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.
High-performance client-side anti-bot protection and Proof-of-Work challenge verification for WordPress without third-party CAPTCHA.
Stop comment spam, fake registrations and form bots with invisible behavioral verification — no puzzles, no checkboxes, zero PII.
Antispam Beev2.11.13
Sophisticated antispam plugin for effective daily comment and trackback spam-fighting. Built with data protection and privacy in mind.
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.