Privacy-first, Proof of Work captcha for WordPress. No image puzzles, no tracking. 22+ integrations included.
Alternatives to Cardea – Proof-of-Work Comment Spam Protection
Plugins below are selected for functional relevance and current directory signals. Active-install counts do not affect this ranking.
Relevant replacements
WordPress plugins with similar use cases
Compatibility and update metadata provide context, not a quality guarantee. Review each plugin’s details for your site.
Privacy CAPTCHA for Capv1.6.2
Privacy-friendly spam protection for comments, login, registration, WooCommerce, and Gravity Forms, powered by your own Cap server.
A simple and lightweight yet rock-solid plugin that blocks comment spam using multiple automatic detection methods.
Auto-discard comment spam before it ever hits your database. Zero-Touch protection — no API keys, no external calls,
Invisible Proof-of-Work CAPTCHA. No checkboxes, no image grids, no Google, no tracking. Just spam protection that gets out of the way.
GateCHA CAPTCHAv1.5.0
Self-hosted ALTCHA proof-of-work CAPTCHA via GateCHA. Protects WordPress forms without cookies, fingerprinting, or third-party services.
Block spam in Elementor, Contact Form 7, JetFormBuilder, Ninja Forms, WooCommerce and comments with keyword, link and email checks.
Stop comment spam, fake registrations and form bots with invisible behavioral verification — no puzzles, no checkboxes, zero PII.
High-performance client-side anti-bot protection and Proof-of-Work challenge verification for WordPress without third-party CAPTCHA.
Antispam Beev2.11.13
Sophisticated antispam plugin for effective daily comment and trackback spam-fighting. Built with data protection and privacy in mind.