A simple and lightweight yet rock-solid plugin that blocks comment spam using multiple automatic detection methods.
Alternatives to WhoKnew Shield — Email, Phone & Address Security
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.
Reliable WordPress email delivery with multiple providers, two connections, Return Path, Reply-To and visual AND/OR routing.
A CAPTCHA alternative with no puzzle. Stops fake signups, spam registrations, form spam and card-testing bots, plus VPN, proxy and Tor traffic.
Protect your site from malicious bots and scanners using a smart honeypot trap.
LeadShieldv1.0.0
Blocks fake, bot and AI-generated form submissions in real time — before they reach your inbox or CRM. No CAPTCHA. Free plan available.
Modular dual-layer anti-spam protection for WordPress forms and comments with custom TLD and email filtering.
Protect your forms from spam with 99.9% accuracy - no CAPTCHA, no JavaScript, no tracking. Trusted by 3.5M+ websites.
The most complete free WordPress anti-spam plugin. Protects Contact Form 7, comments, login, registration, REST API, and XML-RPC — all in one shield.
Nullis Shieldv1.3.1
A Prevention-First security engine that eliminates bots before they hit your database. Lightweight, zero-bloat, and incredibly fast.
Anti-spam and scam protection for private messages in Better Messages: rate limits, contact filters, bot detection and safety warnings.