andreyberestov

Berestov Anti-spam for Contact Form 7 adds a lightweight, privacy-friendly anti-spam layer without modifying Contact Form 7 core files.
Features:
<ul>
<li>Layered anti-spam protection designed for real-world form traffic.</li>
<li>Fresh protection data can be refreshed on rendered forms, which helps on cached pages.</li>
<li>Front-end assets load only where protected forms are present.</li>
<li>Optional diagnostic logging to the plugin log file.</li>
<li>Built-in statistics for allowed and blocked requests.</li>
<li>Optional WordPress comment protection module.</li>
</ul>

Berestov Anti-spam for Contact Form 7

Protect Contact Form 7 and optionally WordPress comments with privacy-friendly anti-spam protection.

Yevhen Horbyshyn

This plugin adds a hidden “inverted” checkbox to your forms to prevent bots from submitting them.
<ul>
<li>Adds support for Contact Form 7 via shortcode <code>[ica_checkbox]</code></li>
<li>Adds JavaScript-based hidden checkbox to regular forms in the footer</li>
<li>Blocks form submission if the checkbox is unchecked or missing (typical behavior for bots)</li>
</ul>

Inverted Checkbox Antispam

Simple spam protection using an inverted checkbox. Compatible with Contact Form 7 and custom HTML forms.

Berestov Anti-spam for Contact Form 7 vs Inverted Checkbox Antispam