving puzzles. It’s annoying, hurts conversions, and still lets some spam through.
This plugin takes a smarter approach:
<ul>
<li>Invisible honeypot fields – Bots can’t resist filling hidden fields that humans never see</li>
<li>Timing analysis – Bots submit forms instantly; real people don’t</li>
<li>Behavioral fingerprinting – Bot patterns are detectable and consistent</li>
<li>No user friction – Your visitors never know the protection exists</li>
<li>Lightning fast – All processing happens locally on your server</li>
</ul>
Your Contact Form 7 stays fast. Your conversion rates stay high. Spam disappears.
It just works. Quietly. Effectively. Completely free.
<h4>Common Questions Answered</h4>
“Will this work with my existing Contact Form 7 setup?” 
Yes. It integrates automatically with all CF7 configurations, custom fields, and extensions. Nothing breaks. Spam just stops.
“I’m not technical. Can I install this?” 
If you can install a WordPress plugin, you can use this. There’s literally nothing to configure. Install, activate, done.
“What about sites that aren’t in English?” 
Works perfectly on all languages. The spam detection doesn’t depend on language – it detects bot behavior patterns.
“My site sells products. Do I have to pay?” 
No. Unlike some popular anti-spam solutions that charge business sites, this is free for commercial use. No exceptions. No hidden fees.
<h4>Ready to Stop Contact Form 7 Spam?</h4>
Installation takes 30 seconds:
<ol>
<li>In your WordPress dashboard, go to Plugins → Add New</li>
<li>Search for “Contact Form 7 spam”</li>
<li>Click Install, then Activate</li>
<li>Done – your forms are now protected</li>
</ol>
Check your email tomorrow. Enjoy the silence.
For detailed statistics and settings, visit Settings → Anti Spam after activation.
<h3>Go Pro</h3>
Most Contact Form 7 users never need Pro – the free version eliminates their spam problem completely.
What makes Pro unique – private Machine Learning: Unlike cloud filters that ship your visitors’ messages off to an external service, the Pro classifier runs entirely on your own server. It learns from the spam you classify, gets smarter the more you use it, and never sends data to a third party outside your control – no external cloud service, no data sharing, no privacy trade-off.
Pro delivers:
✅ Private Machine Learning Human Spam Detection – Stops manually-typed spam that gets past basic filters, using Machine Learning that runs entirely on your own server and learns from your spam classifications – your visitors’ data never leaves your site or goes to a third party outside your control 
✅ Gravity Forms Integration – Complete protection for premium form users 
✅ WooCommerce Registration Blocking – Stop fake account spam 
✅ Email Quarantine – Review and rescue any legitimate messages caught by mistake 
✅ Quarantine / Audit Log – Full spam traceability: see every submission the plugin checks, allowed or blocked, and exactly why it was decided (bot trap, Machine Learning human-spam score, single-word, deny rule, real-time IP blocklist or allow list) – with the analysed content, masked IP and country, plus one-click allow/deny actions to fix any mistake 
✅ Custom Allow/Deny Rules – Block specific IPs, patterns, or keywords 
✅ IP Blocklist Checking – Automatic blocking of known spam networks 
✅ Priority Support – Get help directly from the developers
Perfect for: 
– High-traffic sites getting manually-entered spam 
– Agencies managing multiple client installations 
– Enterprise sites requiring advanced controls 
– Gravity Forms and WooCommerce users
<a href="https://fullworksplugins.com/products/anti-spam/" rel="nofollow ugc">Start Your Free 30-Day Pro Trial</a>
Try Pro features risk-free for 30 days. A card is required to start, but you won’t be charged if you cancel before the trial ends. No pressure, no hassle.

Anti-Spam Protection – No API Key, GDPR Friendly


I love that I don’t have to fight with this anymore. So simple. Can’t recommend enough.


It just works


Unlike Akismet which needs an API key and a whole load of limitations this one just works. And works really well. Highly recommended


I like pluigns like this

Block spam on Contact Form 7, WPForms & comments. No API key. GDPR compliant. Free for commercial use. No configuration needed.

NoCaptcha Spam Filter for Contact Form 7 vs Anti-Spam Protection – No API Key, GDPR Friendly