Free WordPress firewall, bot blocking, login protection, and malware scanning. See suspicious traffic and investigate threats from your dashboard.
Alternatives to Nullis Shield
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.
Security plugin blocking spam bots from harvesting email addresses, phone numbers & addresses. Dual-layer anti-spam protection with auto-detection.
Protect your site from malicious bots and scanners using a smart honeypot trap.
The most complete free WordPress anti-spam plugin. Protects Contact Form 7, comments, login, registration, REST API, and XML-RPC — all in one shield.
LC Anti-Spam Registrationv1.4.20
Prevent fake and automated bot registrations with lightweight honeypots, rate limiting, and intelligent username analysis.
CB Bot Guardv1.0.0
Stop spam bots, scrapers and request floods before they load WordPress and WooCommerce, and cut server RAM and CPU spikes.
Aystat Honeypot Adminv1.0.0
A secure honeypot to trap bots and malicious actors by faking an admin login page.
Lightweight, behavior-based bot firewall. Blocks scanners before WordPress loads, with text attack reports for your hosting company.
Blocks VPNs, proxies, Tor, datacenter IPs and bad bots. Plus firewall, login protection and country blocking. Free plan, no card needed.
A simple and lightweight yet rock-solid plugin that blocks comment spam using multiple automatic detection methods.