Invisible Anti-Spam & CAPTCHA icon
Invisible Anti-Spam & CAPTCHA icon

Invisible Anti-Spam & CAPTCHA

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The visitor's browser silently solves a small proof-of-work challenge in a few milliseconds. Humans never see a CAPTCHA, while spam bots either fail or have to pay in computing power.

Settings at a glance: protection status, topic tabs and built-in help for every option

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  • Wordpress
Message inbox: real submissions and spam side by side
Direct analysis mode: teach the spam check a new form with one click on the live page
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Every option explained in place
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Invisible Anti-Spam & CAPTCHA was added to AlternativeTo by MatthiasNordwig on and this page was last updated .

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What is Invisible Anti-Spam & CAPTCHA?

The visitor's browser silently solves a small proof-of-work challenge in a few milliseconds. Humans never see a CAPTCHA, while spam bots either fail or have to pay in computing power.

Everything runs on your own server: no account, no API keys, no third-party scripts, no cookies, and IP addresses are stored only as hashes, so no consent banner is needed.

Protects WordPress logins, registrations and comments, WooCommerce, and 60+ form builders out of the box (Contact Form 7, Elementor Pro Forms, WPForms, Gravity Forms, Ninja Forms, Fluent Forms and more). Hand-coded or custom forms can be added in one click via a live analysis mode.